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Unread 04-20-2019, 10:44 AM   #14
Davy
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Join Date: Jan 2003
Location: Princeton,Tx.- Dallas area
Posts: 31,653
Henry, I usually hang the plywood over the edge of the cabinet a little, Kerdi board in your case, but that's up to you. Most of the time the side walls aren't exactly square with the front edge of the cabinet so the Kerdi board may have to be trimmed to fit. I would try to keep the back splash parallel with the front edge of the Kerdi board. If the back splash has a hump, I would mud on each side of it to make it flat. If it's real bad, the whole wall over the backsplash may need to be floated out.
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