What is the preferred grade of plywood we should use as a subfloor underneath commercial-grade Vinyl Composition Tile (VCT) tile (not vinyl peel & stick tile).
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1 Answer
Basically any plywood will do. If I were doing it I would go with 3/4 inch. The key to a vinyl install install isn't the quality or depth of the subfloor but how flat it is. Any divots or seams bigger than 1/8" could have issues in the future and need to be filled.
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We will be using 3/4", but were told to get plywood with a completely smooth finish, without filled knots. Is this necessary, or will the filled knots be problematic in the future?– RETOct 2, 2014 at 0:57