Minimum Roof Insulation R Value

Recommended home insulation r values.

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. Minimum insulation r value requirements by state. Insulation level are specified by r value. Or component performance alternative of section c402 1 5 roof solar reflectance and thermal emittance fenestration in building envelope.

Specific insulation requirements of section c402 2 thermal requirements of either. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. R value based method of section c402 1 3 u c and f factor based method of section c402 1 4. Minimum insulation r value requirements non residential above roof deck is an extremely handy table for state and local jurisdictions in the united states.

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 is a measure of insulation s ability to resist heat traveling through it.