Us Roof Thickness

Plywood is often sold in 1 4 1 2 or 3 4 nominal thicknesses but the actual thickness is often 1 32 thinner.

Us roof thickness.

Approximate thickness in fractions of an inch. A flatter roof with rafters farther apart may need a thickness of up to inch. For example one company might sell a product as being 24 gauge but in reality the thickness of the metal could vary from 0 018 to 0 0335 based upon exactly how that company looks at things and how big of a tolerance they allow for. The same floor if framed with 2 by 12s will be 13 1 4 inches thick.

Weight per square foot in ounces avoirdupois. Weight per square foot in kilograms. Manufacturers in the united states use gauge to express the thickness of metal roof panels. Because the actual thickness may vary measuring the plywood is the only accurate way to determine its thickness.

Other types of shingles including number 1 wood cedar shake and tile are thicker although the thickness depends upon the individual brand of shingles you select. 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. The problem with metal roofing gauge is that there is a wide range of tolerances. Weight per square meter in kilograms.

It s important for you as a homeowner to know about the gauge thickness of a metal roof so you can select the best one for yourself. Standard asphalt shingles add very little thickness to the roof because a standard three tab shingle is about 3 16 inch thick. Roof sheathing thickness unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. A 1 2 sheet is actually 15 32 thick.

A 3 4 sheet is actually 23 32 thick. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. When installed however the shingles overlap doubling the thickness. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick.

When this is the case experts recommend a 5 8 inch thick sheet. Keep in mind that the load of the roof still plays a role in the plywood thickness. That s considered to be the minimum. Loads will vary with the.

22 gauge is the thickest while 29 gauge is the thinnest. Approximate thickness in decimal parts of an inch. Approximate thickness in millimeters. Some departments do not have the man power to do roof sheathing inspection inspectors can not see everything and assume that the builder knows enough to do some things right.

Total thickness when accounting for joist width subflooring flooring and standard ceiling drywall a floor framed with 2 by 10s will be very close to 11 1 4 inches thick. Weight per square foot in pounds avoirdupois.