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Unread 03-12-2004, 02:47 PM   #1
Dave the rave
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tiling over drywall

I'm kind of new in this business.

These people want me to tile a shower wall over what appears to be drywall or blueboard. There is old tile on it now, in very good shape. They just want to change the tile. They say they don't care about durability because they don't plan on living there for more than a couple more years.

What to do. Professionally speaking, I should insist on backerboard, a waterproofing membrane, etc. But they want to keep the cost down.

I'm afraid if I do what they want, the whole thing will collapse or leak. But the tiles up there now look fine.

Can I roll a waterproofing membrane over the drywall? Will it stick?
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Unread 03-12-2004, 03:22 PM   #2
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If your planning on removing the old tile, you might as well use a big hammer and hang new board>cement board is the way to go and meets industry guidlines.I dont think I would hang two layers of tile off dry wall.If they say they dont care how long it last get a release in writing!!!!
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Unread 03-12-2004, 05:22 PM   #3
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Welcome, Dave.

What Eric said.

Hellofa lot easier to take down the whole wall than to try to chip the tile off without damaging it. But then you hafta consider the pan. I assume they're not gonna wanna do a new pan. Tricky bidness, that.

Just because the tile looks good from the outside doesn't mean the sheetrock isn't already damaged to some extent, anyway. I'd 'splain to them that it will likely cost more to try to save their sheetrock walls than to remove and replace them.

What sort of shower pan are you dealing with - if you know?
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Unread 03-12-2004, 05:34 PM   #4
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Hi Eric and CX,
thanks for the replies. this forum is amazing. I'm learning at a quantum leap every freaking five minutes.

There is no shower pan. It's a tub with a shower head on the wall.

Originally I balked at the idea of trying to save the wall. Now I'm really balking. I did tell them that backerboard might be necessary if the wall is damaged. Well....that could be arranged.

Does every shower enclosure need a membrane?

dave
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Unread 03-12-2004, 05:42 PM   #5
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I know what you mean..Its hard to believe that CX and I have only been doing it for a little over a week!!
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Unread 03-12-2004, 05:45 PM   #6
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Hell, if it's a tub surround, it's a slam-dunk, Dave, tear the damn walls out and install CBU. You'll save them money and give them a good job at the same time.

Yes, you'll need to install 4 or 6 mil poly over the studs before you install the CBU. Or you can use roofing felt. I think poly is easier, but some guys like felt better. Gotta lap over the flange of the tub. Eez easy.

It's also possible you could remove the tiles if they wanna fall off real easily, then install poly and CBU over the sheetrock and use mudcap trim on the edges. Then it'll look like a mud shower and you can lie on your resume'.

Hafta make sure you have enough reveal all around the tub before you try that, though.

My opinion; worth price charged.
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Unread 03-12-2004, 05:47 PM   #7
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You sleeping at the hoiliday inn express again?
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Unread 03-12-2004, 06:30 PM   #8
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If they're worried about the cost, tell them that the cost will be about the same either way, considering all the time you're going to have to spend being careful not to destroy the existing wall board when you take down the existing tile, and even then there are no guarantees. They'll wise up pretty quickly.
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Unread 03-12-2004, 06:41 PM   #9
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Okay, thanks guys, this really helps.

I appreciate the spirit of this group.
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Unread 03-12-2004, 06:57 PM   #10
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Howdy Dave. Welcome aboard.
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Unread 03-12-2004, 09:54 PM   #11
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I'm honored to be in the company of the mudmeister!
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Unread 03-12-2004, 10:12 PM   #12
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Sorry, Eric, I'm too dense for the Holliday Inn comment tonight, you're gonna hafta 'splain me.
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Unread 03-13-2004, 06:53 AM   #13
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I think they're going to spring for the durock. I'm only going to charge them for the labor of bringing it into the building since the work will actually be easier now.


One more question. When using poly as waterproofing under the durock on the wall, what does one use to anchor the bottom of it to the lip of the bathtub? Roofing cement?

And is tar paper a better choice?
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Unread 03-13-2004, 08:27 AM   #14
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Don't need to anchor it to the tub, Dave, just let it hang over a couple inches while you install the CBU, then trim it off.

Roofing felt is also adequate to the task, but not necessarily a better choice. Some guys prefer it, some don't. Makes a lump where it overlaps is the only thing I have against it for hanging CBU. I've never actually done that, mind you, just seems to me like it could be a hassle that you don't have with poly. If you were floating mud, I'd make no distinction betwix them twa.

My opinion; worth price charged.
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Unread 03-13-2004, 01:53 PM   #15
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