Residential Roof Insulation Requirements

Recommended insulation levels for retrofitting existing wood framed buildings.

Residential roof insulation requirements.

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

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

Add insulation to attic. 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. 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. Gables to be insulated as exterior walls.

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. Existing 3 4 inches of insulation. Refer to the requirements for each building envelope area based on your project s climate zone. Determine your climate zone.

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. Non residential above roof deck 19727 57th avenue east puyallup wa 98387 web. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. Insulation climate zone 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. Insulating a roof is perhaps the easiest of all the energy saving home improvements. R values can be higher for foam insulation and other advanced insulation systems. 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.