Roof Vent Height Code

Slits in the product allow for air to flow into the attic.

Roof vent height code.

The 1992 vent sizing tables below and more recent codes all require that all type b gas vents terminate above the roof with a listed cap or listed roof assembly in accordance with the manufacturer s instructions. The size of vent piping shall be determined from its length and the total number of fixture units connected thereto in accordance with table 703 2 the diameter of an individual vent shall be not less than 1 1 4 inches 32 mm nor less than one half the diameter of the drain to which it is connected. In locations known for snow the vent pipe needs to be at least 51 mm 2 in in diameter and 305 mm inside an insulated area of a building before extending through the roof. Vents in these locations also should extend 610 mm 24 in above a roof.

Access draft stops and ventilation. So only use. 2010 florida building code plumbing 904 1 roof extension. 12 4 1 extension above roofs.

Ubc 97 section 1505 attics. Quoting the irc model plumbing code. Below are building code documents which you may download. Organizations such as the nrca recommend against this roof vent style in cold climates because it can promote ice dams.

Also see chimney height clearance code separate article that compares the b vent with other chimney types. Open vent pipes that extend through a roof shall be terminated at least 18 inches 456 mm above the roof or 6 inches 152 mm above the anticipated snow accumulation whichever is greater except that where a roof is to be used for any purpose other than weather protection the vent extension shall be run at least 7 feet 2134 mm above the roof. Plumbing code citations for plumbing vent or vent stack clearance distances.