Roof Plywood Needed

The calculation is based on that the plywood or osb oriented strand board sheets are of a 4 x 8 size.

Roof plywood needed.

Roof sheathing thickness unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. One sheet 32 ft this basically calculates the number of sheets needed for a gable roof. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. If you mix thicknesses of plywood it will cause a problem eventually and the thicker sheathing will be noticeable probably within a month.

Finding the number of sheets of plywood needed for a floor wall ceiling or cabinet begins with finding the area that needs to be covered. For example if your roof is 1 500 ft 2 then it will take 47 sheets of plywood to sheath it. It will support roof. That s considered to be the minimum.

Rafters that are slightly farther apart might require inch or 5 8 inch thick plywood. Osb and plywood come in thicknesses ranging from 5 16 to 3 4 inch and the thickness needed for a particular roof depends on several factors including rafter spacing expected load and roof. Continue adding panels until the roof is covered. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb.

For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. 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. 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.

Metal roofing is also available in the form of shingles. So dividing the area of the roof by 32 will give you the number of sheets needed. With edge support and the same snow load 3 8 inch osb can be used. Find the square footage of each space and add together to find the total square footage needed.

A 4 8 sheet of plywood is 32 ft 2. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. 3 8 should be replaced optimally but it would be better to use all the same thickness sheathing than to mix them. Estimate the amount of plywood or osb needed for sheathing a roof.

Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. You may need to cut panels to fit angles using a circular saw with a metal saw blade. 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.