Red Seal Glazier flashcards
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32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Allowable load per ASTM E1300
- A design chart method giving the allowable uniform lateral load for a glass pane based on nominal thickness, pane dimensions and support condition (four-side, three-side, two-side or cantilever).
- Heat-strength vs tempered glass
- Heat-strengthened glass has about twice the strength of annealed glass and breaks into larger shards; fully tempered glass has about four times the strength and breaks into small dice-like particles.
- Safety glazing hazardous locations
- Glazing in doors, within 24 inches of a door edge, under 18 inches above the floor, and large panes in hazardous locations must be safety glazing meeting 16 CFR 1201.
- Ionoplast interlayer
- A stiff structural interlayer (SGP) used in laminated glass that provides much greater post-breakage stiffness and residual strength than standard PVB, common in overhead and blast glazing.
- Setting block placement
- Setting blocks support glass in a frame and are placed at the quarter points of the bottom edge, never at the corners, so the glass does not bear on the frame corners.
- Polycarbonate vs acrylic glazing
- Polycarbonate is far tougher than acrylic but yellows under UV unless coated; acrylic is about half the weight of glass and clearer but scratches easily.
- Spandrel glass
- Opaque-backed glass used to hide floor slabs and structure; heat-treated glass is often required because the opaque coating raises thermal stress, and ceramic frit is the durable option.
- Structural silicone bite formula
- Bite equals the shortest glass dimension times design wind pressure, divided by two times the allowable silicone stress; typical allowable stress is about 20 psi for wind load.
- SSG mechanical retention
- Two-sided structural silicone glazing must include a mechanical retainer such as edge blocks or a channel that holds the glass if the structural silicone bond fails.
- Curtain wall drift accommodation
- Curtain wall systems must accommodate inter-story drift of roughly L/100 to L/200 plus 0.5 inch through slotted connections, gaskets and joint design.
- Pressure-equalized rain screen
- A drained and vented cavity behind the outer seal that equalizes air pressure across the rain screen, so water is drained out through weeps rather than forced inward.
- AAMA 501 mock-up tests
- A series of tests on a full-size mock-up covering air infiltration (ASTM E283), static and dynamic water penetration (ASTM E331, AAMA 501.1) and structural performance (ASTM E330).
- Aluminum thermal expansion
- Aluminum expands about 13 × 10⁻⁶ per °F (23 × 10⁻⁶ per °C); a 10-foot mullion moves roughly 0.16 inch over a 100°F temperature swing.
- Storefront height limit
- Storefront framing is generally limited to about 12 to 14 feet in height and depends on the building structure for lateral support, unlike floor-to-floor curtain wall.
- SSG field adhesion test
- A peel test performed on the actual glass and metal substrates before installation to confirm that the structural silicone bonds properly and is compatible with tapes and spacers.
- Skylight glazing requirement
- Sloped glazing and skylights generally require laminated glass, tempered glass or a combination, and often a screen or guard beneath for fall protection.
- Minimum skylight slope
- Shingle-type sloped glazing systems typically require a minimum slope of about 3 in 12 (roughly 14 degrees); lower slopes need special gasketed or sealed systems.
- Skylight condensation drainage
- Skylights need a thermal-broken frame, warm-edge spacers and an interior gutter that drains condensation to the exterior through a weep path.
- NFRC label values
- The NFRC label reports whole-assembly U-factor, solar heat gain coefficient and visible transmittance, allowing comparison of window thermal and solar performance.
- Soft-coat vs hard-coat low-e
- Soft-coat low-e has lower emissivity and better U-value but must be protected on an interior surface; hard-coat low-e is durable and can be exposed to the weather.
- Standard door leaf thickness
- A standard commercial door leaf is 1¾ inches thick, with typical height 7 feet 0 inches, and requires hinge and closer reinforcement specified in the hardware schedule.
- Door sidelight glazing
- Glass in door leaves and in sidelights within 24 inches of the door edge must be safety glazing and must carry a visible safety glazing label.
- Window air and water tests
- Window performance is verified by ASTM E283 air leakage, ASTM E547 or E331 water penetration, and ASTM E330 structural pressure testing.
- Skylight fall protection
- Skylights in roof areas often require impact-rated glazing or a guard screen beneath, because the glazing must resist a 200-pound impact or be protected.
- Shower door safety glazing
- Shower doors and tub enclosures require tempered or laminated safety glazing; framed units typically use 3/16 to 3/8 inch glass, frameless units 3/8 to 1/2 inch.
- Frameless shower hole spacing
- Holes for hinges and clamps must be drilled before tempering, are commonly 1/2 inch diameter, and must be at least 1½ times the hole diameter from any edge.
- Mirror edge sealing
- Mirror edges should be sealed and the back allowed to breathe, because trapped moisture causes black-edge corrosion and silvering failure at the edges.
- Mirror safety backing
- Mirrors in hazardous locations such as doors and gyms must be safety-backed or laminated so broken pieces stay adhered to the backing.
- Glass guardrail loading
- Glass guard infill must resist a 200-pound concentrated load in any direction and 50 pounds per linear foot at the top rail, and panels are usually laminated.
- Leaded glass support
- Leaded and copper-foil panels need saddle bars or rebar for support over spans of roughly 2 to 3 feet to prevent sagging of the lead came.
- Obscure glass privacy limit
- Patterned or obscure glass reduces visibility but does not guarantee privacy at night, when a lit interior makes the glass transparent from outside.
- Tempered glass label
- Tempered safety glazing must carry a permanent, visible label identifying it as safety glazing; the label must remain after installation.