Residential Roof Insulation Requirements

Determine your climate zone.

Residential roof insulation requirements.

See the department of energy s doe ranges for recommended levels of insulation below. Gables to be insulated as exterior walls. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. Minimum insulation r value requirements non residential above roof deck.

Non residential above roof deck 19727 57th avenue east puyallup wa 98387 web. Minimum insulation r value requirements by state. 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.

Alternatively you can search for your zone by county through energy gov s here. 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. Add insulation to attic. It s also within the capability of most diyers although not the most pleasant of tasks.

Refer to the requirements for each building envelope area based on your project s climate zone. Insulation climate zone requirements. 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.

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

Ak alaska 2012 alaska building energy efficiency standard 7 r 35 8 r 35 9 r 40. 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. Existing 3 4 inches of insulation. Insulating a roof is perhaps the easiest of all the energy saving home improvements.