Unvented Attic Assemblies - Code Notes

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