Garage Roof Sheathing 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.

Garage roof sheathing thickness.

The thickness will range from 3 8 to 3 4 inch depending upon local code. Sheathing should be a minimum of 19 32 inch thick. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. In practice many builders default to 1 2 inch plywood even if they plan.

Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. 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. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. That s considered to be the minimum.

The inch thick boards extend from the eaves just past the exterior walls where they butt up against the plywood roof sheathing. If your roof is more on the flatter side then it s expected to have a heavier load. The typical thickness range for sheathing is 3 8 to 3 4 inch. If the nails penetrate the sheathing but not the studs the minimum plywood thickness that the irc designates is 1 2 inch.

Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should someone walk on the roof. Roof material then covers all. Loads will vary with the. Roof trusses when used shall be engineered and pre manufactured.

Roof sheathing may be 1 nominal thickness lumber 7 16 cdx plywood or other approved material. Never attach roof sheathing with staples. In the u s roof sheathing is almost always composed of wood usually osb oriented strand board or plywood. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.

Get free estimates from local roofing contractors. The thickness required by josh s circumstances are good for roof snow loads of up to 70 psf again spanning 24. 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. 8d ring shank nails should be used instead.