Minimum Roof Insulation R Value

Or component performance alternative of section c402 1 5 roof solar reflectance and thermal emittance fenestration in building envelope.

Minimum roof insulation r value.

Specific insulation requirements of section c402 2 thermal requirements of either. The document was updated in 2020 and is available on the carlisle syntec website. 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. The higher the r value the better the thermal performance of the insulation.

R value based method of section c402 1 3 u c and f factor based method of section c402 1 4. 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. Minimum insulation r value requirements by state. Recommended home insulation r values.

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. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities.