Roof Plywood Needed

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.

Roof plywood needed.

Keep in mind that the load of the roof still plays a role in the plywood thickness. The square footage of a hip roof area is identical to the square footage of a gable roof of the same measurements. One sheet 32 ft. Knowing this number can help you determine how many sheets of plywood you need for your roof.

A standard sheet of plywood is 4 8. For example if your roof is 1 500 ft 2 then it will take 47 sheets of plywood to sheath it. Gable roof sheathing calculator imperial estimate the amount of plywood or osb needed for sheathing a roof. 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.

Rafters that are slightly farther apart might require inch or 5 8 inch thick plywood. In this case a 4 8 sheet of plywood is 32 square feet. This basically calculates the number of sheets needed for a gable roof. How many square feet are there in a 4 8 sheet of plywood.

A 4 8 sheet of plywood is 32 ft 2. When this is the case experts recommend a 5 8 inch thick sheet. It will support roof. So dividing the area of the roof by 32 will give you the number of sheets needed.

For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. Unfortunately because the roof sheathing isn t normally visible damage can go unnoticed by homeowners.

The calculation is based on that the plywood or osb oriented strand board sheets are of a 4 x 8 size. You just need to multiply the length by the width.