Minimum Roof Insulation R Value

This exception will allow the minimum thickness to be 4 2 at the low point or 5 2 4 away from the drain on a per foot tapered system.

Minimum roof insulation r value. Recommended insulation levels for retrofitting existing wood framed buildings. 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. The higher the r value the greater the insulation performance. Add insulation to attic.

There are many ways to retrofit a home with fiberglass and mineral wool insulation. Existing 3 4 inches of insulation. Your home s age if your home is more than 10 year old you likely need more insulation. 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.

R value measures how well certain building insulation materials can resist heat. Zone 6 requires an r 30 minimum which is 5 2 thick. Basement walls require a minimum of either r 10 continuous or r 13 batted insulation. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

Minimum insulation r value requirements non residential above roof deck is an extremely handy table for state and local jurisdictions in the united states. Total minimum ratings to provide 1 75 btu or 0 50 watts per ft2 of conditioned floor area or provide 3 of energy used for mechanical and swh equipment and lighting dedicated outdoor air system per c406 6 or be equipped with an independent ventilation system designed to provide 100 outdoor air to each occupied space. Minimum insulation r value requirements non residential above roof deck. When determining how much insulation you need don t guesstimate calculate.

Minimum insulation r value requirements by state. 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. Hunter panels roofing tech topic r105.

Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities.