Minimum Roof Insulation R Value

You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

Minimum roof insulation r value.

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. When determining how much insulation you need don t guesstimate calculate. Minimum insulation r value requirements non residential above roof deck is an extremely handy table for state and local jurisdictions in the united states. Add insulation to attic.

Minimum insulation r value requirements by state. There are many ways to retrofit a home with fiberglass and mineral wool 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 state local mo missouri 2012 iecc 4 r 25 5 r 25 state only mt montana 2012 iecc 6 r 30.

The document was updated in 2020 and is available on the carlisle syntec website. Existing 3 4 inches of insulation. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. Minimum insulation r value requirements non residential above roof deck.

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. Know exactly how much you need with our project calculators. 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. Hunter panels roofing tech topic r105.

R value measures how well certain building insulation materials can resist heat. Zone 6 requires an r 30 minimum which is 5 2 thick. Recommended levels of insulation. Your home s age if your home is more than 10 year old you likely need more insulation.

Recommended insulation levels for retrofitting existing wood framed buildings.