Minimum Roof Insulation R Value

When determining how much insulation you need don t guesstimate calculate.

Minimum roof insulation r value.

Know exactly how much you need with our project calculators. 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. 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. Minimum insulation r value requirements non residential above roof deck.

Minimum insulation r value requirements by state. Specific insulation requirements of section c402 2 thermal requirements of either. Insulation level are specified by r value. R value measures how well certain building insulation materials can resist heat.

For over 50 years insulfoam has been enabling building professionals to construct high quality building insulation systems at a minimal cost. The higher the r value the greater the insulation performance. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. There is an exception provided that allows the minimum thickness to be up to 1 less than the prescriptive r value at per foot slope as long as the system r value meets or exceeds that prescriptive 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. 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. The higher the r value the better the thermal performance of the insulation. The document was updated in 2020 and is available on the carlisle syntec website.

R value is a measure of insulation s ability to resist heat traveling through it. The terminology average r value for tapered systems is an outdated term and not recognized by the iecc. Minimum insulation r value requirements non residential above roof deck is an extremely handy table for state and local jurisdictions in the united states. Recommended home insulation r values.

R value based method of section c402 1 3 u c and f factor based method of section c402 1 4.