What Rating Of Insulation For Exterior Walls

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.

What rating of insulation for exterior walls. Floors and crawl spaces need a lower r value than attics but they still require a higher value than walls. Insulation level are specified by r value. What is the best r rating for 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.

Achieving greater r values in attics 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. 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.

See the department of energy s doe ranges for recommended levels of insulation below. 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. Typically a higher insulation r rating means better climate control and better energy efficiency for your home. 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.