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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. Use the JM insulation calculator to determine the recommended R-value for your project, as well as how much insulation you’ll need.
R-Value is a measure of insulation’s ability to resist heat traveling through it. The higher the R-Value the better the thermal performance of the insulation. The table below shows what levels of insulation are cost-effective for different climates and locations in the home.
Residential insulation codes and standards are presented by NAIMA in a number of literature pieces. The content includes design guides and FAQs. The International Code Council develops model residential energy codes every three years, referred to as the International Energy Conservation Code (IECC).
The choice of exterior insulation is determined by the thickness required to meet specific R-value targets. Generally, colder climates require higher R-values. The IRC map provides a prescriptive guide to proper thickness and ratios of interior and exterior insulation.
Attics, walls, and floors each have unique R-value needs: Attics: As much as 30% of a home’s heat loss happens through the roof, so attics need the highest R-value insulation, ranging from R-30 to R-60 depending on the climate zone. Walls: Wall insulation needs are more moderate, with recommended values between R-13 and R-21.
To properly insulate a new home, you’ll need to know where to insulate and the recommended R-values for each of those areas. Use the Home Energy Saver tool to determine where you need to insulate and the recommended R-values based on your climate, type of heating and cooling system, etc.
*CI stands for "continuous insulation" that is applied to the exterior of the wall assembly just inside the cladding. Example: “R5 CI or R13” defines two different choices: R-5 continuous insulation (CI on the interior or exterior surface of the wall or R-13 cavity insulation on the interiors side of the wall. Where a combination of CI and ...