Plywood or OSB? The Smart Builder’s Guide to Walls, Roofs, and Subfloors
By Graham Mann | Published: 11/3/2025
Explore the pros and cons of plywood and OSB to make the best choice for your construction projects based on moisture resistance, cost, and durability.
Plywood or OSB? The Smart Builder’s Guide to Walls, Roofs, and Subfloors When choosing between plywood and OSB (oriented strand board) for walls, roofs, and subfloors, the decision often comes down to moisture resistance(https://diyecohomes.com/blog/difference-osb-plywood-air-tight-construction/), cost(https://diyecohomes.com/blog/osb-vs-plywood-diy-build/), and durability. Here’s the short answer: - Plywood costs more but resists moisture better, making it ideal for wet or humid environments like bathrooms or coastal areas. It’s also stronger for repeated fastening and holds screws well. - OSB is cheaper and works well in dry conditions. It’s a good option for budget-conscious projects but can swell on the edges when exposed to water. Quick Overview: - Plywood: Stronger, better moisture resistance, higher cost, made from mature trees. - OSB: Affordable, uniform, good for dry climates, made from fast-growing trees. If moisture is a concern, go with plywood. For cost savings in dry area...
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