What Rating Of Insulation For Exterior Walls

Again when choosing insulation the r value that you need depends on where you live and what part of your home you need to insulate attics need insulation with a much higher r value than walls.

What rating of insulation for exterior walls.

Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. Insulation level are specified by r value. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. While there are additional considerations such as venting and moisture problems to take into account when you insulate under floors the united states department of energy recommends an r 25 rating in cold climates and an r 11 in warmer parts of the country.

Floors and crawl spaces need a lower r value than attics but they still require a higher value than walls. Insulation r values vary based on the type thickness and density of the insulation material. Typically a higher insulation r rating means better climate control and better energy efficiency for your home. 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 table below shows what levels of insulation are cost effective for different climates and locations in the home. See the department of energy s doe ranges for recommended levels of insulation below. The higher the r value the better the thermal performance of the insulation. The r value per inch for different types of insulation varies depending on the.