2018 International Residential Code for One- and Two-Family Dwellings

Every 3 years the International Residential building Code (IRC) releases code updates. 2018 is a cycle year. Below is the attic ventilation section. Key notes/changes:

 

  • The minimum amount of attic ventilation remains 1/150 (1 square foot of Net Free Area for every 150 square feet of attic floor space. Attic floor is defined as length x width FLOOR of the attic).

  • The amount of ventilation can be reduced to 1/300 (in effect 50% less) BUT 2 conditions must be met effective 1.1.18. Previously only 1 condition had to be met. The ARMA Ventilation Task Force pushed the IRC for this change. (See below).

  • Renewed for 2018 is the requirement that “vents must be installed according to the vent manufacturer.” This includes: Don’t Mix Exhaust, give the exhaust vent proper intake, etc.

 

pdf smallRead the full 2018 Bulletin Here

Air Vent Contractor LocatorOur exclusive Contractor Locator will allow you to find contractors in your area who can assist with Air Vent product installation—including solar attic fans and skylight tubes. Click the link below to register and get started.

 

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