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Old 03-09-2018, 03:41 PM   #1
Jon80911
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Pex above subfloor

This is a DIY bathroom remodel in my home. I am running half inch pex over my subfloor in deck mud. The approved installation method, as i understand it, is as follows:
subfloor (reinforced at joists)
15lb felt
expanded metal lath stapled to subfloor
pex anchored with click in clips
5:1 sand/portland deckmud installed flush to the top of pex
15lb felt
__________________here's my question________________

the method calls for another 1.25" of reinforced deck mud
can i replace that with 1/2" durock instead of the additonal deck mud?

The floorspace of the bathroom is 5' X 8' and and a 3' X 2' area is covered by the vanity.

The tile is atlas global 24X24 porcelain.

I suspect the durock is NOT an acceptable substitution. I am assuming that the durock will have deflection directly over the pex lines making it unsuitable for tile. Or possibly the thermal expansion of the pex line will eventually cause deflection directly above them.
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Old 03-09-2018, 08:13 PM   #2
Kman
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Welcome to the forum, Jon.

I definitely wouldn't use cement board for that application. You'd be nailing or screwing into deck mud, or worse, your pex lines.
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Old 03-09-2018, 10:43 PM   #3
Jon80911
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Thanks, yea im not sure how i got to that train of thought. #delete thread

Nonetheless
Big project underway, so the thread will live. How embarrassing.

Many questions to come in the near future. Back to the mudbox for more learn'ns.
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Old 03-09-2018, 10:46 PM   #4
jadnashua
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If you want to limit the height buildup, look at Schluter's Bekotec. It's slick.
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Old 04-25-2018, 04:29 AM   #5
Jon80911
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This bathroom is nearing completion. I embedded the pex in deckmud and covered it with more mud. Bout 700 additional pounds worth. Very satisfied with that part 'cept my screed board got conjiggered in the middle of everything so I ended up pouring an overlay with Slc at maybe 3/8" at its thickest. Great results.
The tile layout is unique, I guess. Used kerapoxy grout high and low. Here's what it looks like currently.
I regret not moving the hvac to under the vanity.
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Last edited by Jon80911; 04-25-2018 at 09:13 AM.
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Old 04-25-2018, 07:34 AM   #6
JerseyDIYguy
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Interesting approach to the corners above the tub. How did you fill in behind the tiles set on the 45 degree?
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Old 04-25-2018, 09:05 AM   #7
Jon80911
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Warren I ripped 45s on 1x6 cement board I had surplus from trimming the houses exterior. Fiddled with em enough to get a snug fit then screwed into studmeat on the front and back walls and caulked where they intersect the side wall. Redgard was applied to the face.
So far so good, but I doubt it's proper.
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Old 04-25-2018, 09:15 AM   #8
smifwal
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. I looked at this earlier on my phone and don't take notice of the corners till Jersey mentioned it that is pretty cool.
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