I would buy some new plywood You will be able to bad plywood thru the shingles... especially 20 year shingles.
Plywood is primarily used as a sheathing material in roofing applications to provide a stable base for roofing materials such as shingles or tiles.
The recommended plywood thickness for roofing is typically 3/8 inch to 3/4 inch, depending on the specific roofing material and local building codes.
To flatten warped plywood effectively, you can try placing the plywood on a flat surface and applying weight evenly across the surface. You can also try using moisture and heat to help the plywood regain its original shape.
For roofing, it is recommended to use exterior-grade plywood, specifically CDX plywood, which is durable and weather-resistant.
The recommended roofing plywood thickness for optimal durability and performance is typically 5/8 inch or 3/4 inch.
To effectively straighten warped plywood, you can try applying moisture to the concave side and weight to the convex side. This can help the plywood regain its original shape. Additionally, using clamps or heavy objects to hold the plywood flat while it dries can also help straighten it out.
The recommended thickness for 1/2 roofing plywood when constructing a new roof is typically 5/8 inch.
replace it
88 sheets of plywood provided that standard size sheets are used(4ft x 8ft)
1/2, 5/8, 3/4 depending on what it needs to do.
For roofing, it is recommended to use exterior-grade plywood that is at least 5/8 inch thick. This type of plywood is designed to withstand weather elements and provide a sturdy base for the roof.
For roofing, it is recommended to use exterior-grade plywood that is specifically designed for outdoor use. This type of plywood is more durable and weather-resistant, making it suitable for protecting the roof from the elements.