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Question:

Can I use 1/2 cement board over 1/2 plywood subfloor?

I want to install ceramic tile in my kitchen. My subfloor consists of 2x8 on 16 centers with 1/2 5 ply plywood. Will it be OK to lay 1/2 cement board directly on this or do I need to some how increase the strength of the subfloor? Any recommendations.

Answer:

you could do that and MAYBE not have a problem. but if it was me, the 1/2 would come out and 3/4 would replace it. i have done a few jobs for people that dont want to replace the 1/2 and didn't have any problems with the tile or grout lines cracking. its just up to you really. if there is ANY give at all on you floor right now, id replace the 1/2.
May 11, 2017

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