Minimum Roof Insulation R Value
Minimum insulation r value requirements by state.
Minimum roof insulation r value. Or component performance alternative of section c402 1 5 roof solar reflectance and thermal emittance fenestration in building envelope. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. 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. State applicable energy ashrae zone minimum r value state local ms mississippi ashrae 90 1 2010 2 r 20 3 r 20 state local mo missouri 2012 iecc 4 r 25 5 r 25 state only mt montana 2012 iecc 6 r 30.
Minimum insulation r value requirements non residential above roof deck. Recommended home insulation r values. Insulation level are specified by r value. R value based method of section c402 1 3 u c and f factor based method of section c402 1 4.
The document was updated in 2020 and is available on the carlisle syntec website. 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. Minimum insulation r value requirements non residential above roof deck is an extremely handy table for state and local jurisdictions in the united states.