I ran a search for duct work for my roof top heat pumps, and came up with a company called Innovative Energy from Ind! Wow! this stuff is perfect its 3/16ths styrofoam foil sided both sides! They have a great product and the price was hard to beat, I thought I would have two weeks in building this system...........it took two days and its so simple, I'll try to take some pictures tomorrow! This stuff is made just for RV systems! Here is their site: http://www.insul.net/thankyou.html
Hi Pat,
Ultra Duct is very easy to work with. We use it for some return air plenums.
I hope the suplier instructed you about the "Air Barrier". To obtain the mfg's R-value, the duct has to be wrapped [with another layer] leaving an air space
between the inner and outer layers. Without the air barrier the R value drops dramaticly.
Anyway, I would love to see pics when you done!
Good Luck
Nick-