Do i need a membrane for my tub/shower? [Archive] - Ceramic Tile Advice Forums - John Bridge Ceramic Tile


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02-24-2008, 06:58 PM
Is it necessary to use a membrane when tiling a surround for my tub/shower. Can i simply use a cement board underneath instead or is there another way? I'm selling this house soon and don't want to spend much if I can help it. However, I'm not a jerk and do care if the new buyers have a leak down the road.

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Tool Guy - Kg
02-24-2008, 07:01 PM
Welcome, Scratcher.

While a membrane isn't a *must*, you need something. And that something is a moisture barrier. And a perfectly acceptable method is using a layer of roofing felt or poly behind the cement board as a moisture barrier. Drape the barrier down over the front of the tub's ledge, then secure your cement board to the studs. :)

02-24-2008, 07:03 PM
Yep, what Tonto said. Or if you already have the cement board up you can apply a layer of Redgard over the outside of it. :)

02-24-2008, 07:25 PM
Redgard is a fast and inexpensive way to do a waterproofing membrane
if the Cementboard is up.