Residential Roof Insulation Requirements

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.

Residential roof insulation requirements. R values can be higher for foam insulation and other advanced insulation systems. Minimum insulation r value requirements by state. Insulation climate zone requirements. Gables to be insulated as exterior walls.

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 19727 57th avenue east puyallup wa 98387 web. Minimum insulation r value requirements non residential above roof deck. Alternatively you can search for your zone by county through energy gov s here.

Add insulation to attic. Refer to the requirements for each building envelope area based on your project s climate zone. Insulating a roof is perhaps the easiest of all the energy saving home improvements. Recommended insulation levels for retrofitting existing wood framed buildings.

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. It s also within the capability of most diyers although not the most pleasant of tasks. 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. 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. Ak alaska 2012 alaska building energy efficiency standard 7 r 35 8 r 35 9 r 40. 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. See the department of energy s doe ranges for recommended levels of insulation below.

Existing 3 4 inches of insulation. 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. Mandatory minimum r 22 attic insulation unvented attics must be air sealed at roof deck eaves gables and penetrations. Determine your climate zone.