Minimum Residential Roof Insulation

Department of energy lists recommended minimum building insulation levels for each climate zone to promote energy efficient homes.

Minimum residential roof insulation.

Recommended insulation levels for retrofitting existing wood framed buildings. 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. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. Zones 2 3 4 5.

The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. Add insulation to attic. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process.

California for example has five zones. Pa302 2 ceilings without attic spaces n1102 2 2 r402 2 2. Minimum insulation r value requirements non residential above roof deck. For block walls interior insulation must meet or exceed r 7 8 and exterior insulation must be r 6.

Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. Where the design of the roof ceiling assembly does not allow sufficient space for the required insulation such as cathedral ceilings the minimum required insulation for such roof ceiling assemblies shall be r 30. Ceiling insulation must be much higher at r 30 and a raised floor must be at least r 13. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.

Residential requirements for insulation are divided by the location in the home. Minimum insulation r value requirements by state. Expanded polystyrene eps insulation that is used in a roofing system must be a minimum of a 1 25lb per square foot density and it must be compatible with the surrounding roofing products.