Code of Massachusetts Regulations
780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS
Chapter 24 - Glass and Glazing
Section 2404 - WIND, SNOW, SEISMIC AND DEAD LOADS ON GLASS
Subsection 2404.3 - Wired, patterned and sandblasted glass
Current through Register 1531, September 27, 2024
2404.3.1 Vertical wired glass. Wired glass sloped 15 degrees (0.26 rad) or less from vertical in windows, curtain and window walls, doors and other exterior applications shall be designed to resist the wind loads in Section 1609 for components and cladding according to the following equation:
| Fgw < 0.5 Fge | (Equation 24-6) |
where:
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.
2404.3.2 Sloped wired glass. Wired glass sloped more than 15 degrees (0.26 rad) from vertical in skylights, sunspaces, sloped roofs and other exterior applications shall be designed to resist the most critical of the combinations of loads from Section 2404.2.
For Equations 24-2 and 24-3:
| Fg < 0.5 Fge | (Equation 24-7) |
For Equation 24-4:
| Fg < 0.3 Fge | (Equation 24-8) |
where:
Fg = Total load on the glass.
Fge = Nonfactored load from ASTM E 1300.
2404.3.3 Vertical patterned glass. Patterned glass sloped 15 degrees (0.26 rad) or less from vertical in windows, curtain and window walls, doors and other exterior applications shall be designed to resist the wind loads in Section 1609 for components and cladding according to the following equation:
| Fgw < 1.0 Fge | (Equation 24-9) |
where:
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.
2404.3.4 Sloped patterned glass. Patterned glass sloped more than 15 degrees (0.26 rad) from vertical in skylights, sunspaces, sloped roofs and other exterior applications shall be designed to resist the most critical of the combinations of loads from Section 2404.2.
For Equations 24-2 and 24-3:
| Fg < 1.0 Fge | (Equation 24-10) |
For Equation 24-4:
| Fg < 0.6Fge | (Equation 24-11) |
where
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.
2404.3.5 Vertical sandblasted glass. Sandblasted glass sloped 15 degrees (0.26 rad) or less from vertical in windows, curtain and window walls, doors, and other exterior applications shall be designed to resist the wind loads in Section 1609 for components and cladding according to the following equation:
| Fg < 0.5 Fge | (Equation 24-12) |
where:
Fg = Total load on the glass.
Fge = Nonfactored load from ASTM E 1300. The value for sandblasted glass is for moderate levels of sandblasting.
