R-5 insulation rating 235688-R-5 insulation rating
Rigid foam board Rigid foam insulation comes in various materials, including polystyrene (R38 to R50), polyurethane (R55 to R65) and polyisocyanurate (R56 to R80) Unfinished foundation and basement walls are typical applications for these boards, which only require two to three inches to achieve the recommended R11 for basementAs a benchmark, one inch of solid wood has an Rvalue of 1 In comparison, an inch of blown fiberglass insulation has an Rvalue of 31 34 and an inch of blown cellulose in an attic has an Rvalue of 32 37 Along with knowing the Rvalue of a particular insulation, it is also important to calculate the Rvalue of a total systemThe same insulation will hold more heat the thicker it is installed Eight inches of poor quality insulation may have a higher and better RValue than one inch of topquality insulation So, you need to know an insulation product's thickness as well as its RValue in order to compare it to another product Loft Insulation An Introduction Thegreenage...