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Roofing felt under cement board on exterior walls?

jonkovach's Avatar

Join Date: Jun 2004
Posts: 65

02-24-10, 09:41 AM   #1  
Roofing felt under cement board on exterior walls?

Hi all,

I am remodeling my bathroom, installing tile around a tub surround and on the floor. I am going to put 15-lb. roofing felt under my cement board (hadibacker) on the walls, and I heard that you should put polyethelene behind the cement board on any outside walls. Can I just use the roofing felt on that outside wall, or are they completely different?

Also, is it recommended to install roofing felt under the cement board on the floor?


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Robbie2734's Avatar

Join Date: Mar 2009
Posts: 7

02-24-10, 11:31 AM   #2  
I'd use GRACE rubber membrane and let it continue up the wall above the cove so your floor is waterproof underneath.

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