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Unread 03-11-2015, 09:27 PM   #1
ShadowAngel
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Broken hardibacker corners?

Hello all. Doing a bathroom renovation and i've done most of the work myself. It's all come along very well, but tonight when getting the hardibacker onto the shower wall and getting it screwed into place, I had a couple of corners that broke. Is this something where I need to take it down and get a new piece, or do I just use thinset to patch the broken area and smooth it flat before putting on the waterproof membrane, or what? I'd hate to waste a whole sheet of backboard because of a couple of broken corners. Probably a stupid question, but...i'm trying to do this right! Any tips?
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Unread 03-12-2015, 12:33 AM   #2
Kman
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Depends on where those corners are, and how much is broken off.

Can you post a picture of the broken places?
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Unread 03-12-2015, 12:38 AM   #3
ShadowAngel
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I can try and do that tomorrow. It's the upper corners on either side of the first board I put up. So about 3 feet over the tub, and right by the walls. Not a huge crack or major broken pieces, but i'd say...1/2" to 3/4" of each corner is broken. I knew the directions not to screw within 1/4" of the edge of the board, but missed the one not to screw within 2" of a corner.
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Unread 03-12-2015, 10:14 AM   #4
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If they're on the back wall and only 1/2-3/4", then the boards on the side walls would cover them, or almost.
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Unread 03-12-2015, 01:52 PM   #5
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Here's the worst of them. That's actually the upper left edge off the back wall.
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Unread 03-12-2015, 03:18 PM   #6
jadnashua
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Humm...I do not see a vapor barrier behind the cbu!

Is the perpendicular wall going to get covered with cbu as well?
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Unread 03-12-2015, 03:49 PM   #7
ShadowAngel
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It is yes.and I didn't do a vapor barrier behind because I'm doing redgaurd on front for a waterproof membrane.
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Unread 03-12-2015, 04:00 PM   #8
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Is there any reason I couldn't fill in any gap that may be present with thinset before doing my final waterproofing layer assuming the rest of the backer board is well supported?
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Unread 03-12-2015, 05:24 PM   #9
jadnashua
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I'd consider using some thinset and then the mesh tape to anchor it in place.
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