Back in September many of you provided excellent info regarding my attempts to do a radiant ceiling heating/cooling system in a remodel. As of now we have abandoned this idea completely. The plan is to do radiant floor heat and possibly add a small separate cooling system to handle the master suite.
The house is now down to the studs and my contractor has talked to several HVAC subs, each of whom is recommending a different way of installing the system. I have been away and not able to meet with the subs as of now. The house is 60 years old with either full height basement or crawl space under all flooring. The basement joists are 12" and the crawl space joists are 8". Before removing the existing hardwood floors, the living room/dining room and kitchen had 9'4" ceilings and the bedroom wing had 8'1" ceilings.
We do not want to lose more than 1" of bedroom wing height and want an engineered hardwood floor except for kitchen and baths, so doing a gypcrete floor is out. The two solutions that have been proposed are using an Uponor type floor with precut channels for PEX and an aluminum radiator sheet under it that will sit on top of the subfloor (an addition of about 5/8" to the total floor) or an Ultra-fin installation below the subfloor that is then insulated from below. Apparently, there is only one mfg. for the Ultra Fin because of patents. We would also insulate the the Uponor style from below. I didn't look at Warmboard yet.
I would appreciate any suggestions regarding these two choices or some other choice not mentioned. I did look at a different forum that had comments from 2004 regarding the Ultra Fin system not performing well if the area beneath it was cold. I'm also not crazy about the 180 degree temp I think the water needs to be.
Separately, I want to thank Skippedover for some recent general advice regarding choice of subs to use.