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Old 04-15-2019, 07:11 PM   #1
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waterproofing shower pan to cement board


hey there.
i'm installing a frameless glass walled shower with fibreglass pan.
i attached the picture from the manual.
if i'm using waterproofing membrane for the cement board walls, how exactly do i waterproof the area of the pan that touches the walls? do i put a strip of the membrane along the whole shower pan that covers the whole seam?
thanks very much for the help!
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Old 04-16-2019, 05:06 AM   #2
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Re: waterproofing shower pan to cement board


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using waterproofing membrane for the cement board walls
What membrane are you using? You will set your CBU directly on the top lip of the pan, and any membrane you use will extend over it to the first ledge, as will your tile. The tile will jump the gap and will prevent wicking of water. Not sure if that answered your question or not.
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Old 04-16-2019, 06:30 PM   #3
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Re: waterproofing shower pan to cement board


great answer ty. we havent decided on membrane yet.
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Old 04-16-2019, 08:58 PM   #4
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Re: waterproofing shower pan to cement board


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Originally Posted by chandler48 View Post
What membrane are you using? You will set your CBU directly on the top lip of the pan, and any membrane you use will extend over it to the first ledge, as will your tile. The tile will jump the gap and will prevent wicking of water. Not sure if that answered your question or not.
in the picture from the manual, it shows the backerboard going all the way to the floor, then the pan backing into it. is this ok to do as well in terms of waterproofing and tiling?
couldnt you just silicone the tile wall to the shower pan flange?
thanks!
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Old 04-17-2019, 04:28 AM   #5
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Re: waterproofing shower pan to cement board


I wouldn't want to rely on caulking [which can fail] to keep water from getting behind/below the pan. As Larry said, the cement board needs to be above the pan so if water got back there it will still drain into the pan.
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