Drywall Repair with Hardibacker

[tev9999]

I installed a new bathroom vanity and in place of the medicine cabinet that was recessed I am going to use a flat mirror. The vanity is 36" and an off the shelf 36" X 30" frameless mirror from HD is what I plan on installing. The only problem is that the hole from the old cabinet extends about one inch to the left of the vanity, and I want the mirror directly centered, so I will have to repair the drywall. I've got some hardibacker board laying around already. Would there be an issue using this instead of green board for the repair? I was going to install a frame inside the opening from 2X2s to mound the board to, then tape and finish the right side. Any problems with this cracking later with the hardibacker to greenboard transition?

[Mikepier]

As long as the thickness of the hardibacker is the same as the greenboard, I don't see a problem with doing that.

[Bill Gill]

I just repaired the wall behind the washing machine using hadibacker. It looks just fine.

I repaired the wall because the drain overflowed and damged the wall. When I got the drain replaced I decided to use the hardibacker I had because if it ever overflows again it will standup to the water.

Bill Gill