I am having my bathroom renovated professionally. Is it okay to have a crumbled edge in the cement board that causes a small gap where it meets the tub? Or does it need to be replaced?
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A picture is worth a thousand words. And you don't have enough words to provide a good answer. – feetwet May 15 '15 at 0:18
That gap should be filled with grout or mortar first before the waterproofing (probably RedGard or some other paint-on rubber thing) is installed.
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