Roof Sheeting Thickness

The thickness of plywood used for roof decking depends on the roof slope the spacing of.

Roof sheeting thickness.

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. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood. Roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7. The inch thick boards extend from the eaves just past the exterior walls where they butt up against the plywood roof sheathing.

The minimum plywood for roofing plywood is layers of wood. Many factors affect thickness. Post frames generally lack structural sheathing so the roof and wall panels must span between the supporting trusses or purlins. Roof sheathing thickness unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick.

Most builder s use 7 16 osb with clips if a heavy roof covering applied or called for on plans. Because 22 24 or 26 gauge sheeting is thicker and will therefore remain more structurally sound over a longer span than a 29 gauge the building needs fewer supports which saves your customers money. Required sheathing thickness for roofing important factors. Roof material then covers all.

Uniform load deflection limitations 1 180 of span under live load plus dead load 1 240 under live load only. Several factors must be considered when determining appropriate roof sheathing thickness such as the. Plywood is made with three or more layers of thin wood glued together with the grain. 1 inch 25 4 mm 1 pound per square foot 0 0479 kn m2.