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Unread 04-28-2007, 11:04 PM   #1
trihai
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A shower curb with cement board and Kerdi

Hi,
If I use Kerdi membrane, can I use 1/2" cement board to build a curb? The cement board will be installed on top of the wood and Kerdi membrane on top of the cement board.

I really don't understand why people have to have a mortar curb built when they use Kerdi membrane over it? Could someone please explain?

Thank you.

Trihai
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Unread 04-29-2007, 06:56 AM   #2
muskymike
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Hi Trihia, I think you are thinking of a shower with a pan liner that has a mortar curb. If you are using Kerdi you don't need it because the curb can be wrapped with drywall or cbu and covered with Kerdi.
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Unread 04-29-2007, 08:06 AM   #3
John Bridge
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Hi Trihai,

What Mike said.
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Unread 04-29-2007, 09:09 PM   #4
trihai
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Hi,
Thanks for your replies. However, I have seen many photos in which people use Kerdi with a mud curbs. Is that a habit or just because a mud curb is stronger?

One question: can I use Kerdi over the wood, no CBU?

Thank you.
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Unread 04-30-2007, 01:41 PM   #5
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Don't put the Kerdi directly to the wood on the curb. Yes you can wrap with CBU and make sure that you also put a little bit of slant inward on your curb. I like to lay in a thin piece of metal trim used to transition carpet to vinyl. It puts just a little lift on the outside edge and water will run into the pan.
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