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Old 10-21-2013, 07:26 PM   #16
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My contractor is off today and I took a closer look at the shower pan installation. If you look at the photo which shows the corner of the shower, you can see the dark shiny wall, which is the cement board with the roll-on membrane. The dark gap between the white shower pan and the cement board is a hole through which I can stick my fingers into the empty wall. The contractor was supposed to have extended the cement board down to at least the top of the shower pan flange. He did this on the right side and then covered the left side with a cloth tarp when he left.

I know that the contractor's plans are to have the tile guy stuff lots of thinset in this gap. To my mind, this is shoddy work and will result in a leak. To top it off, this is right over the new kitchen we are installing.

I would welcome words from professionals that I am both wrong and nitpicking, and that the contractor's installation is perfectly fine. Thanks again for all the helpful advice.
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Old 10-24-2013, 11:12 AM   #17
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That's how I just installed mine. The tile got thinsetted to the cement board, the very bottom tiles extended down past the cement board to within a 1/8" of the shower pan, then the tile gets a small bead of silicone between it and the shower pan. I didn't thinset the tile where it extends past the cement board.
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Old 10-24-2013, 11:18 AM   #18
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Here's a quick sketch from when I was asking the very same question.

http://s147.photobucket.com/user/d18...WER-2.png.html
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Old 10-25-2013, 03:13 PM   #19
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Quote:
Originally Posted by d189379 View Post
Here's a quick sketch from when I was asking the very same question.

http://s147.photobucket.com/user/d18...WER-2.png.html
I looked at your sketch and I don't see any waterproofing. I'm not a contractor, but I have been all over the web and it is almost unanimous that a waterproof membrane needs to be put over the cement board. From what I have read (extensively), cement board, thinset, grout, tile and grout sealer are not considered waterproof. Our existing shower was done according to your sketch and when the old cement board was removed, there was rotting and black mold on the lower studs and the tile shower pan was an absolute mess.
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Old 10-28-2013, 01:18 PM   #20
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Quote:
Originally Posted by longislander2 View Post
I looked at your sketch and I don't see any waterproofing. I'm not a contractor, but I have been all over the web and it is almost unanimous that a waterproof membrane needs to be put over the cement board. From what I have read (extensively), cement board, thinset, grout, tile and grout sealer are not considered waterproof. Our existing shower was done according to your sketch and when the old cement board was removed, there was rotting and black mold on the lower studs and the tile shower pan was an absolute mess.
I only posted it to show the detail of the tile at the shower base. No need to worry, the shower was waterproofed, it just didn't show up on the sketch.
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Old 11-01-2013, 01:36 PM   #21
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Thanks again for all the advice. The shower is now tiled and it looks great. We'll cross our fingers that it lasts for the length of time we are in this house.

Meanwhile, we need to install a bathroom fan and are a little flummoxed as to venting since our HOA board has some restrictions. (We are asking for permission to do a roof vent.) My contractor suggested we could simply vent the moist air into the attic, giving me even greater confidence that he knows what he's doing.
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