Roof Insulation R Value Requirements

Minimum insulation r value requirements non residential above roof deck.

Roof insulation r value requirements.

State only ma massachusetts 780 cmr chapter 13 5 r 30 state only mi michigan ashrae 90 1 2007 5 r 20 6 r 20 7 r 20 state only mn minnesota minnesota commercial state building code 6 r 30 7 r 35 please see disclaimer on back page. Or component performance alternative of section c402 1 5 roof solar reflectance and thermal emittance fenestration in building envelope. Minimum insulation r value requirements by state. R value is a measure of insulation s ability to resist heat traveling through it.

Where you live different climates require different insulation r values. The higher the r value the better the thermal performance of the insulation. Minimum insulation r value requirements non residential above roof deck. 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 value based method of section c402 1 3 u c and f factor based method of section c402 1 4. The document was updated in 2020 and is available on the carlisle syntec website. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. 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.

As well as determining specific r value requirements for different parts of a home they also contain requirements for ventilation and various other related issues. There are many ways to retrofit a home with fiberglass and. For the purpose of insulation regulations australia is divided into many different. Iecc 2015 requirements by climate zone 3.

The table below shows what levels of insulation are cost effective for different climates and. These r values are a sum meaning this should be the total r value once you add up the entire depth of 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. The regulations in the building code of australia bca that apply to home insulation are complicated.

Your home s age if your home is more than 10 year old you likely need more insulation. Browse product options or contact your local insulfoam rep to help you quickly pick the best products to simplify your building envelope needs and fit your project budget all with one supplier. How much insulation does my home need. Specific insulation requirements of section c402 2 thermal requirements of either.

Insulation level are specified by r value.