can you put backer board behind waterproof shower pan?

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  • 2 months ago

    if you mean the cement backer board used behind tile, yes -- i've seen that done.  and when the shower pan or plumbing develops a leak, the backer board crumbles.  I've also seen 3/4 inch CDX plywood used.  Marine plywood would work better, but is terrible expensive.

    Source(s): grampa
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