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How thick is roof sheathing. Panel thickness will also affect permeability using the 2 perm variable of 7 16ths osb sheathing at 3 4 thickness the permeability drops to 2 3rds of a perm. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood. To stabilize the rafters support the roofing material and hold the entire roof together roof sheathing is installed. Several factors must be considered when determining appropriate roof sheathing thickness such as the.
The thickness of plywood used for roof decking depends on the roof slope the spacing of. An exception to this standard however may occur if you intend to install slate concrete or tile shingles on your roof. Standard roof sheathing which consists of 4 by 8 sheets of plywood or oriented strand board or osb is 1 2 inch thick and attaches directly to the roof rafters or the roof trusses. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7.
Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively. Roof sheathing panel spacing hints. Required sheathing thickness for roofing important factors. That in a nutshell is the one big advantage plywood holds over osb.
Plywood s advantage over osb. The minimum plywood for roofing plywood is layers of wood. That s considered to be the minimum. Maximum 19 percent moisture content.
Common roof sheathing materials include several types which are chosen depending on the budget and weather conditions of the area. Use a 10d box 0 128 inch by 3 inch nail as a spacer to gauge 1 8 inch edge and end spacing between panels. This minimum will only work if the rafters are set 16 inches apart at most and if the roof doesn t have too much load. Spacer type panel edge clips are available from some manufacturers.
Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Many factors affect thickness.
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