Residential Roof Insulation Requirements

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.

Residential roof insulation requirements.

Add insulation to attic. 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. 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. 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.

Insulation climate zone requirements. Determine your climate zone. Minimum insulation r value requirements by state. 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.

R values can be higher for foam insulation and other advanced insulation systems. Mandatory minimum r 22 attic insulation unvented attics must be air sealed at roof deck eaves gables and penetrations. Insulating a roof is perhaps the easiest of all the energy saving home improvements. It s also within the capability of most diyers although not the most pleasant of tasks.

Minimum insulation r value requirements non residential above roof deck. Alternatively you can search for your zone by county through energy gov s here. See the department of energy s doe ranges for recommended levels of insulation below. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities.

Recommended insulation levels for retrofitting existing wood framed buildings. Refer to the requirements for each building envelope area based on your project s climate zone. 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. Gables to be insulated as exterior walls.

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. State applicable energy ashrae zone minimum r value state. 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.