Minimum Roof Insulation R Value

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

Minimum roof insulation r value.

The terminology average r value for tapered systems is an outdated term and not recognized by the iecc. 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. R value based method of section c402 1 3 u c and f factor based method of section c402 1 4. Insulation level are specified by r value.

The document was updated in 2020 and is available on the carlisle syntec website. When determining how much insulation you need don t guesstimate calculate. The higher the r value the greater the insulation performance. Minimum insulation r value requirements non residential above roof deck is an extremely handy table for state and local jurisdictions in the united states.

Minimum insulation r value requirements non residential above roof deck. Or component performance alternative of section c402 1 5 roof solar reflectance and thermal emittance fenestration in building envelope. 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.

Know exactly how much you need with our project calculators. Specific insulation requirements of section c402 2 thermal requirements of either. Recommended home insulation r values. If you think you re among the 90 of us homes that are under insulated 1 performing a simple insulation inspection will help you determine your insulation needs.

Minimum insulation r value requirements by state. 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. 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. For over 50 years insulfoam has been enabling building professionals to construct high quality building insulation systems at a minimal cost.

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