Plywood vs OSB
OSB costs 15–30% less and is structurally equivalent when dry. Plywood dries faster after getting wet and holds fasteners better at edges, which is why many builders still use it on roofs and in wet climates.
- • Leave a 1/8 in gap between sheets for expansion.
- • Glue and screw subfloor to eliminate squeaks.
- • Use exterior-rated adhesive and fasteners on sheathing.
FAQ
How many sheets of plywood do I need for 1,200 square feet?
About 42 sheets including a 10% waste allowance, since each 4×8 sheet covers 32 square feet.
How much does a sheet of plywood cost in 2026?
Commodity OSB runs roughly $28–40 per sheet and CDX plywood $40–60, with premium T&G subfloor above $55. Prices move weekly with the lumber market.
Is OSB as good as plywood?
For sheathing and subfloor in dry, properly detailed assemblies, yes — both meet the same span ratings. Plywood handles repeated wetting far better.
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