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.

Residential roof insulation requirements.

Non residential above roof deck 19727 57th avenue east puyallup wa 98387 web. Determine your 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. See the department of energy s doe ranges for recommended levels of insulation below.

Minimum insulation r value requirements non residential above roof deck. 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. State applicable energy ashrae zone minimum r value state.

R values can be higher for foam insulation and other advanced insulation systems. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. Refer to the requirements for each building envelope area based on your project s climate zone. 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.

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 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. Insulating a roof is perhaps the easiest of all the energy saving home improvements. Mandatory minimum r 22 attic insulation unvented attics must be air sealed at roof deck eaves gables and penetrations.

Existing 3 4 inches of insulation. Alternatively you can search for your zone by county through energy gov s here. Insulation climate zone requirements. Add insulation to attic.

It s also within the capability of most diyers although not the most pleasant of tasks. 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. Ak alaska 2012 alaska building energy efficiency standard 7 r 35 8 r 35 9 r 40.