Roofing felt under cement board on exterior walls?


Old 02-24-10, 09:41 AM
Thread Starter
Join Date: Jun 2004
Location: Butler
Posts: 65
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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Old 02-24-10, 11:31 AM
Join Date: Mar 2009
Posts: 7
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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