can you put backer board behind waterproof shower pan?
- Spock (rhp)Lv 72 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