Garage Roof Sheathing Thickness

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.

Garage roof sheathing thickness.

Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should someone walk on the roof. Roof material then covers all. For the curious 7 16 osb has a span rating of 24 16 and with supports every 24 inches is good for a roof live load of 40 psf pounds per square foot with a 10 psf dead load. In the u s roof sheathing is almost always composed of wood usually osb oriented strand board or plywood.

Loads will vary with the. Roof sheathing or decking is one of those elements. 8d ring shank nails should be used instead. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick.

Get free estimates from local roofing contractors. In practice many builders default to 1 2 inch plywood even if they plan. When ordering the sheathing divide the total number of square feet of roof surface by 32 square feet a 4 x 8 panel and add an extra 15 for waste. Never attach roof sheathing with staples.

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. If the nails penetrate the sheathing but not the studs the minimum plywood thickness that the irc designates is 1 2 inch. Sheathing should be a minimum of 19 32 inch thick. The thickness required by josh s circumstances are good for roof snow loads of up to 70 psf again spanning 24.

Roof sheathing may be 1 nominal thickness lumber 7 16 cdx plywood or other approved material. The thickness will range from 3 8 to 3 4 inch depending upon local code. That s considered to be the minimum. If your roof is more on the flatter side then it s expected to have a heavier load.

Roof trusses when used shall be engineered and pre manufactured. 7 16 plywood or similar with span rating of 24 0 supported on 24 centers requires h clips on all horizontal joints centered in each rafter bay. The inch thick boards extend from the eaves just past the exterior walls where they butt up against the plywood roof sheathing. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads.