Louisiana Administrative Code
Title 51 - PUBLIC HEALTH-SANITARY CODE
Part XIV - Plumbing
Chapter 9 - Vents
Section XIV-907 - Vent Terminals

A. Roof Extension. Extensions of vent pipes through a roof shall be terminated at least 6 inches (152 mm) above the roof, except that where a roof is to be used for any purpose other than weather protection, the vent extension shall be run at least 9 feet (2743 mm) above the roof or any structure where people may congregate.

B. Frost Closure. Where there is possibility of frost closure, the vent extension through a roof shall be at least 3-inch diameter. When it is found necessary to increase the size of the vent terminal, the change in diameter shall be made at least 1 foot (305 mm) inside the building.

C. Flashings. The juncture of each vent pipe with the roof line shall be made watertight by proper flashing (see §303. G.1.b and 303.G.2.b of this code).

D. Flag Poling. Vent terminals shall not be used to support flag poles, TV aerials, or similar items, except when the piping has been anchored to the construction and approved as safe by the plumbing official.

E. Location of Vent Terminal. A vent terminal from a drainage system shall not be located directly beneath any door, window or other fresh air intake opening of the building or of an adjacent building, nor shall any such vent terminal be within 10 feet (3048 mm) horizontally of such an opening unless it is at least 2 feet (610 mm) above the top of such opening.

F. Extensions through Wall. Vent terminals extending through a wall shall terminate at least 6 inches (152 mm) above the roof and the opening shall face upward. Vent terminals shall not terminate under the overhang of the building.

G. Air Admittance Valves for Venting Plumbing Fixtures and Fixture Branches. Air admittance valves are not approved for venting of plumbing fixture traps.