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Old 10-23-2017, 08:02 PM   #2
Houston Remodeler
Pondering retirement daily

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Join Date: Oct 2009
Location: Houston Texas
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Welcome to the forum.

1- Are you 100% sure they are 1/2" boards? How many layers are each sheet? 1/2" (nominal) actually measures 7/16" or 15 /32's in real life. A stamp on the plywood will help.

2- The current plumbing code round these parts requires waterproofing at least 6 feet above the floor. Those tiled walls need to come down to get proper waterproofing in place.

3- Research the various surface applied membranes and decide which system you want to use. The sheet membranes are easier for the DIYer to use IMHO.

For when DIY isn't such a good idea...
Houston TX area Kitchen & Bath Remodeling
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