Can purple drywall be used in shower as base for tile?

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Posted by: from Sacramento
9/13/2018 at 11:03:48 PM

My contractor (general & licensed, CA) insists that purple drywall (Gold Bond Purple XP drywall is what he has stacked in the hall) can be used in the shower as the base for wall tile even though the manufacturer specs say it is not for wet areas. He wants to charge us more for using cement backer board.

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Date/Time9/14/2018 at 2:24:00 AM

You can't use purple or green board in shower area as a tile backing , i would recommend dent sheild or diamond board which are lighter and easier to work with compare to cement boards , and just pay him the difference , which would be $20 per sheet , usually u need 4 in each shower .

I personally wouldn't pay more for somthing that should be done right in the first place .

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Date/Time9/14/2018 at 7:46:54 AM

Yes, you can.

However, you need to use a system called Schlueter over that drywall in order to waterproof the shower. Purple or Green (as it's colored up here in Canada) is mould resistant which is why it is used in bathroom applications. Typically, green/purple drywall + Schlueter will be cheaper than using cement board and results in a superior product when applied correctly.

I would be speaking with your contractor to discuss exactly how they're intending on installing the tile in the shower, and more specifically, were I you, I would be educating myself on what the Schlueter system is prior to speaking with him so you go into the discussion forearmed.

Good luck with this.

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Date/Time9/14/2018 at 9:20:09 AM

Yes he can use that. Blue or purple drywall is "mold resistant" not water proof. He will need to use a water proofing membrane (there are several good systems) over that drywall. Cement board or Dense Shield is more expensive and I like to water proof over it anyways so you should pay more if that's what he uses.

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Date/Time9/14/2018 at 9:32:43 AM

Hello, Instead of Drywall use Perma Base Cement board behind tile in Showers and Tubs.

Because it's specially designed for the wet areas in bathrooms and kitchens it's hard durable, naturally moisture and mold resistant and won't rot, disintegrate or swell when exposed to water.

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Date/Time9/14/2018 at 10:25:33 AM

If the manufacturer says not for wet locations he must follow that or else he is likely any for damage and are correct, backer board is what should be used. It is your home and he is working for you. I would tell him that the project requires appropriate substrate and his suggestion is not appropriate. I would ask him if he bid the price with the intention of using the incorrect substrate. Is he calling for inspections? If so he will fail

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Dave from 360renos in Ottawa
Date/Time9/15/2018 at 7:34:01 AM

Hi Steve

Skip the drywall and install Schluter 1/2" kerdi boards. A 100% water proof system under your tiles when taped and mortared properly.

They come in 4x8 sheets. easier to lift and cut than cement board or drywall.




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Date/Time9/15/2018 at 10:51:45 AM

He should be using cement backer board. That should have been in the quote that he gave you. It is not wise to cut corners on renovations it will just cause problems in the future.

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Date/Time9/17/2018 at 9:05:00 AM

Okay let's use common sense here it doesn't matter what color drywall you use I don't care if it's made of gold if the tiling the grouting on the caulking job you will never have a problem never mind spending all this money on b*******sorry about the expression and stop watching the home and garbage television they're trying to take six month projects condensed them into 22 minutes with no mistakes and there's never a problem and there's an unlimited budget.

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