Roof Plywood Needed

Unfortunately because the roof sheathing isn t normally visible damage can go unnoticed by homeowners.

Roof plywood needed.

Sometimes referred to as roof sheathing or a roof deck this plywood acts as a foundation for the layers of underlay and the shingles on your roof and connects the roof to the frame of the house. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. For example if your roof is 1 500 ft 2 then it will take 47 sheets of plywood to sheath it. The calculation is based on that the plywood or osb oriented strand board sheets are of a 4 x 8 size.

A standard sheet of plywood is 4 8. In this case a 4 8 sheet of plywood is 32 square feet. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. You just need to multiply the length by the width.

Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. Even though it isn t visible it is very important to the structure of your home. Rafters that are slightly farther apart might require inch or 5 8 inch thick plywood. It will support roof.

Gable roof sheathing calculator imperial estimate the amount of plywood or osb needed for sheathing a roof. One sheet 32 ft. 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. Keep in mind that the load of the roof still plays a role in the plywood thickness.

You need to measure your roof using a tape measure. It will be a good idea to get an extra few sheets of plywood when ordering to allow for waste and off cuts. How many square feet are there in a 4 8 sheet of plywood. This basically calculates the number of sheets needed for a gable roof.

When this is the case experts recommend a 5 8 inch thick sheet. The square footage of a hip roof area is identical to the square footage of a gable roof of the same measurements.