Minimum Attic Insulation

The 2015 irc requires r 49 insulation for ceilings with attic spaces.

Minimum attic insulation.

R 38 shall be deemed to satisfy the requirement for r 49 wherever the full height of uncompressed r 38 insulation extends over the wall top plate at the eaves. The recommended r value has been raised from r 50 to r 60 in order to increase the insulation of the attics. For block walls interior insulation must meet or exceed r 7 8 and exterior insulation must be r 6. However there is an exception.

As mentioned please check your local codes and requirements before attempting anything on your own or simply call terminix for a free insulation inspection. According to home advisor insulating your attic can cost between 1700 to 2100. The insulation s ability to resist heat flow determines its r value. The average recommended level is 17 inches of r60.

The higher the r value the better the thermal performance of the insulation. The main factors that impact the cost are. R values identify insulation levels. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.

The greater the number the greater the resistance to heat movement. First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation. Ceiling insulation must be much higher at r 30 and a raised floor must be at least r 13. Recommended home insulation r values.

Inspecting your attic insulation. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. In zone 7 the average minimum requirement for attic insulation is 14 inches of r49 fill. The department of energy recommends these minimum r values for unfinished unconditioned attics.

Residential requirements for insulation are divided by the location in the home. The higher the r value the better the thermal performance of the insulation. R value is a measure of insulation s ability to resist heat traveling through it. The numbers are based on your house s location and climate zone.

Insulation level are specified by r value. R value is a measure of insulation s ability to resist heat flow. Add the right kind of insulation. Pa302 1 ceilings with attic spaces n1102 2 1 r402 2 1.

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. These are changes made in order to increase the energy efficiency of the home and thus also save energy. Insulation levels are specified by r value.