I've installed wonderboard on the 3 walls of a tub/shower but I'm reading conflicting reports on how to cover the seams between the sheets. On the horizontal seams I'm using fiberglass mesh tape and modified thinset (the same thinset for attaching the tiles). I was going to do this then let it dry and then start laying tile but I'm also reading that I should not do this step before laying the tiles but at the same time?
The two inside corners are another issue. Treat these corners like the other seams (fiberglass mesh and thinset) or silicone caulk the corners. I know once the tile is set these corners should not be grouted and should be caulked but I'm not sure about the wonderboard inside corners. Thanks again.