Example Values
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- Note that these examples use the non-SI definition and/or given for a 1 inch (25.4 mm) thick sample.
Vacuum insulated panels have the highest R-value (approximately R–45 per inch in American customary units); aerogel has the next highest R-value (about R–10-30 per inch), followed by isocyanurate and phenolic foam insulations with, R–8.3 and R–7 per inch, respectively. They are followed closely by polyurethane and polystyrene insulation at roughly R–6 and R–5 per inch. Loose cellulose, fiberglass (both blown and in batts), and rock wool (both blown and in batts) all possess an R-value of roughly R–-2.5 to R–-4 per inch. Straw bales perform at about R–1.5. However, typical straw bale houses have very thick walls and thus are well insulated. Snow is roughly R–1. Brick has a very bad insulative ability at a mere R–0.2, however it does have a good Thermal mass.
Read more about this topic: R-value (insulation)
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