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Unread 01-30-2021, 10:22 AM   #5
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Join Date: Oct 2016
Location: Central Virginia
Posts: 535
You can build the bench with 2x4 or similar lumber and use KerdiBoard as you describe. I also couldn’t find the 2” stuff by me, so went with 3/4 ply for the top and above that 1/2” drywall and just drywall for the sides. Kerdi over the whole thing and tie in with the floor and walls. Make sure you’ve got some slope to the top.
Also, if you’re using the foam tray, the bench structure goes right on to the floor before the tray. If on top of the tray, it will crush down and be unstable; not what you want. It will leave the bottom perimeter around the bench angled to the floor, so some careful measuring and cutting is need. Certainly doable.
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