Residential Roof Insulation Requirements

Refer to the requirements for each building envelope area based on your project s climate zone.

Residential roof insulation requirements.

Minimum insulation r value requirements by state. 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. See the department of energy s doe ranges for recommended levels of insulation below. Gables to be insulated as exterior walls.

Insulation climate zone requirements. Mineral wool rolls are ubiquitous and cheap meaning a whole roof on a standard home could be insulated to the recommended 270mm with a spend of little more than 200. Add insulation to attic. Determine your climate zone.

Alternatively you can search for your zone by county through energy gov s here. State applicable energy ashrae zone minimum r value state. Recommended insulation levels for retrofitting existing wood framed buildings. R values can be higher for foam insulation and other advanced insulation systems.

Climate zones 1 5 and 8 16 wall assemblies must not exceed a maximum u factor of 0 051 climate zones 6 7 wall assemblies must not exceed a maximum u factor of 0 065. 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. 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. Cavity fibrous or cellulose insulation can be installed at levels up to r 15 in a 2 inch x 4 inch wall and up to r 21 in a 2 inch x 6 inch wall.

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. Minimum insulation r value requirements non residential above roof deck. Existing 3 4 inches of insulation. 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.

Ak alaska 2012 alaska building energy efficiency standard 7 r 35 8 r 35 9 r 40. Insulating a roof is perhaps the easiest of all the energy saving home improvements. 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. Mandatory minimum r 22 attic insulation unvented attics must be air sealed at roof deck eaves gables and penetrations.