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Unread 08-14-2004, 07:24 AM   #1
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Join Date: May 2004
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Would someone please tell me which method is proper when laying a mortar base in a shower. Do I leave a 1/4" gap between the vertical cement board or do I let it contact the vertical cement board. I have read postings where both methods are correct. Thanks for the help.

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Unread 08-14-2004, 07:31 AM   #2
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Hi Matt,
It's very important to not penetrate the liner with nails all around the bottom of the shower, you need to leave the nails up at least a couple inches higher than your finished curb. Problem is now that the bottom of the CBU is flapping in the wind. By packing the mud up tight to the CBU, it is locked in place at the bottom without nails. You do however leave a small vertical gap at the very bottom -- the CBU shouldn't go all the way down & touch the liner.
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