Quote:
Originally Posted by skyking
...and still protect whatever tubing used from being abraded. The metal roof expands and contracts every day, and moves slightly. I can hear our other roofs move from time to time.
One method had the tubing in a metal hat channel that the roofing sat on, so the roofing was not touching the tube directly.
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PEX expands much much, more than metal... about 1"/100'/10 degrees F. But as long as the pipe doesn't run over a metal edge, it shouldn't be a problem.
If you are really worried about abrasion, go and haunt some radiant floor heating blogs to see how they handle the problem, and much more likely,
is there an abrasion issue at all?
I think that a more suitable problem to resolve is how are you going to accomplish the 180 degree U-turns at the top & bottom, and not expose your PEX to sun light?
-AC