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.

Minimum attic insulation.

The numbers are based on your house s location and climate zone. Residential requirements for insulation are divided by the location in the home. Ceiling insulation must be much higher at r 30 and a raised floor must be at least r 13. Add the right kind of insulation.

Framed wall insulation must meet or exceed r 13. The change that occurred in the attic insulation in the ontario building code was in the minimum required r value. The insulation s ability to resist heat flow determines its r value. Recommended home insulation r values.

The main factors that impact the cost are. R value is a measure of insulation s ability to resist heat traveling through it. R values identify insulation levels. The greater the number the greater the resistance to heat movement.

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. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. The higher the r value the better the thermal performance of the insulation. The 2015 irc requires r 49 insulation for ceilings with attic spaces.

As mentioned please check your local codes and requirements before attempting anything on your own or simply call terminix for a free insulation inspection. For block walls interior insulation must meet or exceed r 7 8 and exterior insulation must be r 6. The recommended r value has been raised from r 50 to r 60 in order to increase the insulation of the attics. 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.

Inspecting your attic insulation. Insulation levels are specified by r value. The department of energy recommends these minimum r values for unfinished unconditioned attics. Insulation level are specified by r value.

In zone 7 the average minimum requirement for attic insulation is 14 inches of r49 fill. First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation. According to home advisor insulating your attic can cost between 1700 to 2100. The average recommended level is 17 inches of r60.

However there is an exception. The higher the r value the better the thermal performance of the insulation. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.