Residential Roof R Value Requirements

The document was updated in 2020 and is available on the carlisle syntec website.

Residential roof r value requirements. 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 by state. 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. 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.

Know exactly how much you need with our project calculators. Minimum insulation r value requirements non residential above roof deck is an extremely handy table for state and local jurisdictions in the united states. R value is a measure of insulation s ability to resist heat traveling through it. 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.

The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. Always double check with your local authority to confirm which code is currently in effect. Insulation level are specified by r value. When determining how much insulation you need don t guesstimate calculate.

Minimum insulation r value requirements non residential above roof deck. Specific insulation requirements of section c402 2 thermal requirements of either. Recommended home insulation r values. Iecc 2015 requirements by climate zone 3.

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

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. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. R value measures how well certain building insulation materials can resist heat. What r value do i need.