18-29-901 General.

18-29-901.1 Scope.

   The provisions of this article shall govern the materials, design, construction and installation of vent systems.

18-29-901.2 Trap seal protection.

   The plumbing system shall be provided with a system of vent piping that will permit the admission or emission of air so that the seal of any fixture trap shall not be subjected to a pneumatic pressure differential of more than 1 inch (25 mm) of water (249 Pa).

18-29-901.2.1 Venting required.

   Every trap and trapped fixture shall be vented in accordance with one of the venting methods specified in this chapter.

18-29-901.3 Chemical waste vent system.

   The vent system for a chemical waste system shall be independent of the sanitary vent system and shall terminate separately through the roof to the open air.

18-29-901.4 Use limitations.

   The plumbing vent system shall not be utilized for purposes other than the venting of the plumbing system, except that the waste of a fixture with a value of one fixture unit may be installed to wash out the base of a vent stack.

18-29-901.5 Tests.

   The vent system shall be tested in accordance with Sections 18-29-312.1 through 18-29-312.2.

18-29-901.6 Protection from freezing.

   All vent pipes shall be adequately protected from freezing or adequately sized to account for frost build- up.

18-29-902 Materials.

18-29-902.1 Vents.

   The materials and methods utilized for the construction and installation of venting systems shall comply with the applicable provisions of Section 18-29-702.

(Amend Coun. J. 10-14-21, p. 37722, Art. IX, § 1)

18-29-902.2 Sheet copper.

   Sheet copper for vent pipe flashings shall conform to ASTM B152 and shall weigh not less than 8 ounces per square foot (2.5 kg/m 2 ).