The R-value of insulation is a measurement of how much ... Chris Stevenson, Roofer and Sales Manager at 730 South Exteriors & Roofing, a Denver roofing company, notes that “In colder climates ...

Here’s how it works on a roof, and it’s especially ... The other issue is insulation levels. Two inches of rigid foam has an R value of only about 10, which is not enough to code for new ...