How Thick Is Roof Sheathing

The skeleton of a roof is formed with rafters or trusses generally spaced 16 inches or 24 inches apart from the center of one rafter to the center of the next.

How thick is roof sheathing.

Required sheathing thickness for roofing important factors. Common roof sheathing materials include several types which are chosen depending on the budget and weather conditions of the area. Plywood is made with three or more layers of thin wood glued together with the grain. 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.

Roof sheathing panel spacing hints. Plywood s advantage over osb. 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. That s considered to be the minimum.

Several factors must be considered when determining appropriate roof sheathing thickness such as the. Spacer type panel edge clips are available from some manufacturers. Maximum 19 percent moisture content. The greater ability a wall has to dry the more durable it will be and everyone.

An exception to this standard however may occur if you intend to install slate concrete or tile shingles on your roof. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood. Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick.

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. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7. 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. The minimum plywood for roofing plywood is layers of wood.

1 inch 25 4 mm. Many factors affect thickness.