Minimum Roof Insulation R Value

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

Minimum roof insulation r value.

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. Minimum insulation r value requirements non residential above roof deck is an extremely handy table for state and local jurisdictions in the united states. Insulation level are specified by r value.

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. Or component performance alternative of section c402 1 5 roof solar reflectance and thermal emittance fenestration in building envelope. R value based method of section c402 1 3 u c and f factor based method of section c402 1 4. R value is a measure of insulation s ability to resist heat traveling through it.

The document was updated in 2020 and is available on the carlisle syntec website. Recommended home insulation r values. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities.