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replacing water-damaged powder room subfloor

Posted by Texas10 on June 1st, 2009 09:32 PM

I have removed the section of water-damaged subfloor, comprised of 3/8" plywood base and 3/4" particle board to which the old tile was glued. I intend to replace the particle board with exterior grade 3/4" plywood, and cover the lot with Hardibacker board before retiling...

Now I see that two of the walls are no longer supported by a continuous 3/8" plywood sheet, since the walls run parallel to but between foor joists. These are obviously not load-bearing walls. One wall has the room's air conditioning vent coming up from below, and the other contains water lines and the plumbing drain vent.

When I replace the 3/8" plywood base, how should I provide nailing surfaces near the two unsupported walls, and what wall support is now required?

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