Steel shop question

I went with this stuff called Double Bubble, basically two sheets of bubble wrap with a foil insulator, in my 30x40 metal building after losing a couple walls to a tornado in 2011. With an R-19 value at $160 per 6' x100' foot rolls, it adheres with F26 construction adhesive. I have a big thread on GarageJournal.com (same user name everywhere) with lots of pictures. Pay attention to the temp gun photos!! Those are actual before and after insulation as measured on the same west-facing wall -- and the difference was amazing.

It's worked soooo well that the two window mount a/c units we installed at the same time have only been turned on TWICE since it was installed ... and one of those times was just to test them.

I've been very happy with it and would recommend it again.