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Unread 06-30-2020, 08:10 AM   #1
Merse
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Edgeguard Embedded in Mud Bed?

Apologies if this has been answered before, but I tried searching to no avail.

I'm just curious if edgeguard is allowed to be embedded within a mud bed or should I use a different cement board for the lower portion of a shower? I also couldn't find any information from the product sheet regarding this.

Thank you in advance, this forum has been great for information and resources.
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Unread 06-30-2020, 08:55 AM   #2
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I'd never heard of the product, so I took a stroll with Google which brought all kinds of interesting but seemingly unrelated-to-tile things.

If you're talking about Durock with EdgeGuard, it looks to be a marketing buzzword and some print on the edge of their tile backer. I can't see any reason to be concerned about burying in mud unless covering the printing bothers you
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Unread 06-30-2020, 10:10 AM   #3
cx
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Welcome, Merse.

What Peter said.

In general, any of the CBUs that meet ASTM C1325 can safely be bedded into the mortar bed in a traditional shower receptor construction. That's as opposed to the Fiber/Cement boards (C1288) and all the gypsum-based tile baker boards, which cannot be bedded in the mortar beds.

If you're dealing with USG's Durock, you'll find the manufacturer has been a bit inconsistent in his recommendations over the years on that subject, but in general the above applies. And there's no USG any more, so they can't well dispute that, eh?

My opinion; worth price charged.
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Unread 06-30-2020, 02:07 PM   #4
Merse
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Thank you both, yes edgeguard is ASTMC1325, which makes sense that it should be ok embedded in mud. I just wanted to be sure it wouldn't wick any water. Thanks again!
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Unread 06-30-2020, 02:08 PM   #5
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The Durock will wick water. That won't damage the CBU.

My opinion; worth price charged.
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Unread 06-30-2020, 03:51 PM   #6
jadnashua
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A big misconception with people is that a cement board is waterproof...that is NOT true. Cement is not damaged by being wet (well, depends on what chemicals might be IN the water), but is not waterproof.

There are ways to make a shower literally waterproof on all surfaces. Some find that benefit worth the extra costs.
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