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.

18-29-903 Vent Stacks and Stack Vents.

18-29-903.1 Main vent required.

   Every sanitary drainage system receiving the discharge of a water closet shall have a main vent that is either a vent stack or a stack vent. Such vent shall run undiminished in size and as directly as possible from the building drain through to the open air above the roof.

18-29-903.2 Vent stack required.

   A vent stack or a main vent shall be installed with a soil or waste stack whenever continuous vents or other branch vents are required in two or more intervals.

18-29-903.3 Vent termination.

   Every vent stack or stack vent shall extend outdoors and terminate to the open air.