Minimum Roof Insulation R Value

Recommended home insulation r values.

Minimum roof insulation r value.

Specific insulation requirements of section c402 2 thermal requirements of either. With the widest range of faced laminated and standard high performance eps insulation products insulfoam has the right products for your needs while still providing the highest r value per dollar over. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. For over 50 years insulfoam has been enabling building professionals to construct high quality building insulation systems at a minimal cost.

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. The terminology average r value for tapered systems is an outdated term and not recognized by the iecc. 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. Know exactly how much you need with our project calculators. 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. Having the correct amount of attic insulation can help you maintain a comfortable temperature throughout your home and help save money on your energy bills plus prevent major issues like ice dams in the winter.

The higher the r value the greater the insulation performance. Minimum insulation r value requirements by state. Minimum insulation r value requirements non residential above roof deck. When determining how much insulation you need don t guesstimate calculate.

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

R value measures how well certain building insulation materials can resist heat.