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Urgent: Durock cememt board next gen for bathroom around tub - Do I need membrane?

I am doing a bathroom remodeling. My contractor uses Durock cement board Next Gen around the tub. We plan to have tiles (12" x 24") installed around the tub. My contractor assured me over and over that I don't need to use membrane. He said he has done it for 10 years. There has never been any problem. But I've done some internet search. Many websites seem to suggest that membrane should be used, especially around the shower area. Not sure if I should insist that he uses membrane. Any advice?

dj1
Re: Urgent: Durock cememt board next gen for bathroom around tub - Do I need membrane
dj1

Tell your contractor that you insist on it, and give him a choice: Either put a 6 mm plastic behind the cement boards OR apply RedGard waterproofing. Fair enough?

Either way, it must be done correctly, or you will have a leak, or two, into the wall.

To educate yourself better, watch GorgiaTileMaster on youtube.

Re: Urgent: Durock cememt board next gen for bathroom around tub - Do I need membrane

Thank you so much for the quick response. To be fair, he did use some kind of mesh tape and thin set to seal the edges and seams of the cement board. He said that's very sufficient. But I thought Redgard should be applied to the entire surface, not just the seams.

HoustonRemodeler
Re: Urgent: Durock cememt board next gen for bathroom around tub - Do I need membrane
HoustonRemodeler

Cement board is NOT waterproof.

You need a membrane somewhere.

You need a new contractor.

That GaTileGuy makes some serious mistakes. I would not follow his advice. For the finest in tile and remodeling information, head on over to the John Bridge Tile Forum.

Re: Urgent: Durock cememt board next gen for bathroom around tub - Do I need membrane

Thanks for the confirmation. It's very helpful.

Re: Urgent: Durock cememt board next gen for bathroom around tub - Do I need membrane

Thanks both of you for your advice. I am really glad that I've insisted on the Redgard. Having observed their process, I would have regretted big time if I didn't have the Redgard put on. Thank you so much.

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