Standard Roof Plywood Thickness

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

Standard roof plywood thickness.

However you might find that osb can better suit your needs than plywood for the roof. If you are not experienced you may measure a wrong thickness. You can use a caliper to measure the thickness as showing in above photo. 30 years on it s working out fine.

The thickness of plywood used for roof decking depends on the roof slope the spacing of rafters and the weight of other material to be put over the decking as well as the design load the. How many square feet are there in a 4 8 sheet of plywood. The typical thickness range for sheathing is 3 8 to 3 4 inch. Thickness tolerance is allowed in all plywood standards like iso us and european plywood standard jpic china plywood standard measuring the plywood thickness.

Chart represents most common plywood sheet sizes in inches imperial system and millimeters metric dimensions. Most of plywood sheets available in different thicknesses. Tolerance for utility grade thickness is 1 32 inch and for cabinet grade plywood 1 64 inch. Both cdx plywood and osb tend to come in standard sheets of four foot by eight foot 4 8.

The minimum thickness of plywood used for roofing is 3 8 th of an inch. A standard sheet of plywood is 4 8. 8d ring shank nails should be used instead. Never attach roof sheathing with staples.

Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Foot and with a maximum of spacing of 16 inches between rafters. Even though with all variation often 3 4 19 mm nominal 23 32 thickness tongue and groove. Plywood thickness for the roof.

Because of its construction some manufacturers actually make larger sheets of osb. The ideal thickness for the standard rafter spacing of 24 inches is 5 8 th of an. Its size tolerances especially for thickness are smaller that those for the utility grade plywood used in the building trades for roof and wall sheathing subfloors and general use purposes. This kind of plywood can be used on roofs with minimal load.

Softwood plywood typically used for rough framing comes in 4 x 8 feet 1220 x 2438 millimeters sheets. Steeper rather than flatter roofs will have lesser load per sq. In the photo the caliper reads 17 75mm. If the roof dips here and there because of the thin plywood the 1 8 jump may no be so bad in the mix of it all jack jul 26 16 at 4 24 here in snow country 1 2 osb is standard with 7 16 being common for walls.