LAC 51:XIV.909. Vent Grades(S) and Connections

A. Grade(S). All vent and branch vent pipes shall be so graded and connected as to drip back to the soil or waste pipe by gravity. B. Vertical Rise. The vertical rise of vent pipes shall conform with the following. 1. Vertical Rise of Vent for a Horizontal Soil or Waste Pipe. Where vent pipes (including wet vent pipes) connect to a horizontal soil or waste pipe, the vent shall be taken off above the center line of the soil pipe, and the vent pipe shall rise vertically, or at an angle not exceeding 45° (0.785 rad) from the vertical, before offsetting horizontally. 2. Vertical Rise of Vent for a Vertical Soil or Waste Pipe. Where vent pipes connect at or below the lowest fixture connection, to a vertical soil or waste pipe, such vent shall be taken off at an angle not exceeding 45° (0.785 rad) to the vertical to a point at least 6 inches (152 mm) above the flood-level rim of the lowest fixture it is venting before offsetting horizontally. C. Height Above Fixtures. A connection between a vent pipe and a vent stack or stack vent shall be made at least 6 inches (152 mm) above the flood-level rim of the highest fixture served by the vent. Horizontal vent pipes forming branch vents, relief vents, or loop vents shall be at least 6 inches (152 mm) above the flood-level rim of the highest fixture served.