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Unread 06-07-2011, 03:30 PM   #1
Join Date: Jun 2011
Posts: 2
Tile over plaster walls

I am redoing my bathroom, and am replacing the old shower tile with new mosaic porcelain tiles, when I removed the old ceramic tiles the thin coat on two of the walls was cracked and in bad shape. I removed the old thin coat mortar and patched the base coat (base coat is mesh wire over wood studs cir 1958).
My question is: What do I need to do to prep the old plaster for the new thin coat/ tiles?
The old plaster looks like it has some kind of moisture barrier between the plaster and thin coat, it is a dark yellow/brown thin painted coat. Can I just smooth out the old base coat, and roll on a new moisture barrier, then put the tile up using a cement based thin set mortar.
I am not sure that the thin set will stick to the moisture barrier.
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Unread 06-07-2011, 09:08 PM   #2
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Hi JB, welcome! You will need a waterproofing membrane or a roll on membrane on the walls. You should remove the plaster area around the shower and put up CBU with a vapor barrier or dry wall with Kerdi.
Musky Mike
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Unread 06-08-2011, 10:00 AM   #3
Join Date: Jun 2011
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Thanks Mike, That sounds like the best plan. The CBU with a
moisture barrier will be much easier to work with anyway.
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