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Old 09-15-2018, 03:52 PM   #1
mis_desk
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Another CBU Wicking Question

Hello Everyone,

This is my first time asking for some advice after lurking in the shadows for a bit.

After researching the topic wicking with the CBU inside the mud bed, I still don't see a concise answer. Some answers say to embed it and others say to keep it slightly above the mud.

I was thinking of another option:

Has anyone tried RedGarding the bottom 8 inches or so of the CBU on all sides and once dried, THEN install it in the mud as recommended?

I don't see any negatives with pre-RedGarding and that might mitigate any wicking concerns.

Does anyone have any opinions on this?

Thanks for any input!

MD
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Old 09-15-2018, 05:27 PM   #2
cx
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Welcome, MD.

From our Parent Site.

I would not recommend that. Fine to use your direct bonded waterproofing membrane on the face of your wallboard before you place your final mud bed, but don't put the membrane on the bottom edge of the board. Water will find its way into the CBU over time and it needs a way to exit at the bottom into the mud and finally to the drain.

My opinion; worth price charged.
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Old 09-15-2018, 05:50 PM   #3
jadnashua
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There are two different classes of cbu:
- fiber cement boards (such as HardieBacker)
- 'real' cement boards (most of the others, but not all)

The TCNA guidelines list two methods, one for each of the two classes of cbu. A fiber-cement board should NOT be embedded.
A 'real' cement board CAN be embedded.

Read and follow the instructions for the brand you choose to install.
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Old 09-15-2018, 08:23 PM   #4
Davy
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Yep, what the others said. If you cover the bottom 8 inches then moisture will soak in above the Redgard, gravity will pull it down and it'll be trapped. If you're going to cover the CBU, cover the whole wall on the tile side only.
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Old 09-16-2018, 06:55 AM   #5
mis_desk
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Thanks for all the input, it's much appreciated.
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