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. |
- For monolithic glazing systems, the glazing material of the single light or layer shall be laminated glass with a minimum 30-mil (0.76 mm) polyvinyl butyral (or equivalent) interlayer, wired glass, light-transmitting plastic materials meeting the requirements of Section 2607, heat-strengthened glass or fully tempered glass.
- For multiple-layer glazing systems, each light or layer shall consist of any of the glazing materials specified in Item 1 above.
For additional requirements for plastic skylights, see Section 2610. Glass-block construction shall conform to the requirements of Section 2101.2.5.
- Fully tempered glass installed without protective screens where glazed between intervening floors at a slope of 30 degrees (0.52 rad) or less from the vertical plane shall have the highest point of the glass 10 feet (3048 mm) or less above the walking surface.
- Screens are not required below any glazing material, including annealed glass, where the walking surface below the glazing material is permanently protected from the risk of falling glass or the area below the glazing material is not a walking surface.
- Any glazing material, including annealed glass, is permitted to be installed without screens in the sloped glazing systems of commercial or detached noncombustible greenhouses used exclusively for growing plants and not open to the public, provided that the height of the greenhouse at the ridge does not exceed 30 feet (9144 mm) above grade.
- Screens shall not be required within individual dwelling units in Groups R-2, R-3 and R-4 where fully tempered glass is used as single glazing or as both panes in an insulating glass unit, and the following conditions are met:
- Each pane of the glass is 16 square feet (1.5 m2) or less in area.
- The highest point of the glass is 12 feet (3658 mm) or less above any walking surface or other accessible area.
- The glass thickness is 3/16 inch (4.8 mm) or less.
- Screens shall not be required for laminated glass with a 15-mil (0.38 mm) polyvinyl butyral (or equivalent) interlayer used within individual dwelling units in Groups R-2, R-3 and R-4 within the following limits:
- Each pane of glass is 16 square feet (1.5 m2) or less in area.
- The highest point of the glass is 12 feet (3658 mm) or less above a walking surface or other accessible area.
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 ≤ PGPos | (Equation 24-14) |
Fgo ≤ PGNeg | (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. |
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 |
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 |
- Use is only permitted by the exception to Section 2406.2.
- For other than tempered glass, manufacturer's designations are not required, provided the building official approves the use of a certificate, affidavit or other evidence confirming compliance with this code.
- Tempered spandrel glass is permitted to be identified by the manufacturer with a removable paper designation
- Glazed openings of a size through which a 3-inch-diameter (76 mm) sphere is unable to pass.
- Decorative glazing.
- Glazing materials used as curved glazed panels in revolving doors.
- Commercial refrigerated cabinet glazed doors.
- Decorative glazing.
- Where there is an intervening wall or other permanent barrier between the door and glazing.
- Where access through the door is to a closet or storage area 3 feet (914 mm) or less in depth. Glazing in this application shall comply with Section 2406.4.3.
- Glazing in walls on the latch side of and perpendicular to the plane of the door in a closed position in one- and two-family dwellings or within dwelling units in Group R-2.
- The exposed area of an individual pane is greater than 9 square feet (0.84 m2);
- The bottom edge of the glazing is less than 18 inches (457 mm) above the floor;
- The top edge of the glazing is greater than 36 inches (914 mm) above the floor; and
- One or more walking surface(s) are within 36 inches (914 mm), measured horizontally and in a straight line, of the plane of the glazing.
- Decorative glazing.
- Where a horizontal rail is installed on the accessible side(s) of the glazing 34 to 38 inches (864 to 965 mm) above the walking surface. The rail shall be capable of withstanding a horizontal load of 50 pounds per linear foot (730 N/m) without contacting the glass and be a minimum of 11/2 inches (38 mm) in cross-sectional height.
- Outboard panes in insulating glass units or multiple glazing where the bottom exposed edge of the glass is 25 feet (7620 mm) or more above any grade, roof, walking surface or other horizontal or sloped (within 45 degrees of horizontal) (0.78 rad) surface adjacent to the glass exterior.
- A glass wall in a racquetball or squash court, or similar use subject to impact loads, shall remain intact following a test impact.
- The deflection of such walls shall not be greater than 11/2 inches (38 mm) at the point of impact for a drop height of 48 inches (1219 mm).
- The glass is bonded to a nonpolymeric coating, sheeting or film backing having a physical integrity to hold the fragments when the glass breaks.
- The glass is not subjected to further treatment such as sandblasting; etching; heat treatment or painting that could alter the original properties of the glass.
- The glass is tested to the acceptance criteria for laminated glass as specified for Class A in accordance with ANSI Z97.l or Category II in accordance with CPSC 16 CFR Part 1201.