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Question:

My cement board and surrounding drywall are different thicknesses?

the durock cement board is 1/2 inch and the drywall is 5/8 of an inch...So the shower wall is about an 1/8 of an inch recessed intothe wall. What can I do to fix the situation without redoing anymore walls. If I butt up the bullnose tile against the drywall about half of the tile's thickness sticks out...actually looks ok. I don't know if i should try to make a gradient from the drywall to the tile. There are also some gap between the two types of boards.....fill it with mortar?

Answer:

Yes you float it and float it back a bit on the durock. Use the same thinset mortar that you use for the tile. Never use a mastic as some hackers may suggest.Mastic is a water soluble product and will fail in a wet area such as a shower. What I do if the area permits is to put a pc of painters tape on the edge of the dry wall. Leave room for cement board tape. Then float the ares and pull off the painters tape and run the SBN over the durock tape edge and onto the dry wall just a bit to cover all and make a clean transition. Any questions you can e mail me through my avatar and check my qualifications there. GL
May 11, 2017
O.K. in this situation I will usually float this area , in other words the same way u float sheetrock , but I use mastic instead of gypsum compound.
May 11, 2017

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