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. Learn how to take action today and Rule Your Attic! with ENERGY STAR.

We'll help you determine your climate zone and corresponding insulation requirements based on your building envelope area and application.

Our R value guide to rigid insulation includes the DOE's recommended insulation by zone chart, R value calculator and base building material R values chart.

Use the following map to determine your climate zone and then the following tables to estimate the required R-values. See the 2021 International Energy Conservation Code for more information on climate zones.

Insulation materials and rated by their R-value or R, or by their U-value or U. A higher "R" (or a lower U) means more resistance to heat flow, that is, the higher the R-value (or the lower the U-value) the greater the insulating value of the material.

2021年9月17日 · 2009 IRC Only: The first R-value applies to continuous insulation, the second to framing cavity insulation; either insulation meets the requirement. 2018 and 2021 IECC: R-5 insulation shall be provided under the full slab area of a heated slab in addition to the required slab edge insulation R-value for slabs, as indicated in the table.

There are 8 climate zones in the USA, based on temperature and humidity levels, and for each climate zone, you have to use a specific R-value. You can use this simple chart to check in which climate zone you live: Duct Location. ASHRAE specified duct R-value insulation requirements based on where the supply and return ducts are located.

1 California has its own climate zones and can be found here. R-17 is required in CZ’s 6-8; while R-23 is required in CZ’s 1-5 and 9-16 (continuous insulation only). Refer to PIMA document for additional information for utilizing continuous and cavity insulation.

Insulation R-values are minimum acceptable levels and must be determined according to FTC rule. R-values for walls represent the sum of cavity insulation plus insulated sheathing, if any. The second R-value for mass walls applies when more than half the insulation is …

2020年2月25日 · See the chart below for minimum R-values per climate zone. Since 2009, the roofing industry has seen an R-10 increase in the majority of the states. The total minimum insulation thickness has increased from 3.5" (R-20) to 5.2" (R-30) in parts of over 40 states. The map below can help you identify climate zones within your state.