I'm considering options for insulating my 30' x 40' workshop, which is a steel building.
Spraying on 1" of closed cell foam would cost nearly $4K (doing it myself) and would give an R-value of about 7. Spraying foam does not look like it's an easy job in an established workshop with DC ducting and wiring.
I'm more interested in a double foil insulation with a 1/4" thick foam core. It comes in 4' by 175' rolls and has a stated R-value of 14. Information on this product can be found at www.insulation4less.com. The job should cost about $1K with this option.
Has anyone tried this or a similar product? Any thoughts on the advantages/disadvantages of the foil insulation approach would be much appreciated.