Minimum R Value For Roof Insulation

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

Minimum r value for roof insulation.

Minimum insulation r value requirements by state. Recommended insulation levels for retrofitting existing wood framed buildings. 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.

The higher the r value the greater the insulation performance. R 20ci r 25ci r 25ci r 30ci r 30ci r 30ci r 35ci r 35ci question. 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. Minimum insulation r value requirements non residential above roof deck.

Add insulation to attic. R value measures how well certain building insulation materials can resist heat. 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 r values shown above are the minimum r values required to meet code requirements.

Existing 3 4 inches of insulation. How does this affect r values on a tapered insulation system. Since a tapered insulation system will increase thickness away from the low points the overall system r value will. When determining how much insulation you need don t guesstimate calculate.

Know exactly how much you need with our project calculators. If structural sheathing covers 40 or less of the exterior continuous insulation r value shall be permitted to be reduced by no more than r 3 in the locations where structural sheathing is used to maintain a consistent total sheathing thickness.