The plywood you use for roofing is typically 1/2-inch to 5/8-inch thick exterior-grade plywood or oriented strand board (OSB). This type of wood goes under your shingles or other roofing material to create a flat, strong base. Your roof needs solid plywood because it holds up your shingles, protects your home from weather, and keeps everything in place during storms. Most roofers choose plywood over OSB because it lasts longer and handles moisture better. The thickness and grade you pick depend on how far apart your roof’s support beams are and where you live.
What Grade of Plywood Works Best?
Use exterior-grade plywood or CDX plywood for roofing. This plywood has a waterproof glue that holds it together, even when wet. The “C” and “D” ratings mean the outside veneer layers have some knots and holes, but the inside is strong.
Never use interior plywood for roofing. It falls apart in rain and sun. Always buy plywood marked for outdoor use. Check the stamp on the wood to see the grade before you buy it.
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Thickness: 1/2 Inch or 5/8 Inch?
Most homes use 1/2-inch plywood. It is lighter and costs less. Use 5/8-inch plywood if your roof beams are far apart or if you live where it snows a lot. Snow adds weight, so thicker plywood keeps your roof from sagging.
Check your local building codes. Some areas require thicker plywood for safety. Your roofer knows what your area needs.
Osb or Plywood: Which Is Better?
Plywood is better than OSB for roofing. According to industry data, the average U.S. roof size is 2,647 square feet, and quality materials matter for that much area. Plywood holds its shape better when wet and lasts longer. OSB swells and warps when rain gets under your shingles.
Both cost about the same. Plywood is worth the extra durability. If a leak happens, your plywood roof takes longer to fail than OSB.
Cost and Installation
According to RubyHome, roof installation costs range from $4 to $40 per square foot. Plywood is usually $40 to $80 per sheet. A typical roof needs 10 to 20 sheets, so budget $400 to $1,600 just for plywood.
| Plywood Type | Thickness | Best For |
|---|---|---|
| Exterior CDX | 1/2 inch | Most homes |
| Exterior CDX | 5/8 inch | Snowy areas |
| OSB | 1/2 inch | Budget builds |
According to RubyHome, the average roof replacement cost is $9,526, with a range from $5,868 to $13,217. Plywood is just one part of that cost. Good plywood saves money later by lasting longer and keeping water out. When you hire a roofer, ask what grade and thickness they use. Your roof protects your home for 20 to 50 years, so pick quality plywood from the start.
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If you need help with your roof, reach out to a trusted roof contractor for clear pricing and reliable service.