Roof Plywood Thicknesses Mixed

Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb.

Roof plywood thicknesses mixed.

Plywood is often sold in 1 4 1 2 or 3 4 nominal thicknesses but the actual thickness is often 1 32 thinner. The standard width is 4 feet. It will support roof. Because the actual thickness may vary measuring the plywood is the only accurate way to determine its thickness.

Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. A 1 2 sheet is actually 15 32 thick. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. 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.

Rafters that are slightly farther apart might require inch or 5 8 inch thick plywood. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. 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. Exposed fastener corrugated steel roofing.

With edge support and the same snow load 3 8 inch osb can be used. 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. You can get plywood sheets with a length of up to 10 feet.

It s the standard for spacing of 24 inches in the rafter although as mentioned a 5 8 inch thick is more ideal. You might be tempted to choose a inch thickness although it s unnecessary in most cases.