Garage Roof Sheathing Thickness

The inch thick boards extend from the eaves just past the exterior walls where they butt up against the plywood roof sheathing.

Garage roof sheathing thickness.

That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. 8d ring shank nails should be used instead. Loads will vary with the. Sheathing should be a minimum of 19 32 inch thick.

For heavier loads a 40 20 rated panel 19 32 or 5 8 will support a 130 psf live load and 48 24 rated panels 23 32 or are good to175 psf. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Roof trusses when used shall be engineered and pre manufactured. Never attach roof sheathing with staples.

If your roof is more on the flatter side then it s expected to have a heavier load. Roof sheathing may be 1 nominal thickness lumber 7 16 cdx plywood or other approved material. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. 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. The thickness will range from 3 8 to 3 4 inch depending upon local code. The typical thickness range for sheathing is 3 8 to 3 4 inch. Roof material then covers all.

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. Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should someone walk on the roof. The thickness required by josh s circumstances are good for roof snow loads of up to 70 psf again spanning 24. In practice many builders default to 1 2 inch plywood even if they plan.

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. Roof sheathing or decking is one of those elements. That s considered to be the minimum. If the nails penetrate the sheathing but not the studs the minimum plywood thickness that the irc designates is 1 2 inch.