Waterproofing Layer Between Plywood and OSB in Bathroom

Installing a waterproof barrier between plywood and OSB (Oriented Strand Board) in a bathroom is crucial for preventing moisture damage.


This barrier, often in the form of a waterproof membrane or sealant, helps protect the subfloor from water infiltration, which can cause swelling, rotting, and mold growth.


Proper installation and sealing of the barrier to maintain the integrity of the subfloor and prolong the lifespan of your bathroom flooring.

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