Minimum Attic Insulation

Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.

Minimum attic insulation.

R value is a measure of insulation s ability to resist heat flow. The average recommended level is 17 inches of r60. In zone 7 the average minimum requirement for attic insulation is 14 inches of r49 fill. The 2015 irc requires r 49 insulation for ceilings with attic spaces.

Your attic should have a certain amount of insulation in it and the recommended level of insulation for your attic is dependent on where you live. Ceiling insulation must be much higher at r 30 and a raised floor must be at least r 13. The higher the r value the better the thermal performance of the insulation. 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.

The recommended r value has been raised from r 50 to r 60 in order to increase the insulation of the attics. The numbers are based on your house s location and climate zone. The change that occurred in the attic insulation in the ontario building code was in the minimum required r value. Pa302 1 ceilings with attic spaces n1102 2 1 r402 2 1.

The insulation s ability to resist heat flow determines its r value. 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. First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation.

The higher the r value the better the thermal performance of the insulation. Insulation level are specified by r value. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. Framed wall insulation must meet or exceed r 13.

For block walls interior insulation must meet or exceed r 7 8 and exterior insulation must be r 6. Residential requirements for insulation are divided by the location in the home. 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. Insulation levels are specified by r value.

Add the right kind of insulation. The main factors that impact the cost are. R value is a measure of insulation s ability to resist heat traveling through it. However there is an exception.

R values identify insulation levels. The greater the number the greater the resistance to heat movement. The department of energy recommends these minimum r values for unfinished unconditioned attics.