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 design.. Plywood is especially tricky to estimate, since prices vary so much from one grade to another. the following chart should give you a rough idea of what you'll have to spend for a typical 4x8 panel (sheet).. T1-11 plywood costs depending on the finish and size, this siding costs between $25 and $40 per 4 ft. by 8 ft. sheet. add installation costs and construction materials, and you end up with a range between $3.50 and $7.20 per square foot..
To find the amount of plywood needed to cover a roof start by finding the area of the roof. once the area is known, divide by the area of a 4
