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Unread 12-06-2022, 10:01 PM   #1
Jonny Socko
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Join Date: Mar 2022
Posts: 2
CBU at the front of the tub

Hey guys,

I always run into issues where I'm trying to install skinny strips of cbu vertically on the walls that meet the front of the tub. The cbu is already only 2 inches and with acrylic tubs there is a flange that requires an inch to be removed or rabbetted to accommodate. The cbu always blows up when it has little integrity left. What's your trade secret for these finicky areas? I've tried finish nailing these pieces in before so the screws dont turn the cbu to trash. Wondering what creative solutions are out there.

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Unread 12-06-2022, 10:30 PM   #2
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Join Date: Nov 2006
Location: NW Arkansas, Ozark Mountains
Posts: 12,401
It's not something recommended by the manufacturer, or discouraged either, but I put some construction adhesive on it and use sheetrock nails to hold it in place.

If you're setting natural stone of any kind, I wouldn't use metal fasteners of any sort, due to the rust that could come through over time. In that case I'd find some way to temporarily secure the pieces til the adhesive dries.

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Unread 12-09-2022, 11:33 PM   #3
Tool Guy - Kg
Moderator -- Wisconsin Kitchen & Bath Remodeler
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Location: Oak Creek, WI
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I’m very similar to Kevin, except I use ring shank underlayment nails that are slightly thinner with a thinner head. In most cases, the board and these potentially rusting nails get some waterproofing over them.

Or, I’ll use my carbide hammer drill bits to run an over-sized pilot hole and use Hardibacker “Backer-On” screws. These exact screws have a head that more easily sinks into the surface of the cement board instead of cracking/splitting the cement board.

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