![]() ![]() Height of roof ridge measured vertically above the top of the rafter support walls. Height of ceiling joists or rafter ties measured vertically above the top of the rafter support walls. Where ceiling joists or rafter ties are located higher in the attic space, the rafter spans shall be multiplied by the following factors: In this post we will learn how to correctly size a roof rafter based on its span, spacing and species of wood used. Since we are using metal roofing there is not much deal. Update from responses: roof is 1/8 pitch 8 ‘ off the ground near Houston (snow load is not a factor). Can I use a 2圆 for the rafters Could go 16 or 24' OC. The tin roof (lean-to) will run the 16' length. The plan was approved by city but now they are saying 6 ft spacing is not enough and least it can be is 4 ft. I'm building a goat shed - total size is 16' x 24'. ![]() We have 2X4 cross beams going across every 24 inches. The tabulated rafter spans assume that ceiling joists are located at the bottom of the attic space or that some other method of resisting the outward push of the rafters on the bearing walls, such as rafter ties, is provided at that location. Hello, We are in process of building a patio cover using metal sheets as covering. We’ll discuss 16 and 24 spacing, how to calculate the number of rafters required, 19.2 spacing, and the spacing when using metal roofing and for lean-to and porch roofs. (continued) TABLE R802.4.1(1)-continued RAFTER SPANS FOR COMMON LUMBER SPECIES (Roof live load = 20 psf, ceiling not attached to rafters, L/Δ = 180) RAFTER 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. In this guide, we’ll explain rafter spacing, code requirements, roof rafter span tables, and rafter spacing calculators. TABLE R802.4.1(1) RAFTER SPANS FOR COMMON LUMBER SPECIES (Roof live load = 20 psf, ceiling not attached to rafters, L/Δ = 180) RAFTER SPACING (inches) Loading conditions, refer to the AWC STJR. For other grades and species and for other metal roof shingles, mineral-surfaced roll roofing, slate and slate-type shingles, wood shingles, wood shakes, metal roof panels and photovoltaic shingles shall conform to the applicable standards listed in this chapter. Measured along the horizontal projection of the Based on the rafter spans in Tables R802.4.1(1) ![]()
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