Roof Plywood Thicknesses Mixed

The standard width is 4 feet.

Roof plywood thicknesses mixed.

For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. Because the actual thickness may vary measuring the plywood is the only accurate way to determine its thickness. 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. You can get plywood sheets with a length of up to 10 feet.

It will support roof. Metal roofing thickness recommendations that include paint. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. Keep in mind that the load of the roof still plays a role in the plywood thickness.

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. When this is the case experts recommend a 5 8 inch thick sheet. 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.

You might be tempted to choose a inch thickness although it s unnecessary in most cases. A 1 2 sheet is actually 15 32 thick. Rafters that are slightly farther apart might require inch or 5 8 inch thick plywood. It s the standard for spacing of 24 inches in the rafter although as mentioned a 5 8 inch thick is more ideal.

With edge support and the same snow load 3 8 inch osb can be used. A 3 4 sheet is actually 23 32 thick.