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Rooster007
wide plank floors

I am in the process of building a log home with radiant (in the floor joists) through the house. My wife likes the rustic look of wide plank pine floors and although cheaper and quicker to install than narrow plank hard wood I am concerned with how the wide planks of soft wood would react to the heat (buckling ect). The floor itself will be sitting on 1/2" ply sub-floor which will be sitting on 3/4" ADVANDECs deck which is guarranteed water proof. The 1/2" PEXa will be suspended by clips/traks under everying 8" on center between the joists.

Should I be concerned with cupping/warping or is the fact that the PEXa is under everything and not in the floor enough to negate my worries.

Re: wide plank floors

I hope you get an answer on this, as I just recently had a friend as me a similar thing, and I don't know either.

I have worked with radiant heat under concrete floors and tile floors, but not wood.

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JLMCDANIEL
Re: wide plank floors

Cupping is caused by one side being exposed to moisture that the other side isn't. If you have a good moisture bearer, heat alone will not cause cupping.
Jack

sabo4545
Re: wide plank floors

Radiant heat floors should not get much above 85 degrees so heat should not be an issue with your floors. Of course no matter what the wide pine is going to move quite a bit with the changes in the seasons. I did use an engineered floor in my house when I put in radiant and that has worked out very well. A flooring dealer in your area could probably give you advice on what has worked well over radiant. Hope this helps you out.

Mike

Blue RidgeParkway
Re: wide plank floors
Rooster007 wrote:

I am in the process of building a log home with radiant (in the floor joists) through the house. My wife likes the rustic look of wide plank pine floors and although cheaper and quicker to install than narrow plank hard wood I am concerned with how the wide planks of soft wood would react to the heat (buckling ect). The floor itself will be sitting on 1/2" ply sub-floor which will be sitting on 3/4" ADVANDECs deck which is guarranteed water proof. The 1/2" PEXa will be suspended by clips/traks under everying 8" on center between the joists.

Should I be concerned with cupping/warping or is the fact that the PEXa is under everything and not in the floor enough to negate my worries.

Frankly I'm confused by subfloor layering. If anything the advantech would go on the joists first then ply for better holding power for the hardwood fasteners but why the three-layers and then under the floor hydronic?

Second, this is the first I've heard that Advantech was guaranteed waterPROOF, Unless they've come out with a new product, I don't think so. Supposedly more water resistant not to swell from direct water like regular particle board or OSB but really why are you using this? it has more resins and wax to offgas/discolor, make odors especially with under the floor between the joists hydronic especially if your building from scratch, why do this? With wider plank flooring I wouldn't trust OSB or advantech to hold fasteners, strips yes but planks, no, I don't care what they say in their tests I wouldn't trust it to hold bite especially with under the floor radiant heat.

Whats with the waterproof concerns anyway with hydronic heat and wood floors overtop if you're doing UNDER THE FLOOR heating?

heck I'd go with in-floor heating combination structural sub floor panel like Warmboard and have a more efficient and responsive radiant floor and stronger subfloor and save the extra step/layers and the 1/4"; OR just go with thicker plywood subfloor with under the floor radiant and skip the extra layer advantech all together - and use the money saved for better reflective foiled board insulation underneath and to buy the tarps needed to protect the subfloor from rain/snow water during construction, since you'd still need those for advantech anyway.

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