Minimum Roof Insulation R Value

The higher the r value the better the thermal performance of the insulation.

Minimum roof insulation r value.

Or component performance alternative of section c402 1 5 roof solar reflectance and thermal emittance fenestration in building envelope. Recommended home insulation r values. Minimum insulation r value requirements non residential above roof deck is an extremely handy table for state and local jurisdictions in the united states. The document was updated in 2020 and is available on the carlisle syntec website.

Minimum insulation r value requirements non residential above roof deck. Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. Specific insulation requirements of section c402 2 thermal requirements of either. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces.

R value is a measure of insulation s ability to resist heat traveling through it. R value based method of section c402 1 3 u c and f factor based method of section c402 1 4. Insulation level are specified by r value.