Residential Roof Insulation Requirements

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.

Residential roof insulation requirements.

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. 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. Mandatory minimum r 22 attic insulation unvented attics must be air sealed at roof deck eaves gables and penetrations. Recommended insulation levels for retrofitting existing wood framed buildings.

Minimum insulation r value requirements non residential above roof deck. See the department of energy s doe ranges for recommended levels of insulation below. Refer to the requirements for each building envelope area based on your project s climate zone. 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.

Alternatively you can search for your zone by county through energy gov s here. Minimum insulation r value requirements by state. Insulating a roof is perhaps the easiest of all the energy saving home improvements. 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.

Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. State applicable energy ashrae zone minimum r value 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. 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.

Gables to be insulated as exterior walls. Existing 3 4 inches of insulation. Insulation climate zone requirements. R values can be higher for foam insulation and other advanced insulation systems.

Ak alaska 2012 alaska building energy efficiency standard 7 r 35 8 r 35 9 r 40. 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. Add insulation to attic. Determine your climate zone.