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.

What rating of insulation for exterior walls.

Insulation r values vary based on the type thickness and density of the insulation material. See the department of energy s doe ranges for recommended levels of insulation below. 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.

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. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. What is the best r rating for insulation. The higher the r value the better the thermal performance of the insulation.

An r value tells you how well a type of insulation can keep heat from leaving or entering your home. Typically a higher insulation r rating means better climate control and better energy efficiency for your home. Insulation level are specified by r value. Floors and crawl spaces need a lower r value than attics but they still require a higher value than walls.