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.

Residential roof insulation requirements.

See the department of energy s doe ranges for recommended levels of insulation below. Determine your climate zone. Ak alaska 2012 alaska building energy efficiency standard 7 r 35 8 r 35 9 r 40. Mandatory minimum r 22 attic insulation unvented attics must be air sealed at roof deck eaves gables and penetrations.

Minimum insulation r value requirements by state. It s also within the capability of most diyers although not the most pleasant of tasks. 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.

Insulating a roof is perhaps the easiest of all the energy saving home improvements. 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. Minimum insulation r value requirements non residential above roof deck. 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.

Non residential above roof deck 19727 57th avenue east puyallup wa 98387 web. Existing 3 4 inches of insulation. 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.

Insulation climate zone requirements. 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. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. Gables to be insulated as exterior walls.

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. 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.