Residential Roof Insulation Requirements

Gables to be insulated as exterior walls.

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. Add insulation to attic. Alternatively you can search for your zone by county through energy gov s here. 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.

Insulating a roof is perhaps the easiest of all the energy saving home improvements. Insulation climate zone requirements. Ak alaska 2012 alaska building energy efficiency standard 7 r 35 8 r 35 9 r 40. State applicable energy ashrae zone minimum r value state.

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. Refer to the requirements for each building envelope area based on your project s climate zone. 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. R values can be higher for foam insulation and other advanced insulation systems.

Minimum insulation r value requirements non residential above roof deck. Non residential above roof deck 19727 57th avenue east puyallup wa 98387 web. 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. 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.

Recommended insulation levels for retrofitting existing wood framed buildings. Existing 3 4 inches of insulation. It s also within the capability of most diyers although not the most pleasant of tasks. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities.

Minimum insulation r value requirements by state. See the department of energy s doe ranges for recommended levels of insulation below. Determine your climate zone. Mandatory minimum r 22 attic insulation unvented attics must be air sealed at roof deck eaves gables and penetrations.