Residential Roof Insulation Requirements

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.

Residential roof insulation requirements.

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. Insulating a roof is perhaps the easiest of all the energy saving home improvements. 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.

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

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. State applicable energy ashrae zone minimum r value state. Existing 3 4 inches of insulation. Recommended insulation levels for retrofitting existing wood framed buildings.

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. Minimum insulation r value requirements non residential above roof deck. Refer to the requirements for each building envelope area based on your project s climate zone.

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. Gables to be insulated as exterior walls. Insulation climate zone requirements. See the department of energy s doe ranges for recommended levels of insulation below.

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