WTR-HSW-009 Full Course Draft

Glass Door Systems & Modern Frameless Hardware: Specification & Safety

AIA CES Provider: #40115764

Course Code: WTR-HSW-009

Credit: 1.0 LU/HSW

Format: 12 Slides + 3 Interactive Elements + 10-Question Post-Test

Pass Rate: 80% (8/10 required)

Writer A Draft — Generated 2026-04-28

SLIDE 1 — Title & Disclosure

Slide Title

Glass Door Systems & Modern Frameless Hardware: Specification & Safety

A 1.0 LU/HSW Course from Waterson USA — AIA CES Provider #40115764

Mandatory Disclosure

"This course is presented by Waterson USA, a manufacturer of architectural door hardware including hydraulic hinge-closers for glass doors. Content covers industry-wide standards and products from multiple manufacturers including dormakaba, GEZE, C.R. Laurence, Rixson, and Waterson. Waterson-specific product content represents approximately 15% of total course material. This course does not constitute professional engineering advice. Attendees should verify all specifications against applicable codes and consult a licensed professional."

Learning Objectives

By the end of this course, participants will be able to:

1. (Remember/Understand — Bloom Level 1–2) Identify and distinguish among the four primary glass door system types — frameless, semi-frameless, framed, and storefront — and explain when each is appropriate for a given project program and code context. (Addressed in Slides 2–3: system type descriptions and use-case table)

2. (Analyze — Bloom Level 4) Evaluate glass door hardware options including patch fittings, pivot hinges, glass-to-glass hinges, and floor springs against structural load, accessibility, and fire-rating requirements, selecting the appropriate hardware for a given site condition. (Addressed in Slides 3–4: hardware vocabulary and scenario-matching interactive)

3. (Apply — Bloom Level 3) Apply UL 10C fire testing requirements, IBC glazing safety standards (IBC §2406, ANSI Z97.1, CPSC 16 CFR Part 1201), and emergency egress provisions (IBC §1010) when specifying fire-rated glass door assemblies, identifying specification errors and their code basis. (Addressed in Slides 5–8: fire code, safety code, and interactive error-identification exercises)

4. (Create — Bloom Level 6) Write Division 08 specification language for glass door hardware that incorporates appropriate product designations, safety glazing requirements, and self-closing compliance, including coordination notes between hardware and glazing contractors. (Addressed in Slides 9–12: concealed hardware, hydraulic performance, and sample spec language)

Bloom Taxonomy alignment note: Course content progression — Slides 2–3 (recall and identification), Slides 4–8 (analysis and application through interactive exercises), Slides 9–12 (synthesis through specification writing) — is designed to match the claimed cognitive levels. The interactive elements at Slides 4, 6, and 8 are calibrated to the Analyze and Apply levels. The Slide 12 specification language exercise targets the Create level.

Narration Text

Glass doors create a specification paradox. Clients want them everywhere — hotel lobbies, office entries, healthcare reception, luxury multifamily corridors. But the hardware that makes a frameless glass door perform is fundamentally different from traditional butt-hinge-and-closer specifications. Most architects encounter glass door hardware through trial and error in the field. This course eliminates that gap before it reaches the contractor.

Over the next 12 slides, we will cover what glass door systems exist, what hardware makes them structurally sound, and what codes govern their safety in commercial occupancies. Our goal is that you leave this course feeling equipped — not uncertain — when you next specify a frameless glass door system.

Sources: UL 10C; IBC Chapter 24; NFPA 80 (current edition)

SLIDE 2 — Glass Doors in Commercial Architecture: Types and Use Cases

Slide Title

Four System Types — Which One Belongs on Your Project?

Key Content

Why System Type Determines Hardware Selection

The structural role of the door frame — or its absence — dictates which hardware categories are even physically possible:

• Frameless doors have no frame to absorb hinge load. All forces transfer directly to the glass through patch fittings or pivot assemblies. Minimum glass thickness is 3/4 inch (19 mm) tempered for structural adequacy under ASTM load criteria.
• Semi-frameless doors gain structural relief from a top rail, which also provides a mounting channel for overhead concealed closers. The glass panel no longer carries the full bending load at the hinge point.
• Framed and storefront doors allow conventional butt hinge or continuous hinge specifications. Surface-mounted overhead closers attach to the frame header — no coordination with the glass itself is required.
• Fire-rated frameless glass requires fire-rated ceramic glass (e.g., Pilkington Pyroswiss, NSG Pyrobel). Standard tempered float glass has no fire rating. This distinction eliminates many "minimalist" glass specifications at fire-rated openings.

Narration Text

The system type is the first specification decision on every glass door project — because it determines what hardware is physically possible and what codes apply. Architects frequently specify the visual look — frameless, minimal, all-glass — without identifying how the hardware makes it work. The frameless all-glass door is the most demanding specification challenge: there is no frame to carry load, no frame to mount a closer arm, and no frame header to gasket against smoke.

Notice the asymmetry in fire-rated applications: a framed glass door can use wired glass at a 20-minute rating in legacy conditions, while a frameless all-glass door at any fire-rated opening must use fire-rated ceramic glass throughout. The glass type and the system type are inextricable at fire-rated openings.

Sources: IBC Chapter 24 — Glass and Glazing; IBC Table 716.6 — Fire-rated Glazing; ASTM C 1048 — Tempered Glass

SLIDE 3 — Hardware for Frameless and Semi-Frameless Glass Doors

Slide Title

The Hardware Vocabulary: Patch Fittings, Pivots, Floor Springs, and Glass-to-Glass Hinges

Key Content

#### Patch Fittings

Stainless steel clamp-style fittings that attach directly to the glass edge without drilling through the glass face. The fitting wraps the glass corner, compresses against both faces, and transfers load through friction and clamping force.

• Available in single-action (one-way swing) and double-action (bi-directional swing) configurations
• Structural requirement: glass must be 3/4" (19mm) tempered or laminated-tempered minimum
• Manufacturer examples: dormakaba Manet series, C.R. Laurence (CRL) architectural patch fittings, Waterson K51GG series

#### Pivot Hinges

Top and bottom pivots eliminate the offset bending moment created by side-hung butt hinges. The load path is direct: door weight compresses through the bottom pivot spindle to the floor structure.

• Floor pivot (bottom) absorbs the primary structural load — must be rated for full door weight including dynamic impact
• Available in concealed floor-spring integrated versions and exposed surface-visible types
• Pivot systems accommodate doors from standard commercial sizes up to 400 lbs+ per hinge set depending on manufacturer
• Manufacturer examples: Rixson concealed floor pivots, FritsJurgens integrated pivot systems

#### Glass-to-Glass Hinges

Connect a swinging glass door directly to an adjacent fixed glass panel (sidelight) without requiring a door frame or wall attachment on the hinge side.

• Both panels must be structurally engineered — the fixed panel must anchor the transferred hinge load into the floor and ceiling or structural frame
• Typical minimum glass: 3/4" (19mm) tempered on both door and fixed panel
• The Waterson K51GG is designed for this configuration, integrating hydraulic self-closing into the hinge body without a separate closer
• dormakaba Manet patch fittings also provide glass-to-glass pivot connections but require a separate closer

#### Floor Springs (Concealed Floor Closers)

Hydraulic mechanism concealed in a floor cassette; pivot spindle extends through the door bottom rail to carry the door weight and provide self-closing torque.

• Self-closing force and closing speed controlled by hydraulic adjustment; most provide hold-open function at 90° or 180°
• ADA consideration: opening force measured at the door edge pull handle — not at the spindle. The hydraulic spring force does not automatically guarantee ADA compliance at the door edge.
• Manufacturer examples: dormakaba BTS 75V/BTS 80, GEZE TS 500 NV, Rixson Model 27 floor closer

Narration Text

The hardware on a frameless glass door does structural work that a conventional door frame would normally perform. When you specify a glass-to-glass hinge, the fixed glass panel becomes a structural element — one that will carry transferred loads in all three axes. That coordination belongs with the structural engineer or glazing consultant, not in a site meeting after the glass is installed.

Floor springs deserve particular emphasis in new construction: the floor cassette must be coordinated before the concrete slab is poured. Once the slab is down, a concealed floor spring becomes a saw-cut and core-drill operation. That coordination decision happens during design development — not during construction documents.

The cost of missing this coordination: A floor cassette blockout specified during design costs approximately $200–$400 in formwork coordination. Adding a floor spring after the slab is poured — saw-cutting concrete, core-drilling for the cassette, repairing the surrounding slab — typically costs $1,500–$4,000 per opening in a commercial building, plus 2–4 weeks of schedule impact for curing and inspection. On a 10-door lobby project, that is a $30,000–$40,000 change order and a month of schedule delay — for a decision that should have been made during design development. Some contractors may also require structural engineering sign-off on the saw-cut, adding further time and cost.

Sources: ASTM C 1048 — Tempered Glass; dormakaba BTS Series Technical Data; GEZE TS 500 NV Installation Manual; Rixson Floor Closer Product Guide; RSMeans commercial construction cost data (concrete saw-cutting and core-drilling, 2024)

SLIDE 4 — INTERACTIVE ELEMENT 1: Matching Hardware to Glass Door System Type

[INTERACTIVE — Scenario Matching: Select the Correct Hardware for Each Project]

Title: Hardware Selection — Which Fitting for Which System?

Format: Four project scenarios displayed sequentially. For each scenario, the learner selects the correct hardware configuration from four options. Immediate feedback with explanation is provided after each selection.

Estimated completion time: 4–5 minutes | Slide timing position: ~15 minutes into course

#### Scenario A

Hotel lobby: All-glass frameless double doors, 8'0" × 3'6" each leaf, approximately 200 lbs per leaf. No visible framing desired. Polished concrete floor. No wall on the hinge side — fixed glass sidelight present.

Options:

• A) Standard butt hinges on a concealed steel channel welded to the sidelight frame
• B) Surface-mounted overhead closer arms attached to the top edge of the glass
• C) Concealed floor spring with top pivot; glass-to-glass pivot hinge connecting door to sidelight ← Correct
• D) Magnetic latch only — the door weight is carried by the glass alone

Feedback (Correct):

Floor springs conceal the entire closing mechanism in the floor cassette, and the top pivot provides door alignment without surface hardware. The glass-to-glass pivot transfers hinge load to the fixed sidelight panel, which must be structurally anchored. This is the standard configuration for heavy frameless lobby doors.

Feedback (Incorrect):

Option A places concealed steel in the sidelight, introducing a hidden structural element that disrupts the all-glass appearance and requires structural engineering coordination. Option B is not technically feasible — there is no frame header to mount a closer arm. Option D has no self-closing mechanism; most commercial occupancies require self-closing doors on egress paths.

#### Scenario B

Office entry: Glass door attached to a fixed glass sidelight panel. No wall on the hinge side. Standard commercial size, 84" × 36", approximately 100 lbs.

Options:

• A) Floor pivot only — no connection to the sidelight glass needed
• B) Glass-to-glass hinge (e.g., Waterson K51GG or dormakaba Manet) connecting door to sidelight ← Correct
• C) Surface-mounted butt hinge anchored to the glass edge with adhesive
• D) Overhead closer with arm mounted to the glass surface

Feedback (Correct):

Glass-to-glass hinges are the correct specification when no wall or frame is available on the hinge side. The sidelight must be designed as a structural element — it transfers the full hinge load (door weight plus dynamic forces) into the floor and ceiling connections. The glazing consultant must confirm structural adequacy of the fixed panel before finalizing this specification.

Feedback (Incorrect):

A floor pivot alone only handles the bottom pivot point and closing mechanism — you still need a top connection and a hinge connection to the adjacent structure, which requires the glass-to-glass hinge. Options C and D are not code-compliant structural solutions for a commercial door.

#### Scenario C

Healthcare reception entry: Semi-frameless sliding glass door on an ADA accessible route, 7'0" × 3'8".

Options:

• A) Heavy-duty floor spring with hydraulic adjustment tuned to 5 lbs at door edge
• B) Glass-to-glass hinge with ADA-compliant opening force
• C) Automatic sliding door operator (ANSI/BHMA A156.19) with patch-fitting door stop ← Correct
• D) Concealed overhead closer in the top rail, adjusted to minimum spring force

Feedback (Correct):

ADA accessible routes require maximum 5 lbs interior door opening force per ICC A117.1 §404.2.8. On a swinging door, this conflicts with the closing force required to reliably latch a fire door. Automatic sliding operators eliminate this conflict entirely — the door is motorized, so opening force at the user is near zero. Patch fittings at the door stop location only; no hinge is needed. This is the standard resolution for accessible-route entries in healthcare.

Feedback (Incorrect):

Tuning a floor spring to 5 lbs at the door edge while maintaining reliable self-closing is extremely difficult in practice, especially as hydraulic seals wear over time. Automatic operators are the preferred engineering solution for ADA accessible primary entries in high-traffic healthcare settings.

#### Scenario D

Retail storefront: Framed aluminum glass door, self-closing required by occupancy, 7'0" × 3'0", aluminum frame header available.

Options:

• A) Concealed floor spring — most aesthetically clean solution
• B) Glass-to-glass hinge — connects door to fixed aluminum sidelight
• C) Overhead pivot system with floor cassette
• D) Surface-mounted hydraulic door closer on frame header with standard arm bracket ← Correct

Feedback (Correct):

The aluminum frame provides the attachment surface for a standard closer arm-and-head-plate bracket. This is the lowest-cost, most reliable, and code-compliant solution for a framed storefront system. Concealed floor springs on retail storefront entries are unnecessary — the framed system doesn't require concealment, and the floor cassette adds significant coordination cost and slab penetration risk.

Feedback (Incorrect):

Floor springs are best suited to frameless or minimal-hardware applications where the aesthetic benefit justifies the coordination cost. On a framed aluminum storefront door, a surface-mounted closer is the standard specification — using a floor spring here adds cost without design benefit.

Narration Text

Hardware selection begins with system type, then adds load requirements, code requirements, and aesthetic priorities — in that order. The four scenarios here cover the configurations architects encounter most frequently. Notice the pattern in Scenario C: ADA accessible routes often resolve the self-closing vs. 5-lbs-force conflict by switching to automatic operators rather than attempting to tune manual hardware to an acceptable range. That resolution needs to happen in design development — not at the permit review.

Sources: ICC A117.1 §404.2.8 — Door Opening Force; ANSI/BHMA A156.19 — Power Assisted and Low Energy Power Operated Doors; dormakaba BTS Series Technical Data; GEZE TS 500 NV Product Guide

SLIDE 5 — Fire-Rated Glass Doors: UL 10C and the Testing Baseline

Slide Title

UL 10C — The Test That Governs Every Fire-Rated Glass Door in the U.S.

Key Content

#### What UL 10C Tests

UL 10C is the standard test for positive pressure fire door assemblies — the dominant test method for commercial swinging doors in U.S. construction since NFPA 80 adopted positive pressure requirements in 2005.

The test subjects a complete door assembly — door leaf, frame, all hardware, glazing, and seals — to a furnace at temperatures exceeding 1,700°F for the rated duration.

Positive pressure means air pressure is maintained on the furnace side, simulating real fire conditions where hot combustion gases push outward against the door. Earlier negative-pressure tests (UL 10B) allowed doors to remain closed by suction — UL 10C removes this advantage and tests against actual fire gas dynamics.

Pass criteria:

• Door must not fail structurally during rated duration
• No flame transmission through assembly joints
• Survives post-fire hose-stream test — pressurized water spray immediately after furnace exposure without shattering or allowing hose penetration

#### Fire Ratings and Glass Types Permitted

Sources: IBC Table 716.6 — Fire Window and Door Assemblies; NFPA 80 §4.1

#### Wired Glass vs. Fire-Rated Ceramic Glass

Wired glass (legacy product):

• Steel wire mesh embedded in glass during manufacturing
• Permitted only in legacy 20-minute openings in limited conditions
• Maximum glazed area: typically 100 sq. in. per NFPA 80 for older code editions (newer editions restrict further)
• Critical deficiency: Wired glass does NOT meet CPSC 16 CFR Part 1201 Category II impact safety standard
• Cannot be used in hazardous locations (glass doors and adjacent panels within 60 inches of the floor and within 24 inches of a door edge) regardless of fire rating
• Code interpretation: wired glass in a fire-rated door location that is also a hazardous location = code violation on two simultaneous requirements

Fire-rated ceramic glass (current standard):

• No wire mesh — monolithic ceramic glazing product with fire-resistant properties embedded in the glass matrix
• Passes both fire-rating test (UL 10C) AND safety glazing test (CPSC 16 CFR Part 1201 / ANSI Z97.1 Class A) simultaneously
• Available in ratings from 20 minutes to 90 minutes with no size restriction beyond the tested assembly dimensions
• Manufacturer examples: Pilkington Pyroswiss, NSG Pyrobel, Vetrotech Saint-Gobain

#### NFPA 80 Hardware Requirements for Fire-Rated Glass Doors

NFPA 80 requires that every component of a listed fire door assembly carry its own individual UL listing mark. The door label alone does not certify the hardware:

• Hinges, pivots, and patch fittings: individually listed
• Self-closing device (floor spring, hinge-closer, overhead closer): individually listed for UL 10C
• Latch and strike: individually listed for positive-pressure fire use
• Each component must be part of the same tested assembly on file with UL

For frameless glass doors: each patch fitting and pivot must be part of the tested and listed assembly. A custom patch fitting not in the UL file invalidates the listing.

Narration Text

This is where the aesthetic and the code collide — and where the architect's specification work either protects the owner or exposes them to liability. A beautiful frameless glass fire door is achievable. But every fitting, hinge, closing mechanism, and latch must be listed for the specific tested assembly on file with UL. If a client requests a custom patch fitting not in the tested UL file, that door cannot bear the fire label. The label lives or dies with the assembly, not with the individual product.

The distinction between wired glass and fire-rated ceramic glass is not a performance nuance — it is a code requirement that changed building construction practice. Wired glass fails the impact safety standard required at hazardous locations. In a door opening — a location that is by definition a hazardous location under IBC §2406 — wired glass cannot be used except in narrow legacy conditions at 20 minutes. If your project requires fire-rated glass in any door at 45 minutes or above, the specification is ceramic glass. Period.

Sources: UL 10C — Positive Pressure Fire Tests of Door Assemblies; NFPA 80 §4.1, §5.2; IBC Table 716.6; IBC §2406.4 — Hazardous Locations; CPSC 16 CFR Part 1201

SLIDE 6 — INTERACTIVE ELEMENT 2: Fire-Rated Glass Door Specification Errors

[INTERACTIVE — "Spot the Specification Error": Identify Four Errors in a Hardware Set]

Title: Fire-Rated Glass Door Hardware Set — Find the Errors

Format: A complete specification hardware set is displayed on screen. Learners are asked to identify four errors by clicking or selecting problem items. After each selection (or after all four are attempted), a correction panel displays the correct specification. The learner must identify all four errors to advance.

Estimated completion time: 5–6 minutes | Slide timing position: ~25 minutes into course

#### The Hardware Set to Review

HARDWARE SET 7B — 60-min fire-rated glass door, single leaf

Door leaf:   3/4" wired glass, full-vision, 7'0" × 3'6"
             Note: "Full vision for reception area transparency"

Hinges:      (3) continuous glass-to-glass hinges, brushed stainless
             "Unrated — decorative stainless finish"

Closer:      (1) Concealed floor spring, hydraulic, adjustable
             "No UL listing number on cut sheet"

Latch:       Magnetic latch, electronic hold-open
             "No UL listing noted; latch releases on fire alarm"

Note:        "Fire-rated glass door per IBC; full-vision wired glass
             acceptable for 60-minute opening to match existing"

#### The Four Errors

Error 1 — Glass Type

• Incorrect specification: Wired glass, 3/4", full-vision, 60-minute opening
• Why this fails: Wired glass is NOT permitted at 60-minute fire-rated openings. Per IBC Table 716.6, 60-minute openings require fire-rated ceramic glass. Wired glass is limited to 20-minute legacy conditions only. Additionally, wired glass fails CPSC 16 CFR Part 1201 Category II impact safety requirements at door hazardous locations — making this a dual violation.
• Correction: Specify fire-rated ceramic glass (e.g., Pilkington Pyroswiss, NSG Pyrobel, or equal) as part of a complete UL 10C tested assembly for a 60-minute rating.

Error 2 — Unrated Hinge/Fitting on Fire Assembly

• Incorrect specification: "Unrated — decorative stainless finish" on hinges/fittings
• Why this fails: Per NFPA 80, every hardware component in a fire-rated assembly must be individually UL-listed as part of the same tested assembly. "Unrated" hinges or glass-to-glass fittings are not permitted on any fire-rated opening regardless of material quality.
• Correction: Specify UL-listed pivot hinges or glass fittings that appear in the manufacturer's UL file for the tested 60-minute assembly.

Error 3 — Floor Spring Without UL Listing

• Incorrect specification: Concealed floor spring with no UL listing noted
• Why this fails: The self-closing device must carry a UL listing mark for positive pressure fire door assemblies per UL 10C. A floor spring without a UL listing on a fire-rated assembly means the door assembly is not fully listed, invalidating the door label.
• Correction: Specify a UL-listed hydraulic floor spring (e.g., dormakaba BTS 75V with UL listing, or GEZE TS 500 NV with appropriate listing). The specification must reference the UL listing mark.

Error 4 — Magnetic Latch Without Listed Positive-Latching Compliance

• Incorrect specification: Magnetic latch, no UL listing, releases on fire alarm
• Why this fails: NFPA 80 §5.2.1.2(9) requires positive latching — the latch must mechanically engage the strike without assistance and hold the door positively closed. Magnetic latches must be individually UL-listed for fire door use AND must provide positive latching as a primary function, not simply hold-open release. A magnetic latch that is not listed fails both requirements.
• Correction: Specify a UL-listed electric strike with mechanical positive-latching bolt, or a UL-listed magnetic latch specifically tested and listed for fire door use in a positive-pressure assembly.

#### Post-Interactive Correction Panel

CORRECTED HARDWARE SET 7B — 60-min fire-rated glass door

Door leaf:   Fire-rated ceramic glass, full-vision
             (e.g., Pilkington Pyroswiss or NSG Pyrobel)
             7'0" × 3'6", UL-listed 60-min assembly
             Meets CPSC 16 CFR Part 1201 and ANSI Z97.1 Class A

Hinges:      UL-listed pivot hinges or patch fittings, part of tested
             assembly per manufacturer's UL file (confirm listing number)
             Material: 316 stainless steel, finish as scheduled

Closer:      UL-listed concealed floor spring, hydraulic
             (e.g., dormakaba BTS 75V or GEZE TS 500 NV)
             UL 10C listed for positive-pressure assembly; listing mark
             must appear on product and specification

Latch:       UL-listed electric strike with mechanical positive-latching
             bolt per NFPA 80 §5.2.1.2(9)
             OR UL-listed magnetic latch tested and listed for fire door
             use in positive-pressure assemblies

Narration Text

The most dangerous error in this hardware set is the glass type. An architect who specifies wired glass for a 60-minute fire-rated opening has created a code violation that an AHJ should reject at plan review — but if it reaches installation, the building owner has an uncertifiable fire door assembly that must be completely removed and replaced. The correction is not a field adjustment; it is a full assembly replacement.

The second most consequential error is the unrated hardware. The fire door label certifies the entire tested assembly. Substituting any unlisted component — even a beautiful custom stainless fitting — voids the label. The practical protection for architects is simple: when specifying glass fire door hardware, require the hardware contractor to submit the UL file number for each component and confirm it matches the tested assembly. That single submittal requirement catches all four errors in this set.

Sources: UL 10C — Positive Pressure Fire Tests of Door Assemblies; NFPA 80 §5.2.1.2(9); IBC Table 716.6; CPSC 16 CFR Part 1201; ANSI Z97.1 — Safety Glazing Performance

SLIDE 7 — Safety Code Requirements: Tempered Glass, Egress, and Pinch Points

Slide Title

Three Safety Codes Every Glass Door Specification Must Satisfy Simultaneously

Key Content

#### 1. Safety Glazing — CPSC 16 CFR Part 1201 & ANSI Z97.1

All glass in doors and adjacent hazardous locations must be safety glazing — tempered or laminated-tempered — throughout the full door height and panel width.

Hazardous locations per IBC §2406.4 include:

• Any glass in a door leaf — always required
• Fixed glazed panels within 24 inches of a door edge
• Fixed glazed panels from the floor to 60 inches above finished floor adjacent to a door

Impact test requirement:

• CPSC 16 CFR Part 1201 Category II: 400 lb-ft bag drop from 48 inches — required for all glass doors in commercial occupancies
• ANSI Z97.1 Class A: equivalent standard; both are acceptable under IBC
• Wired glass fails Category II — it cannot be used in hazardous locations regardless of fire rating

Quick Reference — When Safety Glazing Is Required:

#### 2. Emergency Egress — IBC Chapter 10 & NFPA 101

Glass doors on egress paths must comply with all IBC §1010 provisions:

• Single hardware operation: IBC §1010.1.9 — egress doors must operate with one motion; no simultaneous multi-step operation, no key required from egress side
• Opening force:
• Maximum 30 lbs to set the door in motion
• Maximum 15 lbs to swing the door to full open travel (fire-rated egress doors per IBC §1010.1.3)
• ADA accessible routes: maximum 5 lbs per ICC A117.1 §404.2.8 — this is the binding limit on accessible routes, more restrictive than IBC egress
• Panic hardware (IBC §1010.2.9): Required at egress doors serving Assembly (Group A) or Educational (Group E) occupancies with occupant loads of 50 or more, and High Hazard (Group H) occupancies regardless of load
• Frameless glass doors on egress paths: Pull handle minimum 10 inches long, easily graspable without tight grip, pinching, or twisting

#### 3. Pinch Points — ADA and ICC A117.1 §404.2.7

Doors in motion create pinch and shear hazards at the pivot or hinge side. This is particularly acute on heavy glass doors with hydraulic closers that generate significant closing torque.

• ADA requires: no pinch or shear hazard at hardware edges on any door in an accessible route
• Glass-to-glass hinge configurations: the hinge body projects from the glass surface — verify that the hinge profile does not create a projecting hazard at body height (typically 15"–48" AFF per ICC A117.1)
• Hydraulic hinge-closers that integrate closing function into the hinge body (e.g., Waterson K51GG, K51GWL; FritsJurgens integrated pivot) eliminate the separate overhead arm — reducing the pinch zone at the door header
• dormakaba and GEZE concealed track-arm closers maintain the overhead track as a potential pinch surface — verify track profile clearance against door frame edge

Narration Text

These three requirements can conflict — and they must be resolved simultaneously in the same door assembly. Consider a frameless all-glass door on an egress path with a fixed sidelight in a 200-person restaurant. That single door must simultaneously: use tempered or fire-rated ceramic glass in the leaf and the sidelight within 24 inches of the door edge, be operable with one motion at no more than 5 lbs on the accessible route, have panic hardware because the occupancy exceeds 49 persons, and not create a pinch hazard at the hinge connection. Resolving all four at once requires hardware selection to happen during design development — not during permit review, and certainly not as a field change.

Sources: IBC §2406.4 — Hazardous Locations; IBC §1010 — Doors, Gates, and Turnstiles; IBC §1010.2.9 — Panic and Fire Exit Hardware; ICC A117.1 §404.2.7–§404.2.8; CPSC 16 CFR Part 1201; ANSI Z97.1; NFPA 101 §7.2.1

SLIDE 8 — INTERACTIVE ELEMENT 3: Egress and Safety Compliance Scenario

[INTERACTIVE — Scenario Analysis: The High-Traffic Restaurant Entry]

Title: The High-Traffic Restaurant Entry — Can It Pass Code?

Format: A project scenario is displayed. Two sequential multiple-choice questions follow. Feedback is provided after each answer. A synthesis summary panel displays at the end.

Estimated completion time: 4–5 minutes | Slide timing position: ~35 minutes into course

#### Scenario Setup

A 200-person restaurant is designed with a frameless all-glass entry: double swinging doors, 8'0" × 3'6" each leaf, with fixed glass sidelights flush to the door edge on both sides. The doors are on the primary egress path. The design team specifies:

>

- Patch fittings at all four corners of each door leaf

- Magnetic latch with electric hold-open, releases on fire alarm

- Overhead surface-mounted closers on visible arms, mounted to a minimal steel header concealed above the ceiling plane

- Pull handles, 8 inches long, on both sides

- The closers are adjusted to hold-open at 90° and close softly at approximately 18 lbs force at door edge, 5-second sweep to latch

#### Question 1

Does this design require panic hardware?

• A) No — glass doors are exempt from panic hardware requirements because they are transparent
• B) No — the pull handles satisfy single-action operation and no latch is used
• C) Yes — a 200-person occupancy in an Assembly (Group A) occupancy on the egress path exceeds the 49-person threshold; panic hardware is required on at least one leaf ← Correct
• D) Only if the building is classified Group H (High Hazard)

Feedback (Correct):

IBC §1010.2.9 requires panic hardware on egress doors serving Assembly (Group A) occupancies with an occupant load of 50 or more. A 200-person restaurant is clearly a Group A occupancy well over that threshold. The transparency of the glass is irrelevant to the panic hardware requirement. Pull handles do not substitute for panic hardware when the code requires it — panic hardware must be installed on a latch and provide unlatching with a single motion in the direction of egress travel. At least one of the double doors must meet this requirement.

Feedback (Incorrect — Option A): Glass material does not determine panic hardware requirements. Occupancy type and occupant load govern this requirement regardless of door material.

Feedback (Incorrect — Option B): Single-action operation is required but is not sufficient to eliminate the panic hardware requirement. If the door latches (which fire-rated doors must do), that latch must be releasable by panic hardware.

#### Question 2

The overhead closer produces 18 lbs of opening force at the door edge. Does this door comply with IBC force limits?

• A) Yes — 18 lbs is well below the IBC limit, so no issues
• B) Yes — the IBC allows 30 lbs on egress doors and 18 lbs is under that limit
• C) No — on an accessible egress route, ICC A117.1 §404.2.8 limits interior door opening force to 5 lbs; 18 lbs exceeds this limit and renders the door non-compliant on the accessible route ← Correct
• D) Opening force limits apply only to mechanical room doors, not restaurant entries

Feedback (Correct):

IBC §1010.1.3 sets a maximum of 30 lbs to set the door in motion and 15 lbs to swing to full travel for fire-rated egress doors. However, ICC A117.1 §404.2.8 imposes a 5 lbs maximum at all interior accessible doors — and this accessible route standard is the more restrictive binding requirement on a public restaurant entry. At 18 lbs, this door fails the accessible route standard. The practical solution for a high-traffic restaurant entry on an accessible route is an automatic door operator that eliminates the force conflict entirely, or a significantly reduced spring setting verified to hold 5 lbs over time.

Feedback (Incorrect — Options A, B): The IBC egress force limit (30 lbs / 15 lbs) is not the only applicable standard. When the door is on an ADA accessible route, ICC A117.1's 5 lbs limit is more restrictive and applies.

#### Synthesis Summary Panel

This design has three issues requiring resolution in design development:

>

1. Panic hardware required — Group A occupancy, 200 persons. At least one leaf needs UL-listed fire exit hardware or panic hardware per IBC §1010.2.9.

2. Opening force non-compliant — 18 lbs exceeds the 5 lbs ICC A117.1 accessible route limit. Recommend automatic door operator for this configuration.

3. Pull handle length — current specification shows 8-inch handles; IBC recommends 10-inch minimum for frameless glass egress doors to ensure a full-hand grip without twisting.

>

All three issues are resolvable — but they require decisions during design development, not after the glass is fabricated and the frame is installed.

Narration Text

This scenario illustrates the core lesson of the egress section: the glass door hardware specification must happen simultaneously with the occupancy analysis, the accessible route determination, and the fire rating assessment. When all three arrive at the construction document stage without resolution, the result is change orders, permit delays, and glass that must be recut to accept different hardware.

The automatic door operator is worth mentioning specifically: for high-occupancy ADA primary entries, it is often the correct engineering solution — not a workaround. An automatically operated entry door satisfies ADA force requirements, eliminates the panic hardware conflict on the active leaf, and provides a premium user experience for a 200-person restaurant. The cost of the operator is often less than the change order cost of reworking a manual door assembly that fails permit.

Sources: IBC §1010.2.9 — Panic and Fire Exit Hardware; ICC A117.1 §404.2.8 — Door Opening Force; IBC §1010.1.3 — Door Operations; ANSI/BHMA A156.19 — Power Operated Doors; NFPA 101 §7.2.1.4

SLIDE 9 — Modern Architectural Trends: Concealed Hardware and Minimal Profiles

Slide Title

The Design Demand: Zero Visible Hardware on Glass Doors

Key Content

#### Why Concealed Hardware Has Become the Commercial Design Standard

The trend toward concealed hardware in glass door systems is not aesthetic preference — it reflects a fundamental shift in how architects treat the glass plane as a design element:

• High-profile commercial projects in hospitality, corporate, and luxury multifamily now routinely specify zero visible hardware as a program requirement, not an upgrade
• Healthcare clients rank concealed hardware as a hygiene benefit: surface-mounted closer arms and exposed hinge bodies collect particulates and complicate cleaning protocols
• Glass curtain wall and full-height glazing systems have trained building users to perceive uninterrupted glass as the design baseline — any hardware visible on a glass door reads as a flaw against that background
• Premium projects use concealed hardware as a design quality signal at entry: the lobby with all-glass concealed doors communicates precision detailing from first contact

#### Concealed Hardware Options for Glass Doors

#### The Integrated Hinge-Closer Approach

One category of hardware collapses the hinge and the closing mechanism into a single body, eliminating the overhead arm entirely:

• Waterson K51GG / K51GWL — hydraulic fluid in the hinge barrel provides closing torque through pivot rotation; closing speed and hold-open adjustable via set screws on the hinge body; UL fire-rated versions available; ADA-compliant opening force (5 lbs at door edge); 316 stainless steel standard
• FritsJurgens System 3 Pivot — concealed pivot with integrated closing function; rated to 440 lbs; no visible hardware from either face; ceiling and floor anchored; used on very heavy single-glass doors
• Note: Integrated hinge-closers are one solution among several — architects should evaluate all concealed options against their project's structural, code, and budget requirements

#### Other Manufacturer Concealed Solutions

• dormakaba ITS 96 BCA: Concealed overhead closer with integrated hold-open; rated to 550 lbs; requires door frame channel installation during framing; widely used on semi-frameless systems
• GEZE TS 5000 ECline: Concealed track-arm closer available for glass door frame header installation; European origin; fire-rated versions for UL 10C assemblies available through domestic distributors
• Allegion LCN 4040XPT: Concealed overhead closer for framed and semi-frameless systems; domestic availability and service network; rated for high-cycle applications

Narration Text

The concealed hardware selection happens in design development because these systems require structural and construction coordination that cannot be added later. A concealed floor spring requires a floor cassette coordinated with the structural slab — if you specify it after the concrete is poured, you are adding a saw-cut and core-drill operation to the schedule and budget. A concealed overhead closer requires a frame channel during framing. An integrated hinge-closer like the K51GG or a FritsJurgens pivot requires the glazing consultant to confirm that the fixed glass panel or wall connection is sized for the transferred load.

None of this coordination is impossible. But all of it must happen before construction documents are issued. The specification decision is not just "concealed vs. exposed" — it is a construction sequencing decision that touches slab work, glazing, and structural engineering simultaneously.

Sources: dormakaba ITS 96 BCA Product Data; GEZE TS 5000 ECline Technical Data; Waterson K51GG/K51GWL Product Specification; FritsJurgens System 3 Technical Guide; Allegion LCN 4040XPT Product Data

SLIDE 10 — Hydraulic Technology and Long-Term Performance in Glass Door Systems

Slide Title

Why Hydraulic Mechanisms Outperform Spring-Only Systems on Glass Doors

Key Content

#### The Glass Door Closing Challenge

Glass doors are uniquely demanding on closing hardware for three reasons:

1. Mass without compliance. A 200 lb glass door has no wood core to absorb impact. When it contacts the stop, the energy is transmitted directly to the glass and the patch fittings or pivot connections.

2. Smooth surfaces. Glass doors have no weather stripping compression to decelerate the door. A spring-only device applies full closing torque to the last degree of travel — the door arrives at the stop at high speed.

3. Temperature sensitivity. Spring-only closing devices (coil springs, torsion springs) change stiffness with ambient temperature. A spring adjusted correctly at 70°F will be noticeably stiffer at 35°F — changing the door's closing speed and feel with seasonal variation.

#### How Hydraulic Closing Works

Hydraulic fluid in the closer cylinder controls the rate of fluid transfer through a calibrated orifice. Two distinct zones of control are available:

• Sweep speed (general closing arc): Orifice controls the rate of fluid flow as the door swings from open position toward the last 15°–10° of travel
• Latch speed (slow zone): A separate, more restrictive orifice engages at the last 15°–5° of travel — the door decelerates gently and contacts the stop without impact
• Back-check: Hydraulic resistance limits the door's opening speed past approximately 70°–80° — prevents glass-to-wall impact if the door is flung open in high-traffic or wind-exposed entries

#### Performance Comparison: Spring-Only vs. Hydraulic

#### Hydraulic Options for Glass Doors

• Concealed floor spring (dormakaba BTS 75V, GEZE TS 500 NV): Entire hydraulic cassette below floor; pivot spindle carries door weight; adjustable sweep and latch speed; UL-listed versions available for fire-rated assemblies
• Overhead concealed closer (dormakaba ITS 96 BCA, GEZE TS 5000 ECline): Hydraulic cylinder in frame header or door top rail; minimal visible profile; two-speed adjustment from outside closer body; rated for semi-frameless and framed systems
• Integrated hinge-closer (Waterson K51GG/K51GWL): Hydraulic fluid in hinge barrel; closest to zero visible hardware; adjustable closing speed and hold-open via hex set screws on hinge body; available in UL fire-rated assembly versions

Narration Text

Why does hydraulic technology matter specifically for glass? Because glass does not absorb impact. A standard spring hinge tuned tightly enough to reliably latch a fire door can slam the door with enough force to crack the glass or fracture the patch fitting clamp. Hydraulic systems solve this by decoupling closing speed from closing force. You can specify enough torque to reliably latch a 200 lb fire door while independently controlling the deceleration profile so that the door arrives at the stop with near-zero velocity.

The latch speed adjustment is the most important hydraulic feature for glass doors — and the one most frequently misadjusted in the field. After installation, verify the latch speed zone by fully opening the door, releasing it, and observing the final 10 degrees of travel. The door should slow perceptibly at the transition to latch speed and contact the stop without audible impact. This test should be in the specification's field quality control requirements.

Sources: ANSI/BHMA A156.4 — Door Closers and Pivots; dormakaba BTS Series Technical Data; GEZE TS 500 NV Technical Data; Waterson K51GG/K51GWL Product Specification; FritsJurgens System 3 Technical Guide

SLIDE 11 — Specification Guide: K51GG and K51GWL Product Applications

Slide Title

Specifying the Right Product for the Right Glass Door Configuration

Key Content

#### Understanding the Configuration Decision

The two most common frameless glass door configurations that require a pivot hinge-closer are:

1. Glass-to-glass: The hinge side of the door has no wall — only a fixed glass panel (sidelight). The hinge must connect the door to the sidelight and transfer load into that panel.

2. Wall-mounted: The hinge side of the door has a structural wall or column. The hinge anchors to the wall and connects to the glass door.

These two configurations use fundamentally different mounting interfaces — a glass-to-glass connection versus a wall anchor system. They cannot be substituted for each other without changing the structural connection point.

#### Waterson K51GG — Glass-to-Glass Pivot Hinge-Closer

#### Waterson K51GWL — Wall-Mounted Glass Door Pivot Hinge-Closer

#### Application Decision Matrix

#### Competitive Context — What Else to Evaluate

AIA CES guidelines require that sponsored courses present a balanced view of the market. Architects specifying frameless glass door hardware should evaluate the K51GG and K51GWL alongside the following alternatives, each with different cost, lead time, and structural coordination requirements:

Cost ranges are approximate installed estimates based on 2024 market data for commercial projects. Actual costs vary by project location, contractor, and scope.

How to choose:

• Retrofit or slab-already-poured → K51GG/K51GWL or CRL/dormakaba patch fittings with overhead closer (no slab penetration required)
• New construction with slab coordination in design → dormakaba BTS + Manet, GEZE TS 500 NV, or FritsJurgens (floor cassette set before pour)
• Very heavy doors (>400 lbs) → FritsJurgens System 3 (ceiling-to-floor) or Rixson floor pivot with oversized floor spring
• Fire-rated assembly required → Confirm UL 10C listing on whichever product is specified; all products listed above have fire-rated versions available — verify UL file number with each manufacturer

Each product is a valid specification choice. The K51GG and K51GWL offer the advantage of no slab penetration and a single-component closer specification, at the trade-off of lower maximum door weight compared to floor spring systems on very heavy assemblies.

Narration Text

The K51GG and K51GWL represent the two standard frameless glass door pivot configurations — glass-to-glass and wall-mount. The integration of the hydraulic closer into the hinge body means architects specify one product rather than two (hinge and separate closer), and the door assembly has fewer components to list, certify, and maintain.

However, the integrated approach requires confirming two things before finalizing the specification: first, that a UL 10C listed version is available for fire-rated openings (not all configurations carry the listing), and second, that the glass specification is coordinated with a glazing consultant to verify the fixed panel or wall connection can carry the transferred load. Both confirmations belong in the submittal review process, not in a pre-pour field call.

The competitive landscape is healthy — dormakaba, CRL, Rixson, and FritsJurgens all have strong product lines for this application. The specification decision should be based on project requirements: available structural connection, fire rating, budget, and the owner's preference for integrated vs. separate closing hardware.

Sources: Waterson K51GG/K51GWL Product Specification; dormakaba Manet Patch Fitting Data; C.R. Laurence Architectural Glass Hardware Catalog; Rixson Floor Closer Product Guide; FritsJurgens System 3 Technical Guide; UL 10C

SLIDE 12 — Writing the Specification: Division 08 Language for Glass Door Hardware

Slide Title

What to Write in Division 08 — Glass Door Hardware Specification Language

Key Content

#### CSI MasterFormat Structure for Glass Door Systems

Coordination note: Division 08 71 00 must cross-reference 08 81 00 for glass thickness and safety glazing requirements. These sections are often issued to different contractors — the specification must explicitly require coordination between the glazing contractor and the hardware contractor before installation begins.

#### Sample Specification Language — Section 08 71 00 (Glass Door Hardware)

SECTION 08 71 00 — DOOR HARDWARE

PART 1 — GENERAL

1.01 SCOPE
     This section covers glass door hardware for frameless and semi-frameless
     glass door assemblies as indicated on the Door Schedule and Hardware Sets.

1.02 REFERENCES
     ANSI Z97.1 (current edition) — Safety Glazing Materials Used in Buildings
     CPSC 16 CFR Part 1201 — Safety Standard for Architectural Glazing Materials
     IBC Chapter 10 — Means of Egress (current edition adopted by jurisdiction)
     IBC Chapter 24 — Glass and Glazing (current edition)
     IBC §1010 — Doors, Gates, and Turnstiles
     IBC §2406 — Safety Glazing
     NFPA 80 (current edition) — Fire Doors and Other Opening Protectives
     UL 10C — Positive Pressure Fire Tests of Door Assemblies
     ICC A117.1 (current edition) — Accessible and Usable Buildings and Facilities
     ANSI/BHMA A156.4 (current edition) — Door Closers and Pivots

1.03 SUBMITTALS
     A. Product Data: Submit manufacturer's technical data for each hardware item.
        For fire-rated assemblies, include UL file number and listing scope.
     B. Shop Drawings: Submit door schedule showing hardware set designation,
        door size, glass specification, and fire rating for each opening.
     C. Coordination: Hardware contractor to meet with glazing contractor
        (Section 08 81 00) prior to fabrication. Confirm glass thickness,
        notch locations, and fixed panel structural requirements.

PART 2 — PRODUCTS

2.01 GLASS-TO-GLASS PIVOT HINGE-CLOSER
     (Where indicated on Door Schedule as Hardware Set Type GG)
     
     Manufacturer: Waterson USA K51GG, or dormakaba Manet with separate
                   UL-listed floor spring per 2.03, or approved equal.
     
     If integrated hinge-closer (K51GG or equal):
       Door weight capacity:   400 lbs maximum per hinge set
       Glass thickness:        3/4" (19mm) tempered minimum, door and
                               fixed sidelight panel
       Closing mechanism:      Integrated hydraulic; adjustable sweep
                               speed, latch speed, and hold-open
       Fire rating:            Provide UL 10C listed version for all
                               fire-rated openings (confirm UL file number)
       Material:               316 stainless steel
       Finish:                 As scheduled on Door and Finish Schedule
       Structural requirement: Fixed sidelight must be engineered for
                               transferred hinge load. Coordinate with
                               structural engineer prior to glass order.
     
2.02 WALL-MOUNTED GLASS DOOR PIVOT HINGE-CLOSER
     (Where indicated on Door Schedule as Hardware Set Type WM)
     
     Manufacturer: Waterson USA K51GWL, or Rixson concealed floor pivot
                   with separate wall bracket, or approved equal.
     
       Door weight capacity:   400 lbs maximum per hinge set
       Glass thickness:        3/4" (19mm) tempered minimum, door leaf
       Closing mechanism:      Integrated hydraulic; adjustable sweep
                               speed, latch speed, and hold-open
       Wall attachment:        Wall bracket with expansion anchors;
                               structural wall required.
                               Coordinate anchor loads with structural
                               engineer. Provide calculation to Architect.
       Fire rating:            Provide UL 10C listed version for all
                               fire-rated openings (confirm UL file number)
       Material:               316 stainless steel
       Finish:                 As scheduled

2.03 CONCEALED FLOOR SPRINGS
     (Where indicated on Door Schedule as Hardware Set Type FS)
     
     Manufacturer: dormakaba BTS 75V or BTS 80, or GEZE TS 500 NV,
                   or Rixson Model 27, or approved equal.
     
       Grade:        ANSI/BHMA A156.4 Grade 1
       Capacity:     Size per manufacturer's load table for door
                     weight and width; submit load calculation
       Hold-open:    Adjustable hold-open at 90° and/or 180°
       UL listing:   Required for fire-rated assemblies; confirm UL 10C
                     listing mark on product and cut sheet
       Floor cassette: Coordinate cassette dimensions with structural
                     drawings before slab pour. Set cassette elevation
                     per finished floor elevation. Coordinate with
                     concrete contractor.

2.04 SAFETY GLAZING REQUIREMENTS (coordinate with Section 08 81 00)
     All glass in door leaves and in sidelights and adjacent panels
     within hazardous locations per IBC §2406.4: provide tempered glass
     meeting ANSI Z97.1 Class A and CPSC 16 CFR Part 1201 Category II.
     
     Fire-rated glass at 45-minute, 60-minute, and 90-minute openings:
     Provide fire-rated ceramic glass (e.g., Pilkington Pyroswiss,
     NSG Pyrobel, Vetrotech Saint-Gobain, or equal) as part of complete
     UL 10C tested assembly. Wired glass is NOT acceptable at openings
     rated 45 minutes or above.

2.05 SELF-CLOSING AND LATCHING REQUIREMENTS (fire-rated openings)
     A. All hardware on fire-rated glass door assemblies must be
        individually UL-listed and bear a visible UL listing mark.
     B. Listing must be part of the same tested assembly as the door
        and frame per UL 10C. Submit UL file number for each component.
     C. Positive latching per NFPA 80 §5.2.1.2(9): latching hardware
        must engage strike without manual assistance; door must be
        positively held closed in the latched position.
     D. Magnetic latches for fire-rated openings: provide latches
        individually UL-listed for positive-pressure fire door use.

PART 3 — EXECUTION

3.01 INSTALLATION
     A. Install per manufacturer's written instructions and the tested
        assembly configuration documented in the UL file.
     B. Do not modify glass, notch dimensions, or hardware after the
        UL listing label is applied.
     C. Coordinate installation sequence with glazing contractor
        (Section 08 81 00) and structural contractor.
     D. For floor springs: install cassette per Section 03 00 00;
        verify elevation before concrete placement.

3.02 FIELD QUALITY CONTROL
     A. After installation, verify door closes and positively latches
        from full-open position under door's own weight (no manual
        assistance).
     B. Measure opening force at accessible door edge using calibrated
        gauge. Record force. Maximum 5 lbs at interior accessible doors
        per ICC A117.1 §404.2.8.
     C. Measure and record all door-to-frame clearances. Maximum 1/8"
        at all edges per NFPA 80.
     D. Verify latch speed zone: door should decelerate perceptibly
        in the final 10 degrees of travel without audible impact on stop.
     E. Provide baseline field inspection record to Owner for annual
        NFPA 80 maintenance program.

Narration Text

This specification language covers the four areas where glass door specifications most commonly fail submittal review and field inspection: glass type selection at fire-rated openings, individual component listing on fire assemblies, positive latching compliance, and safety glazing coordination between the hardware set and the glazing section.

The two explicit coordination notes in this language — structural engineer for wall anchors on wall-mounted configurations, and glazing contractor for fixed panel structural adequacy on glass-to-glass configurations — are where field problems most often originate. These are not construction administration items. They are design decisions that determine whether the glass can be ordered and cut correctly. Write them into the specification. Requiring a pre-fabrication meeting between the hardware contractor and the glazing contractor as a submittal condition is one of the most effective tools an architect has for preventing a glass door problem before it reaches the job site.

Sources: CSI MasterFormat — Sections 08 12 13, 08 71 00, 08 81 00; UL 10C; NFPA 80 §5.2.1.2(9); IBC §2406; ICC A117.1 §404.2.8; ANSI/BHMA A156.4

SLIDE 12B — INTERACTIVE ELEMENT 4: Open-Ended Specification Judgment Exercise

[INTERACTIVE — Professional Judgment Scenario: The Retrofit Decision]

Title: The Mid-Construction Glass Door Problem — What Would You Do?

Format: An open-ended written reflection exercise. Unlike the previous multiple-choice interactions, this exercise presents a realistic field scenario and asks the learner to draft a written response explaining their professional judgment. A model answer is revealed after the learner submits or proceeds. There is no single correct answer — the exercise is designed to encourage genuine professional reasoning.

Estimated completion time: 6–8 minutes | Slide timing position: ~55 minutes into course

#### Scenario

You are the architect of record for a corporate headquarters project — a 12-story office building with frameless all-glass entries on floors 1 and 2. The structural slab was poured three months ago. During a site review, the glazing contractor informs you that the hardware subcontractor has submitted shop drawings specifying dormakaba BTS 75V concealed floor springs for the primary lobby doors on floor 1.

>

The problem: The floor cassette blockout for the BTS 75V was not included in the original structural drawings — it was never coordinated. The slab has been poured solid at the entry locations. Adding the BTS floor spring now would require saw-cutting the 8-inch post-tensioned concrete slab.

>

The structural engineer has been contacted and advises that saw-cutting a post-tensioned slab at these locations is structurally inadvisable — the post-tensioning tendons cannot be reliably located in this slab section, and cutting risks severing a tendon.

>

The glazing subcontractor wants to proceed with the BTS floor spring anyway. The hardware subcontractor says "we can core drill around it." The owner wants the original all-glass concealed aesthetic.

Your task: In 3–5 sentences, explain:

1. What is the root cause of this problem and who bears responsibility?

2. What alternative hardware approach can still deliver the all-glass aesthetic without cutting the slab?

3. What specification and coordination change would prevent this on your next project?

(This is an open-ended response — write what you would actually do. There is no single correct answer. A model response follows.)

#### Model Response (revealed after learner submits)

Root cause and responsibility: The floor spring cassette blockout was a design coordination item that should have appeared in the structural drawings during design development — this is a design team coordination failure. The structural drawings did not include the cassette opening, the hardware schedule did not flag the slab coordination requirement, and no pre-pour coordination meeting confirmed the cassette placement. Primary responsibility lies with the design team for not issuing a coordination bulletin; the hardware subcontractor's submittal process should have caught the discrepancy before pour, but the design record should have preempted this.

Alternative approach: The owner's all-glass aesthetic can be preserved without cutting the slab by switching to an integrated hinge-closer system — such as the Waterson K51GG (glass-to-glass) or a FritsJurgens top-pivot system with concealed ceiling anchors — where the closing mechanism is housed in the hinge body or top pivot, not the floor. No slab penetration is required. The cost impact is a change order for the hardware substitution, but it avoids the structural risk and schedule impact of attempting to saw-cut a post-tensioned slab. The structural engineer should confirm the revised anchor loading for the top pivot at the ceiling.

Specification change: Add a mandatory floor spring coordination note to Section 08 71 00: "Where concealed floor spring hardware is specified, the hardware contractor shall provide cassette dimensions and elevation to the structural engineer for inclusion in foundation and slab drawings no later than design development. Cassette blockout shall be confirmed in structural drawings and verified prior to concrete placement. Floor spring specifications shall not be finalized until structural confirmation is received." Also add this item to the mechanical/structural coordination checklist in the project's pre-construction meeting agenda.

Lesson: The concealed floor spring is an excellent product that depends entirely on a coordination decision made during design development — before the slab is poured. The elegant lobby aesthetic visible at occupancy was enabled by a structural drawing notation added months earlier. When that notation is missing, the aesthetic is still possible but the pathway is expensive and, in post-tensioned slabs, potentially structural risk.

Narration Text

This exercise has no multiple-choice answer because real projects rarely do. The ability to assess a field situation, identify who made which decision, propose a technically sound recovery path, and then translate the lesson into a specification change — that is what AIA Learning Unit credit is for.

The pattern this scenario illustrates appears in practice more often than architects expect: glass door hardware systems that require pre-pour slab coordination are specified, the coordination note is not written into the structural documents, and the problem surfaces in the field when it is expensive or structurally risky to correct. The mitigation is a single line in the specification and a standing item on the pre-construction coordination meeting agenda.

Sources: dormakaba BTS Series Technical Data; Waterson K51GG/K51GWL Product Specification; FritsJurgens System 3 Technical Guide; ACI 318 — Building Code Requirements for Structural Concrete (post-tensioned slab considerations); RSMeans commercial construction cost data

POST-TEST — 10 Questions (80% Pass Rate Required for AIA Credit)

Instructions: Answer all 10 questions. A score of 8 out of 10 (80%) is required to receive 1.0 LU/HSW credit. Each question has one correct answer.

Recall Questions (4)

Question R1

What test standard governs positive pressure fire testing of swinging glass door assemblies in U.S. commercial construction?

• A) UL 9 — Fire Tests of Window Assemblies
• B) UL 10C — Positive Pressure Fire Tests of Door Assemblies ← Correct
• C) NFPA 252 — Standard Methods of Fire Tests of Door Assemblies
• D) ASTM E2074 — Standard Test Method for Fire Tests of Door Assemblies

Reference: Slide 5

Explanation: UL 10C is the primary U.S. standard for positive pressure fire testing of swinging commercial door assemblies, including glass door assemblies. UL 9 covers window assemblies. NFPA 252 and ASTM E2074 are alternative methods but UL 10C is the dominant commercial specification referenced by NFPA 80 and IBC.

Question R2

Per IBC §2406.4, in which locations is safety glazing (tempered or laminated glass) required?

• A) Only in overhead skylights and glass floors
• B) Only in glass doors with a 60-minute or higher fire rating
• C) In all door leaves, and in fixed panels within 24 inches of a door edge from floor to 60 inches above finished floor ← Correct
• D) Only in exterior doors exposed to the weather

Reference: Slide 7

Explanation: IBC §2406.4 defines hazardous locations to include all glass in door leaves plus glazing in panels adjacent to doors (within 24 inches of door edge, from floor to 60 inches AFF). Safety glazing is required at all these locations regardless of fire rating.

Question R3

Which fire rating level permits wired glass in a commercial door opening, under what conditions?

• A) 45-minute openings — wired glass is acceptable up to 100 sq. in.
• B) 60-minute openings — wired glass is permitted with wire mesh on the fire side only
• C) 90-minute openings — wired glass with a ceramic interlayer is permitted
• D) 20-minute openings in legacy conditions only — wired glass is prohibited at 45 minutes and above, and is prohibited in hazardous locations at any rating ← Correct

Reference: Slide 5

Explanation: IBC Table 716.6 and NFPA 80 limit wired glass to 20-minute openings in legacy conditions. Above 20 minutes, fire-rated ceramic glass is required. Additionally, wired glass fails CPSC 16 CFR Part 1201 Category II impact safety, making it prohibited in hazardous locations (door openings) regardless of fire rating.

Question R4

What is the maximum permitted opening force at a fire-rated egress door, and at an interior door on an ADA accessible route?

• A) 30 lbs at egress doors; 30 lbs at accessible route doors
• B) 15 lbs at egress doors; 15 lbs at accessible route doors
• C) 30 lbs to set in motion / 15 lbs to full travel at fire-rated egress doors (IBC §1010.1.3); 5 lbs at interior accessible route doors (ICC A117.1 §404.2.8) ← Correct
• D) 50 lbs at egress doors; 10 lbs at accessible route doors

Reference: Slides 7, 8

Explanation: IBC §1010.1.3 establishes 30 lbs (set in motion) and 15 lbs (to full open travel) for fire-rated egress doors. However, when a door is also on an ADA accessible route, ICC A117.1 §404.2.8 imposes a 5 lbs maximum for interior doors — the more restrictive standard applies.

Application Questions (4)

Question A1

An architect is specifying a frameless glass door connected to a fixed glass sidelight on the hinge side. No wall is available. Which hardware configuration is correct?

• A) Standard butt hinges mounted to a concealed steel channel welded into the sidelight frame
• B) Surface-mounted overhead closer arm attached directly to the surface of the sidelight glass
• C) Glass-to-glass pivot hinge (e.g., Waterson K51GG or dormakaba Manet patch fitting) connecting the door to the structurally engineered sidelight panel ← Correct
• D) Floor spring only — no hinge connection to the sidelight is necessary

Reference: Slides 3, 4, 11

Explanation: Glass-to-glass hinges are the only code-compliant structural option when no wall or frame is available on the hinge side. The sidelight must be engineered to accept the transferred hinge loads. Option A adds a structural element that defeats the all-glass aesthetic. Option B is not a structural solution. Option D provides only the bottom pivot and closing mechanism — a top connection and hinge connection are still required.

Question A2

A 60-minute fire-rated glass door is specified with full-vision glazing. Which glass type is required?

• A) Standard 3/4" tempered float glass — tempered glass is sufficient for fire-rated doors
• B) Wired glass, 1/4" thick, because wire mesh provides fire resistance
• C) Laminated safety glass, non-fire-rated, with intumescent seal in the frame
• D) Fire-rated ceramic glass (e.g., Pilkington Pyroswiss, NSG Pyrobel, or equal) — wired glass is not permitted at 60-minute ratings, and standard tempered glass has no fire rating ← Correct

Reference: Slides 5, 6

Explanation: Per IBC Table 716.6, 60-minute fire-rated openings require fire-rated ceramic glass. Standard tempered glass has no fire rating. Wired glass is limited to 20-minute legacy conditions only and fails CPSC impact safety requirements. Laminated glass is a safety glazing product but carries no fire rating unless specifically manufactured and tested as fire-rated.

Question A3

A glass door in a hotel lobby is on an ADA accessible route. A hydraulic hinge-closer is adjusted to 8 lbs opening force at the door edge. Does this door comply with applicable standards?

• A) Yes — 8 lbs is well within the 30 lbs egress limit
• B) Yes — hotel lobby doors are exempt from the 5 lbs ADA limit because of high traffic volume
• C) No — ICC A117.1 §404.2.8 requires a maximum of 5 lbs opening force at interior accessible doors; 8 lbs exceeds this limit and renders the door non-compliant ← Correct
• D) Yes — hydraulic closers automatically comply with ADA force requirements by design

Reference: Slides 7, 10

Explanation: ICC A117.1 §404.2.8 requires a maximum of 5 lbs at interior doors on accessible routes, regardless of occupancy type or door size. At 8 lbs, this door fails the accessible route standard. There are no hotel or high-traffic exemptions. The hydraulic mechanism enables easy adjustment, but does not guarantee compliance — force must be measured and recorded after adjustment.

Question A4

An architect specifies a concealed hydraulic floor spring for a frameless glass lobby door. At what stage of construction must the floor spring installation be coordinated?

• A) During furniture and fixture installation after drywall is complete
• B) During rough-in MEP coordination — floor springs are similar to floor drain installations
• C) During structural slab construction — the floor cassette must be set to finished floor elevation before the concrete slab is poured ← Correct
• D) At substantial completion, during final hardware installation only

Reference: Slide 9

Explanation: The floor cassette of a concealed floor spring must be set into the concrete slab at the correct finished floor elevation during slab construction. Adding a floor spring after the slab is poured requires saw-cutting and core-drilling the concrete — a significant additional cost and schedule impact. This coordination must happen during design development so that the structural drawings reflect the cassette blockout.

Judgment Questions (2)

Question J1

A hardware submittal for a 45-minute fire-rated frameless glass door shows: UL-listed glass patch fittings (UL file number confirmed), a hydraulic floor spring with no UL listing number noted on the cut sheet, and a magnetic latch with a UL listing mark. Which is the most appropriate action?

• A) Approve the set — the door, patch fittings, and latch are all UL-listed; the floor spring is a minor omission
• B) Approve with a field verification note — the floor spring listing can be confirmed during installation
• C) Reject the submittal — the floor spring must carry its own individual UL 10C listing mark; all hardware components on a fire-rated assembly must be individually listed, and a missing UL number cannot be resolved after installation ← Correct
• D) Forward to the fire protection engineer for determination — the architect cannot make this judgment

Reference: Slides 5, 6

Explanation: NFPA 80 requires every component of a fire door assembly to be individually UL-listed for the rating. A floor spring without a documented UL listing number is not a minor omission — it is an unlisted component that invalidates the fire door label for the entire assembly. This cannot be resolved by field verification after installation; it must be corrected before approval.

Question J2

A design client requests frameless all-glass double doors on the primary egress path for a 300-person restaurant. The design shows fixed glass sidelights, pull handles, and magnetic hold-open released by fire alarm. An architect reviews the design. Which additional hardware requirement is most critical to identify?

• A) The doors require surface-mounted closers because frameless doors cannot use concealed closing systems
• B) Wired glass is required for restaurant occupancies because of kitchen fire exposure
• C) Panic hardware is required on at least one door leaf because the egress path serves an Assembly occupancy exceeding 49 persons — per IBC §1010.2.9 ← Correct
• D) Magnetic hold-open is prohibited on restaurant egress doors under all conditions

Reference: Slides 7, 8

Explanation: IBC §1010.2.9 requires panic hardware on egress doors serving Group A (Assembly) occupancies with occupant loads of 50 or more. A 300-person restaurant is clearly a Group A occupancy exceeding the threshold — panic hardware is mandatory on at least one active leaf. Pull handles alone do not satisfy this requirement. Frameless glass doors can use concealed closing systems, and wired glass is not required for restaurant occupancies. Magnetic hold-open is not categorically prohibited, but must be UL-listed for fire door use if the opening is fire-rated.

COURSE SUMMARY

What You Learned

This course covered the complete specification workflow for glass door systems:

1. System types and their hardware implications: Frameless, semi-frameless, framed, and storefront systems each require different hardware families. Frameless systems transfer all structural load through patch fittings or pivots directly to the glass.

2. Hardware vocabulary: Patch fittings, pivot hinges, glass-to-glass hinges, and floor springs each solve specific structural problems. Glass-to-glass hinges require the fixed sidelight panel to be structurally engineered.

3. UL 10C fire door requirements: All fire-rated glass door assemblies must be tested and listed under UL 10C. Every hardware component — patch fitting, pivot, floor spring, latch — must carry its own individual UL listing mark. Fire-rated ceramic glass (Pilkington Pyroswiss, NSG Pyrobel, or equal) is required at 45-minute ratings and above. Wired glass is prohibited at door hazardous locations.

4. Safety code compliance: Safety glazing (CPSC 16 CFR Part 1201 Category II, ANSI Z97.1 Class A) is required in all door leaves and adjacent hazardous locations per IBC §2406.4. Egress force limits of 5 lbs (ICC A117.1) govern accessible routes. Panic hardware is required at Assembly and Educational occupancies exceeding 49 persons.

5. Concealed hardware and hydraulic performance: Concealed floor springs (dormakaba BTS, GEZE TS 500 NV, Rixson), integrated hinge-closers (Waterson K51GG/K51GWL, FritsJurgens), and overhead concealed closers (dormakaba ITS 96, GEZE TS 5000, Allegion LCN) provide controlled glass door closing without surface hardware. Hydraulic mechanisms decouple closing speed from closing force — critical for preventing glass impact damage.

6. Division 08 specification language: CSI Sections 08 71 00 and 08 81 00 must be explicitly coordinated. Glass type, structural requirements for fixed panels, wall anchor loads, and UL listing requirements must all appear in the specification — not left to field coordination.

Standards Referenced in This Course

Manufacturers Referenced in This Course

Waterson-specific product content estimated at approximately 15% of total course content — compliant with AIA CES ≤20% promotional content requirement.

WTR-HSW-009 Full Course Draft — Glass Door Systems & Modern Frameless Hardware: Specification & Safety

Writer A — 2026-04-28

AIA CES Provider #40115764

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