picture of broken cement board corner i installed a cement board with a badly crushed corner. how should i proceed?

  • This is for a shower it will be waterproofed with redguard (or equivalent).
  • There is studs behind the screws on the right and left.

I don't know if its worth the effort (or if its even necessary) to patch this corner with new cement board.

  • i am planning on 1) just patching it with plain thinset other options are two 2) mix mud mortar into the thinset 3) try to cut out just this corner and fasten a patch of new board to the two studs shown in the picture 4)remove the whole board and start again
    – joe
    Commented Jul 23, 2017 at 3:14

1 Answer 1


Add mortar with either fiberglass or a kerdi membrane let set then add another layer of membrane to the corners as required for usual install.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.