Each pane of tempered glass, except tempered spandrel glass, shall be permanently identified by the manufacturer. The identification mark shall be acid etched, sand blasted, ceramic fired, laser etched, embossed or of a type that, once applied, cannot be removed without being destroyed.
Tempered spandrel glass shall be provided with a removable paper marking by the manufacturer.
Wired glass with wire exposed on longitudinal edges shall not be used in louvered windows or jalousies.
Where other glass types are used, the design shall be submitted to the building official for approval.
The design of vertical glazing shall be based on the following equation:
Fgw ≤ Fga | (Equation 24-1) |
where:
Fgw | = | Wind load on the glass computed in accordance with Section 1609. |
Fga | = | Short duration load on the glass as determined in accordance with ASTM E 1300. |
Fg = Wo – D | (Equation 24-2) |
Fg = Wi + D + 0.5 S | (Equation 24-3) |
Fg = 0.5 Wi + D + S | (Equation 24-4) |
where:
D | = | Glass dead load psf (kN/m2). |
For glass sloped 30 degrees (0.52 rad) or less from horizontal, | ||
= | 13 tg(For SI: 0.0245 tg). | |
For glass sloped more than 30 degrees (0.52 rad) from horizontal, | ||
= | 13 tg cos θ (For SI: 0.0245 tg cos θ). | |
Fg | = | Total load, psf (kN/m2) on glass. |
S | = | Snow load, psf (kN/m2) as determined in Section 1608. |
tg | = | Total glass thickness, inches (mm) of glass panes and plies. |
Wi | = | Inward wind force, psf (kN/m2) as calculated in Section 1609. |
Wo | = | Outward wind force, psf (kN/m2) as calculated in Section 1609. |
θ | = | Angle of slope from horizontal. |
The design of sloped glazing shall be based on the following equation:
Fg ≤ Fga | (Equation 24-5) |
where:
Fg | = | Total load on the glass determined from the load combinations above. |
Fga | = | Short duration load resistance of the glass as determined according to ASTM E 1300 for Equations 24-2 and 24-3; or the long duration load resistance of the glass as determined according to ASTM E 1300 for Equation 24-4. |
Fgw < 0.5 Fge | (Equation 24-6) |
Fgw | = | Is the wind load on the glass computed per Section 1609. |
Fge | = | Nonfactored load from ASTM E 1300 using a thickness designation for monolithic glass that is not greater than the thickness of wired glass. |
Fg < 0.5 Fge | (Equation 24-7) |
Fg < 0.3 Fge | (Equation 24-8) |
Fg | = | Total load on the glass. |
Fge | = | Nonfactored load from ASTM E 1300. |
Fgw < 1.0 Fge | (Equation 24-9) |
Fgw | = | Wind load on the glass computed per Section 1609. |
Fge | = | Nonfactored load from ASTM E 1300. The value for patterned glass shall be based on the thinnest part of the glass. Interpolation between nonfactored load charts in ASTM E 1300 shall be permitted. |
Fg < 1.0 Fge | (Equation 24-10) |
For Equation 24-4:
Fg< 0.6 Fge | (Equation 24-11) |
Fg | = | Total load on the glass. |
Fge | = | Nonfactored load from ASTM E 1300. The value for patterned glass shall be based on the thinnest part of the glass. Interpolation between the nonfactored load charts in ASTM E 1300 shall be permitted. |
Fg< 0.5 Fge | (Equation 24-12) |
Fg | = | Total load on the glass. |
Fge | = | Nonfactored load from ASTM E 1300. The value for sandblasted glass is for moderate levels of sandblasting. |
Annealed glass is permitted to be used as specified within Exceptions 2 and 3 of Section 2405.3.
For additional requirements for plastic skylights, see Section 2610. Glass-block construction shall conform to the requirements of Section 2101.2.5.
Fg ≤ PG | (Equation 24-13) |
Fg | = | Maximum load on the skylight determined from Equations 24-2 through 24-4 in Section 2404.2. |
PG | = | Performance grade rating of the skylight. |
Fgi ≤ PGPo | (Equation 24-14) |
Fgo ≤ PGNe | (Equation 24-15) |
PGPos | = | Performance grade rating of the skylight under positive design pressure; |
PGNeg | = | Performance grade rating of the skylight under negative design pressure; and |
For Wo ≥D,
Wo | = | Outward wind force, psf (kN/m2) as calculated in Section 1609. |
D | = | The dead weight of the glazing, psf (kN/m2) as determined in Section 2404.2 for glass, or by the weight of the plastic, psf (kN/m2) for plastic glazing. |
Fgi | = | Maximum load on the skylight determined from Equations 24-3 and 24-4 in Section 2404.2. |
Fgo | = | Maximum load on the skylight determined from Equation 24-2. |
Wo | = | Is the outward wind force, psf (kN/m2) as calculated in Section 1609. |
D | = | The dead weight of the glazing, psf (kN/m2) as determined in Section 2404.2 for glass, or by the weight of the plastic for plastic glazing. |
Fgi | = | Maximum load on the skylight determined from Equations 24-2 through 24-4 in Section 2404.2. |
Fgo | = | 0. |
Exception: Mirrors and other glass panels mounted or hung on a surface that provides a continuous backing support.
TABLE 2406.2(1)
MINIMUM CATEGORY CLASSIFICATION OF GLAZING USING CPSC 16 CFR PART 1201
EXPOSED SURFACE AREA OF ONE SIDE OF ONE LITE | GLAZING IN STORM OR COMBINATION DOORS (Category class) | GLAZING IN DOORS (Category class) | GLAZED PANELS REGULATED BY SECTION 2406.4.3 (Category class) | GLAZED PANELS REGULATED BY SECTION 2406.4.2 (Category class) | DOORS AND ENCLOSURES REGULATED BY SECTION 2406.4.5 (Category class) | SLIDING GLASS DOORS PATIO TYPE (Category class) |
9 square feet or less | I | I | No requirement | I | II | II |
More than 9 square feet | II | II | II | II | II | II |
TABLE 2406.2(2)
MINIMUM CATEGORY CLASSIFICATION OF GLAZING USING ANSI Z97.1
EXPOSED SURFACE AREA OF ONE SIDE OF ONE LITE | GLAZED PANELS REGULATED BY SECTION 2406.4.3 (Category class) | GLAZED PANELS REGULATED BY SECTION 2406.4.2 (Category class) | DOORS AND ENCLOSURES REGULATED BY SECTION 2406.4.5a (Category class) |
9 square feet or less | No requirement | B | A |
More than 9 square feet | A | A | A |
Exceptions:
Deleted
Exceptions:
Exceptions:
Exceptions:
Deleted
Exception: Glazing that is more than 60 inches (1524 mm), measured horizontally and in a straight line, from the water’s edge of a bathtub, hot tub, spa, whirlpool, or swimming pool.
Exceptions:
Exception: Glazing that is protected by a guard complying with Sections 1013 and 1607.8 where the plane of the glass is greater than 18 inches (457 mm) from the guard.
Deleted
Exception: A top rail shall not be required where the glass balusters are laminated glass with two or more glass plies of equal thickness and the same glass type when approved by the building official. The panels shall be designed to withstand the loads specified in Section 1607.8.
Exception: Tempered glass shall be permitted to be used for lining walls and ceilings of elevator cars provided: