Above floor sandwich construction details
Last Post 29 Dec 2014 08:01 PM by sailawayrb. 5 Replies.
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cnygeoUser is Offline
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29 Dec 2014 12:21 AM
I'm embarking on my first "sandwich" install, using OSB rips as sleepers with thin plates over a plywood subfloor. I'm curious if people generally glue the sleepers to the subfloor as well as screw them. I'm going to use constant circulation with reset, so I'm not too worried about expansion noise. I'm more concerned with floor squeaks. If the glue is overkill I'd rather skip it. Also, what are everyone's thoughts on stapling the plates down? It seems to me that the less constrained the plate is the better, so I was planning on one or two staples on one side of the plate only.
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29 Dec 2014 09:07 AM
We don’t get involved with low efficiency HR emitters or remodels, only concrete slab HR emitters and new construction. Why not use Warmboard or some other similar product in lieu of plates and high-labor sandwich approach?
Borst Engineering & Construction LLC - Competence, Integrity and Professionalism are integral to all that we do!
cnygeoUser is Offline
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29 Dec 2014 03:27 PM
Not really relevant at this point since the ship has sailed and I have my materials, but sandwich offers the best trade off between cost, labor, and water temps in my case. I could save a few degrees of water temp with warmboard or heavy plates, but the payback isn't there.
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29 Dec 2014 04:48 PM
Yes, I get it... Keeping in mind that we have zero experience with this plate/sandwich method, I would speculate that not overly constraining the plates might be better for reducing the temp change buckling noises that some folks complain about. Dan from BlueRidge hangs out here, he has considerable experience with this plate/sandwich method, and he should have good guidance for you.
Borst Engineering & Construction LLC - Competence, Integrity and Professionalism are integral to all that we do!
BadgerBoilerMNUser is Offline
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29 Dec 2014 07:14 PM
Glue them carefully for the reason you suggest. I hate a squeaky floor and the more moving parts...

The reason most older floors squeak is boards pulling nails up and down as you walk, screwed and glued is as good as it gets.

All plate should be nailed or stapled regularly since plate-to-wood contact is what sandwich radiant systems are all about.

We use heavy plates here in Minneapolis but your point on ROI is well taken.

Dan is the Man on light plate radiant sandwich systems.
MA<br>www.badgerboilerservice.com
sailawayrbUser is Offline
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29 Dec 2014 08:01 PM
"All plate should be nailed or stapled regularly since plate-to-wood contact is what sandwich radiant systems are all about."

That makes good sense. If you will be constantly circulating to mitigate expansion buckling noise, it seems like this should work fine. Likely the only thing better would be the thicker plates as they would be less prone to buckle.
Borst Engineering & Construction LLC - Competence, Integrity and Professionalism are integral to all that we do!
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