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Unread 02-28-2007, 08:28 PM   #1
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Join Date: Sep 2005
Posts: 114
Building Code for Kerdi over Drywall

I am doing 3 condo rehabs where the bath is on an outside wall. The outside wall needs to be 2 hour rated(2 layers of 5/8" type x sheetrock).

i figured this would be a perfect place to get into kerdi as instaling cement baord over two layers of dywall isnt really a great solution.

my issues is i am sure the building inspector is going to wonder about the drywall. i did some research about kerdi and plumbing code and i found a writeup on the drain but nothing that says the membraine is approved for over drywall instead of concrete board or green board.

anyone know where i can find that code approval?
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Unread 02-28-2007, 10:03 PM   #2
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Location: LaConner, Washington
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Andy, here is the listing certificate for Kerdi with the UPC certification mark. http://www.johnbridge.com/images/mik...ust%202006.PDF

As you can see it does not specify specific materials like drywall, greenboard, or concrete board. What it does say is this:
To be installed in accordance with the manufacturers instruction and the latest Uniform Plumbing Code...
Best advice I can give is get this all hashed out with the Planning Department/Building Inspector ahead of time. Take a copy of that IAPMO listing certificate with you. That will help your case a lot.
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Unread 02-28-2007, 10:45 PM   #3
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My inspector had not run into Kerdi previously, but was mollified when presented with the certifications. I also gave him the website link and he took the time to watch the video installation. After that, I didn't have any problems. Basically, while code generally says you can't use drywall in a wet area, since the sheet membrane is waterproof when installed properly, the drywall technically and practically, isn't in a wet area. Good luck.
Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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