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2404.2 Sloped Glass
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Glass sloped more than 15 degrees (0.26 rad) from vertical in skylights, sunrooms, sloped roofs and other exterior applications shall be designed to resist the most critical combinations of loads determined by Equations 24-2, 24-3 and 24-4.
The design of sloped glazing shall be based on Equation 24-5.
Fg = 0.6Wo — D
(Equation 24-2)
Fg = 0.6Wi + D + 0.5 S
(Equation 24-3)
Fg = 0.3 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) due to basic design wind speed, V, as calculated in Section 1609. |
| Wo | = | Outward wind force, psf (kN/m2) due to basic design wind speed, V, as calculated in Section 1609. |
| θ | = | Angle of slope from horizontal. |
Exception:
The performance grade rating of unit skylights and tubular daylighting devices shall be determined in accordance with Section 2405.5.
The design of sloped glazing shall be based on Equation 24-5.
Fg ≤ Fga
(Equation 24-5)
| where: | ||
| Fg | = | Total load on the glass as determined by Equations 24-2, 24-3 and 24-4. |
| Fga | = | Short duration load resistance of the glass as determined in accordance with ASTM E1300 for Equations 24-2 and 24-3; or the long duration load resistance of the glass as determined in accordance with ASTM E1300 for Equation 24-4. |
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