![]() ![]() FIGURE R802.5.1 BRACED RAFTER CONSTRUCTION TABLE R802.5. CZ2 so a vapor diffusion port makes air permeable insulation at the rafter line possible and to code. Rafter Ties are necessary if you want to build hipped roofs because they support by reducing the tension between the roof and the structure. H R = Height of roof ridge measured vertically above the top of the rafter support walls. The valley rafter span is approximately 19. The roof slopes are about 8: 12 and 6: 12, so the hip is not quite at a 45. The perpendicular wing is 24 deep, so the rafters span 12 feet. Dormer Rafter Definition of Dormer Rafter a rafter whose upper end rests atop an existing roof without cutting into it, providing a roof and ceiling for a dormer or building space with greater head-room than beneath the main roof. TTK et al, The width of the main part of the house is 28 feet, so the rafters span 14 feet from wall to ridge. ![]() H C = Height of ceiling joists or rafter ties measured vertically above the top of the rafter support walls. The valley itself is formed where the hip roof abuts a lower or adjoining roof surface. Note: Where ceiling joist s run perpendicular to the rafter, rafter ties shall be installed in accordance with Section R802.3.1. It is unnecessary to perform any type of analysis before placing collar ties on a roof. (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. (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. 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 ![]()
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