damage and repair
Subfloor Penetration — When Stains Go Too Deep
Pet urine or water damage that has soaked through the hardwood plank into the subfloor underneath.
Published
What it is
Subfloor penetration happens when pet urine or water damage reaches past the hardwood into the plywood or OSB subfloor beneath. Recoating, sanding, and oxalic acid cannot reach it — only board replacement plus subfloor treatment can fully resolve.
Why it matters for your wood floors
This entry is part of our complete glossary covering every term homeowners, realtors, and contractors encounter when dealing with wood floor cleaning, recoating, and refinishing. For full context, see our main guides on recoating, chemical abrasion, and the services we offer.
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