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Old 03-09-2018, 02:41 PM   #1
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Join Date: Mar 2018
Location: Colorado Springs
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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, 07:13 PM   #2
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Location: NW Arkansas, Ozark Mountains
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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, 09:43 PM   #3
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Thanks, yea im not sure how i got to that train of thought. #delete thread

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, 09:46 PM   #4
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If you want to limit the height buildup, look at Schluter's Bekotec. It's slick.
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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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