Roof Plywood Thicknesses Mixed

A 3 4 sheet is actually 23 32 thick.

Roof plywood thicknesses mixed.

The standard width is 4 feet. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. Plywood is often sold in 1 4 1 2 or 3 4 nominal thicknesses but the actual thickness is often 1 32 thinner. When this is the case experts recommend a 5 8 inch thick sheet.

With edge support and the same snow load 3 8 inch osb can be used. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. You can get plywood sheets with a length of up to 10 feet. A 1 2 sheet is actually 15 32 thick.

Exposed fastener corrugated steel roofing. You might be tempted to choose a inch thickness although it s unnecessary in most cases. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. It will support roof.

Please understand that recommended metal thicknesses will vary based on the design and engineering of the metal product being considered that said here are a few general recommendations. It s the standard for spacing of 24 inches in the rafter although as mentioned a 5 8 inch thick is more ideal. Because the actual thickness may vary measuring the plywood is the only accurate way to determine its thickness. Rafters that are slightly farther apart might require inch or 5 8 inch thick plywood.

Metal roofing thickness recommendations that include paint. Sheets of 7 16 inch thick with no edge support can be used in an area where the snow load is 30 pounds per square foot.