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Unread 07-26-2019, 08:00 PM   #9
cx
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Join Date: Jul 2001
Location: Boerne, Texas
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4. For finishing the CBU you want to use a 2" alkali resistant fiberglass mesh tape. You can use an un-modified thinset mortar to fill the joints, but there is no reason not to use a modified mortar if that's what you'll have on hand to set your tiles.

5. Not sure what you might mean by "waterproof tape" there, but Custom makes a fiberglass mesh they recommend for use with RedGard in that application and that's what I'd recommend you use.

6. By the time you get to installing the wallboard you should already have installed your pre-slope of a minimum of 1/4" per foot from the drain to the farthest corner of the shower. The final mud bed over that liner should be of a consistent thickness of a minimum of 1 1/2 inches, following the slope of your waterproof liner and capturing the bottom of your CBU wallboard.

My opinion; worth price charged.
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