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
).
18-29-902.3 Sheet lead.
Sheet lead for vent pipe flashings shall weigh not less than 3 pounds per square foot (15 kg/m
2
) for field-constructed flashings and not less than 2 1/2 pounds per square foot (12 kg/m
2
) for prefabricated flashings.