All permanent mechanical equipment such as motors, compressors, pumps and compactors which, because of its rotation, reciprocation, expansion and/or contraction, turbulence, oscillation, pulsation, impaction or detonation, is determined by the director of building and safety to be a source of structural vibration or structure-borne noise shall be shock mounted with inertia blocks or bases and/or vibration isolators in a manner approved by the director of building and safety.
Domestic appliances which are cabinet-installed or built into the individual units, such as dishwashers, garbage disposals, trash compactors, clothes washers and dryers, exhaust fans or other appliances which are determined by the director of building and safety to be a source of structural vibration or structure-borne noise, shall be isolated from cabinets and the floor or ceiling by resilient gaskets and vibration mounts approved by the director of building and safety. The cabinets in which they are installed shall be offset from the back wall with strip gasketing of felt, cork, or similar material approved by the director of building and safety. Where such appliances utilize water, flexible connectors shall be installed on all waterlines. If provision is made with the units for the installation of non-permanent appliances such as clothes washers and dryers then permanent rubber mounting bases and surface plates shall be installed in a manner approved by the director of building and safety.
(Ord. 2169 § 5, 2019)
A. 
All water supply lines within the project shall be isolated from wood, metal and other framing with pipe isolators specifically manufactured for that purpose and approved for use by the director of building and safety.
B. 
All vertical drainage lines within the project shall be isolated from touching wood, metal and other framing and all drainage pipe shall be surrounded by one inch of dense insulation board. Drainage line isolators and insulation board materials shall be specifically manufactured for that purpose and approved for use by the director of building and safety. Where vents and drain lines exist, the horizontal and vertical cavity shall be a minimum of six inches thick construction.
(Ord. 2169 § 5, 2019)
A. 
General. Wall and floor/ceiling assemblies separating units from each other or from public or quasi-public spaces such as interior corridors, laundry rooms, recreation rooms, parking areas, etc., shall provide airborne sound insulation for walls and both airborne and impact sound insulation for floor/ceiling assemblies; as specified below.
B. 
Acoustical Ratings Differences. It is understood that laboratory and field assessment of STC (sound transmission class) and IIC (impact insulation class) ratings will differ. Field-measured values (denoted as FSTC and FIIC, respectively) will, in general, be approximately five points lower than the laboratory-evaluated STC and IIC ratings. If there is a concern by the director of building and safety concerning the validity of the proposed types of construction and/or materials for sound and vibration insulation properties, an architectural acoustics (noise insulation) study may be required to be submitted for review and approval. Such a detailed architectural acoustics (noise insulation) study shall be prepared by a qualified acoustical consultant and submitted to the director of building and safety to demonstrate that all pertinent requirements below will be achieved.
1. 
Air-Borne Sound Insulation. All walls and floor/ceiling assemblies, except those directly over parking areas, shall be of a type of construction that has a composite, minimum rating of 50 STC, based on tests performed by a recognized and approved testing laboratory.
2. 
Openings and Wall/Roof Penetrations. Openings in the construction for piping, electrical outlets and devices, recess cabinets, bathtubs, soffits, heating and ventilation, and/or air conditioning in-take and exhaust ducts, and the like shall be sealed, lined, insulated or otherwise treated to maintain the required rating and such treatment shall be approved by the director of building and safety.
3. 
Doors and Windows. Entrance doors to the unit shall be of solid construction and, together with perimeter seals, shall have a minimum rating of 35 STC, based on tests performed by a recognized and approved testing laboratory. Such perimeter seals shall be maintained in effective operating condition.
4. 
Impact Sound Insulation. All separating floor/ceiling assemblies, except those directly over parking areas, shall be of a type of construction that has a minimum rating of 50 IIC, based upon tests performed by a recognized and approved testing laboratory.
(Ord. 2169 § 5, 2019)