Update by user Apr 13, 2018 http://www.greenbuildingadvisor.com/blogs/dept/musings/stay-away-foil-faced-bubble-wrap Original review posted by user Apr 12, 2018 I emailed for R Value data in northern cold climates. Asked for testing data on heat loss UP through roofs and Out through walls. Everything that is not on their website. First email referred me back to pages with out this info. Then he got abusive. i pointed out he was blowing a 45k sq ft sale of his most expensive product. He just got more rude. And never provide the tech data. Also, samples sent to me started faking off mylar within 3 weeks. Bottom line, salesman's a flake, product flakes off, they don't care about a potential large sale. There are other companies making this type of product. Do yourself a favor, track them down and don't do biz with Insulationfornosatisfaction