Minimum Roof Insulation R Value

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.

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. Minimum insulation r value requirements non residential above roof deck is an extremely handy table for state and local jurisdictions in the united states. Minimum insulation r value requirements non residential above roof deck. Minimum insulation r value requirements by state.

Add insulation to attic. When determining how much insulation you need don t guesstimate calculate. Your home s age if your home is more than 10 year old you likely need more insulation. The document was updated in 2020 and is available on the carlisle syntec website.

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

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. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. There are many ways to retrofit a home with fiberglass and mineral wool insulation. 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.

Existing 3 4 inches of insulation. Recommended levels of insulation. R value measures how well certain building insulation materials can resist heat. Recommended insulation levels for retrofitting existing wood framed buildings.

Hunter panels roofing tech topic r105.