Residential Roof R Value Requirements

R value state local al alabama 2015 alabama commercial energy code 2 r 25 3 r 25 state local ak alaska 2012 alaska building energy efficiency standard.

Residential roof r value requirements.

Minimum insulation r value requirements non residential above roof deck is an extremely handy table for state and local jurisdictions in the united states. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. Where section 1102 1 2 requires insulation r values greater than r 30 in the ceiling and the design of the roof ceiling assembly does not allow sufficient space for the required insulation the minimum required insulation r value for such roof ceiling assemblies shall be r 30. R value is a measure of insulation s ability to resist heat traveling through it.

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. The document was updated in 2020 and is available on the carlisle syntec website. Insulation level are specified by r value. What r value do i need.

R value measures how well certain building insulation materials can resist heat. Iecc 2015 requirements by climate zone 3. Know exactly how much you need with our project calculators. Always double check with your local authority to confirm which code is currently in effect.

R value based method of section c402 1 3 u c and f factor based method of section c402 1 4. Specific insulation requirements of section c402 2 thermal requirements of either. The higher the r value the better the thermal performance of the insulation. The higher the r value the greater the insulation performance.

State applicable energy ashrae zone minimum r value state local ms mississippi ashrae 90 1 2010 2 r 20 3 r 20. Minimum insulation r value requirements non residential above roof deck. Recommended home insulation r values. Or component performance alternative of section c402 1 5 roof solar reflectance and thermal emittance fenestration in building envelope.

The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. Minimum insulation r value requirements by state. Browse product options or contact your local insulfoam rep to help you quickly pick the best products to simplify your building envelope needs and fit your project budget all with one supplier. When determining how much insulation you need don t guesstimate calculate.