Geo NR Gee
The staple up from beneth the floor dosen't work. I had tried that in a bedroom over a heated garage with sprayed insulation between and the room was cold. Even with the tubes 8" apart and hot water (160 deg F) running 24/7 "no heat". Best having the tubes running on top of the 3/4 ply in the warm board or quik trak with a ceramic tile over that. If your good with a router I can see why you can't make your own with 1/2 ply and aluminum sheet stock. The warm tile in the morning when you feet touch it is almost therapeutic.
Randen
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