Unvented Attic Assemblies

Adequate attic ventilation is a long-standing requirement in building codes for moisture control. However, unvented attics can reduce residential energy needs, and are allowed by the code under certain conditions.

Section R806.4 of the 2009 International Residential Code® (IRC), and Section R806.5 of the 2012 IRC have requirements for unvented (conditioned) attic assemblies.

Publication Date:

Monday, October 24, 2011

cn_unvented_attic_assemblies.pdf

Document Details

Prepared by:

Pacific Northwest National Laboratory for the U.S. Department of Energy Building Energy Codes Program

Focus:

Compliance

Building Type:

Residential

Code Referenced:

2012 IRC

2009 IRC

Document type:

Code Notes

Target Audience:

Architect/Designer

Builder

Code Official

Contractor

Engineer

Unvented Attic Assemblies - Code Notes