The Plumbing Code is hereby added, amended, revised, and changed as follows:
(A) Interior waste system.
(1) Horizontal and vertical interior soil and waste pipes shall be insulated for sound to a 45 STC (Sound Transmission Class) rating as tested in accordance with ASTM E 90 and 45 IIC (Impact Insulation Class) rating as tested in accordance with ASTM E 492.
(2) Exceptions.
(a) Cast iron soil and waste pipes need not be insulated.
(b) Soil and waste piping not installed above or adjacent to habitable space; or space that may reasonably be converted to habitable space in the future, does not need to be insulated.
(c) Soil and waste piping encapsulated in not less than two inches of closed cell polyurethane spray foam with a two-pound density factor may be accepted as an alternative to the requirements of division (A)(1) above.
(d) Other insulating materials meeting the requirements of division (A)(1) above may be approved upon submittal of documentation demonstrating compliance to the satisfaction of the Director of Community Development or the Director’s designee.
(B) Vertical soil pipes. Soil pipe increasers shall not protrude through the roof at a point closer than five feet from the eave, edge of a hip or gable roof, or from an outer wall of a flat roof building.
(C) Sink, washer wastes.
(1) Sink and washer wastes shall not be less than two-inch pipe.
(2) Washer standpipes shall not be less than 36 inches above the floor with the bottom of the trap not more than six inches above the floor.
(D) Concealed horizontal waste arms. Concealed horizontal waste arms are prohibited.
(E) Vent pipes.
(1) In all new work, a two-inch vent pipe shall be brought below the basement ceiling for the purpose of facilitating future improvements.
(2) Vent pipes shall be capped and readily accessible.
(F) Overhead plumbing and conversion required.
(1) No new fixture (excluding pumps) which drains into the public sanitary system by means of gravity drainage shall be permitted below grade, including floor drains.
(2) All such fixtures as described in division (F)(1) above shall discharge into a proper ejector pit and pumped into an elevated sanitary main drain or stack.
(3) In addition:
(a) Except as otherwise provided in division (F)(3)(b) below, any new building or structure and any existing building or structure that undergoes structural alteration equal to or more than 25% of the value of the building or structure before such structural alteration, shall be prohibited from the gravity drainage of any new or existing fixture below grade, including floor drains, directly into the sanitary system.
(b) Notwithstanding the provisions of division (F)(3)(a) above, and subject to the requirements of division (F)(3)(c) below, the City Engineer may, in the City Engineer’s sound professional judgment, grant an exemption from the prohibition against the use of gravity to drain fixtures or other plumbing facilities in an existing building or structure directly into the sanitary sewer system. Such exemption shall be granted only upon consideration of historic experiences, topography, utility locations and any other factors that the City Engineer may deem relevant. In addition, the City Engineer may impose such conditions and limitations on an exemption as the City Engineer deems necessary or appropriate. No such exemption shall be valid unless in writing, signed by the City Engineer, and acknowledged by the owner of the building or structure as provided in division (F)(3)(c) below. For any building or structure that receives an exemption under this division (F)(3)(b), no further changes in the plumbing of such building or structure shall be permitted unless the provisions of this division (F)(3) are satisfied or a further exemption is granted by the City Engineer pursuant to this division (F).
(c) For any building or structure using gravity to drain fixtures of other plumbing facilities directly into the sanitary sewer, no permit shall be granted for any plumbing work on such building or structure, and no exemption shall be granted pursuant to division (F)(3)(b) unless the owner of the building or structure shall have executed and delivered to the city an acknowledgment relating to the risks of such gravity drainage in a form approved from time to time by the City Attorney.
(Ord. 2015-24, passed 4-6-2015)