Vented Attic Obc

Unvented attics are also said to perform better in areas where high wind events and storms are common.

Vented attic obc. Noticed one of the attic vents was not working. In warmer climates unvented attics can prevent the condensation that occurs on ductwork in some vented attic spaces. Told that the 2 attic power vents are the only attic ventilation i have the house does have vented soffits every other soffit cover is vented. The unvented attic space is completely within the building thermal envelope.

No interior class i vapor retarders are installed on the ceiling side attic floor of the unvented attic assembly or on the ceiling side of the unvented enclosed roof framing assembly where wood shingles or shakes are used a minimum 1 4 inch 6 4 mm vented airspace separates the shingles or shakes and the. No interior vapor retarders are installed on the ceiling side attic floor of the unvented attic assembly 2009 irc. Vent requirements 1 except as provided in sentence 2 the unobstructed vent area shall be not less than 1 300 of the insulated ceiling area. Where wood shingles or shakes are used a minimum inch vented air space separates the.

Help purchased home 8 years ago with 2 power attic vents. No interior class i vapor retarders are installed on the ceiling side attic floor of the unvented attic assembly 2012 irc 3. The energy needed for air conditioning and heating typically goes up 10 when ducts are in the attic ueno 2003. Vented attic it is exposed to extremes of hot and cold.

Things have been ok low energy bills house very comfortable. The ontario building code vent requirements 9 19 1 2. Joseph lstiburek from building science corporation. In high wind regions particularly in coastal areas wind driven.