Because I had to plumb a wall I had to sister the studs and that left me with two gaps in the corner like in the picture below. One corner is cement board(E) with existing cement board(D) , the other one is cement board(E) with existing drywall(D)
All the lumber is 2x4s:
D- existing drywall in one corner, the other similar corner has cement board
E -cement board that I am installing, not in place yet

A-existing stud
B-existing stud not plumb so I had to sister it using the stud C

Stud C is 3/8" off from B's inner edge

If I am installing E (cement board) as in the picture I will have two issues here:

  1. no support for the corner edge of E; that edge will still be screwed to C.
  2. there will be this empty space between the cement board that I do not know if it is OK to leave
    it there

What is the recommended way to deal with this?

enter image description here

  • I would just leave it alone. Once the corner of the drywall is adequately sealed, nothing shall be able to get into this space.
    – r13
    Sep 19 at 22:33
  • I was thinking about using mud or foam
    – MiniMe
    Sep 19 at 22:53
  • Both are fine if the space is accessible after placing the last stud.
    – r13
    Sep 19 at 23:00
  • E is not there yet so yes the space is accessible
    – MiniMe
    Sep 19 at 23:02
  • So no more problem then. Use the dry-pack that sticks better.
    – r13
    Sep 19 at 23:15

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