Residential 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.

Residential roof insulation r value.

The higher the r value the better the thermal performance of the insulation. Where you live different climates require different insulation r values. 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. The table below shows what levels of insulation are cost effective for different climates and.

Minimum insulation r value requirements non residential above roof deck is an extremely handy table for state and local jurisdictions in the united states. 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. 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. 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. The document was updated in 2020 and is available on the carlisle syntec website. 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. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency.

You will need a higher r value of insulation if you live in the northeast than if you live in southern california. Your home s age if your home is more than 10 year old you likely need more insulation. R value measures how well certain building insulation materials can resist heat. Know exactly how much you need with our project calculators.

Insulation level are specified by r value. R value is a measure of insulation s ability to resist heat traveling through it. There are many ways to retrofit a home with fiberglass and. Minimum insulation r value requirements by state.

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. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. These products provide a high r value inch excellent sound attenuation characteristics and outstanding fire performance.