Residential Roof Insulation R Value

Minimum insulation r value requirements by state.

Residential roof insulation r value.

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. The table below shows what levels of insulation are cost effective for different climates and. Thermafiber residential mineral wool insulation commercial grade at home thermafiber residential mineral wool blankets are ideal for insulating walls floor ceilings and attic spaces in homes.

Your home s age if your home is more than 10 year old you likely need more insulation. 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. Where you live different climates require different insulation r values. R panel is manufactured with a closed cell polyisocyanurate foam core bonded to fiberglass reinforced facers and designed for use over metal nailable and non nailable roof decks with a variety of membrane systems.

Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. The document was updated in 2020 and is available on the carlisle syntec website. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. R value is a measure of insulation s ability to resist heat traveling through it.

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. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. R value measures how well certain building insulation materials can resist heat. When determining how much insulation you need don t guesstimate calculate.

Recommended home insulation r values. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. 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. Minimum insulation r value requirements non residential above roof deck is an extremely handy table for state and local jurisdictions in the united states.

There are many ways to retrofit a home with fiberglass and. These products provide a high r value inch excellent sound attenuation characteristics and outstanding fire performance. Know exactly how much you need with our project calculators.