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Old 11-06-2008, 10:02 PM   #1
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isolation membrane on plywood

is it necessary to use an isolation membrane over a plywood subfloor in a bathroom porcelain tile installation?

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Old 11-07-2008, 05:47 AM   #2
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isolation membrane on plywood

It isn't necessary but it's highly recommended. I never like to install ceramic directly onto any wooden substrate. I've seen too many problems as a result.

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Old 11-08-2008, 08:10 PM   #3
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isolation membrane on plywood

Use Ditra, it works as isolation and uncoupling membrane.

Nac Tac makes a good isolater.

I would suggest installing ceramic over wood with Ditra or a CBU.
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Old 11-08-2008, 09:40 PM   #4
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isolation membrane on plywood

I agree. Installing tile direct to a wooden subfloor, (has to be double layer), can work, but is not recommended by any pro that knows his/her business. It should never be done where dampness can occur, such as a bathroom. I also recommend either a tile backer or Ditra. Ditra is my first choice, use it if you may get it in the amount you need?

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