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Subfloor: The Hidden Layer Beneath Your Flooring

Definition

The subfloor is the structural layer of flooring nailed or screwed directly to the floor joists. In most Pacific Northwest homes, it's ¾-inch tongue-and-groove plywood or OSB.

Also known as: subfloor deck, rough floor, structural floor

Common Questions

Real-World Example

You'd see this when a homeowner in Washougal, WA has CRM Services install new LVP flooring and the crew discovers a soft spot near the dishwasher.

Why It Matters

Directly relevant to any flooring project.

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