Minimum Roof Insulation R Value

The higher the r value the better the thermal performance of the insulation.

Minimum roof insulation r value.

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

Your home s age if your home is more than 10 year old you likely need more insulation. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. 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. 2015 code requires walls to be insulated with a minimum of r 20 or r 13 5 13 5 means r 13 cavity insulation plus r 5 insulated sheathing.

Minimum insulation r value requirements non residential above roof deck. Hunter panels roofing tech topic r105. There are many ways to retrofit a home with fiberglass and mineral wool insulation. 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. 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. Insulation level are specified by r value. R value measures how well certain building insulation materials can resist heat.

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. Zone 6 requires an r 30 minimum which is 5 2 thick. The higher the r value the greater the insulation performance. Know exactly how much you need with our project calculators.

R value is a measure of insulation s ability to resist heat traveling through it. Recommended home insulation r values.