This is around a tub/shower. The studs are spaced at 24in, cement board is 1/2in.
We're surprised at how much flex there is between the sheets of cement board. I'm worried that tiles may pop off.
We're planning to use 12in floor tiles on the wall.
Some options I've considered:
Leave it. It's fine.
Aim the tile grout lines at the seams of the cement board. Flex won't affect whole tiles.
Add blocking behind the seam. PITA.
Add another layer of cement board, maybe 1/4", shifted over so the seams don't overlap.
What should I do? If anything.