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Old 06-27-2018, 08:26 PM   #1
Atomic21
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Kerdi board on stacked 2x4 curb

Hi there, Im looking at a mud pan shower, with a curb constructed of 3 stacked 2x4's on a wooden subfloor. My plan is to use kerdi board on the sides, but wanted to confirm if its ok to use kerdi board on the top.

Then seal any of the screw penetrations with kerdi, and then thinset to eventually bond the granite cap?
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Old 06-27-2018, 08:32 PM   #2
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Yes, fine to use on top. But you have to address the seams between the sides and top pieces, not just the screw penetrations. By the time you get the required 2” overlap, you’re essentially wrapping the entire curb in Kerdi. Plus you’ll want to use the pre-formed Kerdi corner pieces at the curb ends.
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Old 06-27-2018, 09:14 PM   #3
tilelayer
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What he said.

All and all the kerdi board is just acting as something to attach your kerdi membrane to that isn't wood, because wood and kerdi don't get along.
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Old 06-27-2018, 10:42 PM   #4
jadnashua
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If you have enough KerdiBoard left over from the rest of the shower, consider just bonding enough Kerdiboard together to make your curb and forget the 2x4's entirely. KerdiFix or thinset works fine bonding it together, then there's fewer screw holes to fix, too.
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Old 06-28-2018, 06:58 AM   #5
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Or forget the Kerdiboard all together and cover the wood curb with drywall or CBU. In any case you'll need to cover the whole thing, or nearly the whole thing, with Kerdi before you're finished.

And that way you won't hafta worry about putting dents in the Kerdiboard on top of the curb when you kneel on it to work on the floor. Which you will do.

My opinion; worth price charged.
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