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Old 11-20-2017, 02:52 PM   #1
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Kerdi Membrane over Plywood or CMU Bench?


Hi,

I built my shower bench for my massive shower yesterday.

My question now is, do I use plywood then put the kerdi membrane over that? Or do I do Hardibacker/Durorock and then put the kerdi membrane over that instead? Or do I do plywood then Hardibacker then kerdi membrane?

I have the membrane just for this and the skylight in the shower. I have the Kerdi panels for the walls.

Please let me know which is the correct way to do this as I can't find the answer on the schulter site or elsewhere online.

Thank you!
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Old 11-20-2017, 03:46 PM   #2
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Re: Kerdi Membrane over Plywood or CMU Bench?


Did you run the waterproofing under that structure and did you put fasteners through that bottom plate, through the waterproofing?
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Old 11-20-2017, 04:59 PM   #3
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Re: Kerdi Membrane over Plywood or CMU Bench?


The pan liner was already run and I build the bench on top of it. The Kerdi will waterproof the bench anyway, including the sill plate so it doesn't even need to have the liner under it anyway. So even if there are holes in the liner there, they are in the liner where the sill plate will be protected and water tight from the kerdi and the kerdi band and the rest. I considered that when I was doing it.

But that's not my question, I need to know whether to use plywood or hardibacker on the bench. Either way it will be waterproofed by the kerdi.

Thanks
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Old 11-20-2017, 05:30 PM   #4
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Re: Kerdi Membrane over Plywood or CMU Bench?


CMU is concrete block. I only see wood framing. Edit: Use plywood for structural integrity. CBU is not structural. Then add your Kerdi.
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Old 11-20-2017, 06:13 PM   #5
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Re: Kerdi Membrane over Plywood or CMU Bench?


That was exactly my question. So I'll do the plywood then the kerdi on top - which mean I won't need the concrete board/hardibacker at all.

Thanks!
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