using suntuf as the only roofing on a large shop?

[AC_Hacker]

Originally Posted by skyking

So, you are thinking insulating board or something similar over the roof sheeting?
Like this?
3/4" Foil Faced Insulation Panel at Menards
That does pose a fastener question regarding the metal roof. I'd have to get a long enough fastener to reach through to the OSB to tie the metal down well.

Yeah, I was thinking of something like that... not any kind of super-insulation strategy (unless you want to be a certified insulation hero) but enough to allow the heat to build up for the water or water/glycol fluid.

The fastener issue is not a big deal, metal roofs go on over much thicker insulation than you are considering, all the time.

But where on the metal roofing will your fasteners go? Will that intrude onto your PEX channel?

-AC