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. 2012 IRC Table R802.5. Example: In the rafter time table beneath, the highlighted cell (13-0), indicates so 2' x 8' Douglas Fir rafter, including a rank of 2, spacing 24' split, can have a maximum span of 13 feet - 0 inches (13-0) if designed for a stay beladen of 20 psf, and. H C = Height of ceiling joists or rafter ties measured vertically above the top of the rafter support walls. The braces need to be supported to a bearing partition, as shown in one diagram higher. Also see Using These Tables and five Examples showing how to. For each application, a PDF download is available. These 46 tables are based upon design values for visually graded Southern Pine dimension lumber that became effective June 1, 2013. Note: Where ceiling joist s run perpendicular to the rafter, rafter ties shall be installed in accordance with Section R802.3.1. Tables listing Maximum Spans for Southern Pine joists and rafters are detailed below. For other grades and species and for other loading conditions, refer to the AWC STJR. (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. Rafter spans shall be measured along the horizontal projection of the rafter. The first span table is for roofs where the ceiling is not attached to the rafters (with no snow load), a live load of 20 Psf, a dead load of 20 Psf, and a deflection limit of L/180. (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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