![]() ![]() FIGURE R802.5.1 BRACED RAFTER CONSTRUCTION TABLE R802.5. H R = Height of roof ridge measured vertically above the top of the rafter support walls. The loads are based on adjusted roof snow loads from the governing building code. Table 15.9 - Purlins on their flat in all wind zones up to 1.5 kPa snow load - SG 8. Table 15.8 - Verandah beams for all wind zones up to 1.5 kPa snow load - SG 8. Table 15.7 - Ridge beams for all wind zones up to 1.5 kPa snow load - SG 8. ![]() H C = Height of ceiling joists or rafter ties measured vertically above the top of the rafter support walls. Table 15.6 - Rafters for all wind zones up to 1.5 kPa snow load - SG 8. Note: Where ceiling joist s run perpendicular to the rafter, rafter ties shall be installed in accordance with Section R802.3.1. (Uninhabitable attics with limited storage, live load = 20 psf, L/Δ = 240) CEILING JOIST SPACING (inches)įor SI: 1 inch = 25.4 mm, 1 foot = 305 mm, 1 degree = 0.018 rad. The second stretch table is the same as the first, except that thereto assumes adenine ground snow ladung of 50 psf. (Uninhabitable attics without storage, live load= 10 psf, L/Δ = 240) CEILING JOIST SPACING (inches)Ĭheck sources for availability of lumber in lengths greater than 20 feet.įor SI: 1 inch= 25.4 mm, 1 foot= 304.8 mm, 1 pound per square foot= 0.0479 kPa.Ī. The first spanned table is for roofs where the slab is doesn attached to the rafters (with no snow load), a survive load of 20 psf, a dead load off 20 psf and a deflection limit of L/180. The inspector also doesnt seem to know what size rafters are wanted. I can find rafter span charts for up to 70 psf, but nothing higher. The building inspector says that the roof must be designed for a 90 pound snow load. Shall be in accordance with Tables R802.4(1) and R802.4(2).įor other grades and species and for other loading conditions,ĬEILING JOIST SPANS FOR COMMON LUMBER SPECIES I have run into an obstacle in getting my workshop design approved. ![]()
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