Is there any problem for the mortar to adhere to Redgard painted Hardie backer? Putting large wall tile 8"x8" on tub surround wall. What mortar is better?
Tile – RedGard and wall tile
tile
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Best Answer
There is no problem with thinset adhering to Redgard painted backer. Just make sure there isn't a vapor barrier installed behind the backer board or you'll trap in the moisture. Hopefully, you taped all the seams on the backer board. Use a fortified thinset. Let it set 5 to 10 minutes before applying. Set the tile and wait 24 hours before grouting. Good luck.