The following standards apply to both residential condominium projects and residential condominium conversion projects.
(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, and garages must provide airborne sound insulation for walls, and both airborne and impact sound insulation for floor/ceiling assemblies.
(B) Airborne sound insulation. All wall assemblies must be of a type of construction that has a minimum rating of 55 STC (sound trans-mission class). All floor/ceiling assemblies must be of a type of construction that has a minimum rating of 55 STC. Wood floor joists and subflooring must not be continuous between separate condominium units. Penetrations or openings in the construction for piping, electrical outlets and devices, recess cabinets, bathtubs, soffits, heating, and ventilating or air-conditioning intake and exhaust ducts, and the like must be sealed, lined, insulated or otherwise treated to maintain the required rating and such treatment must be approved by the Building Official. Entrance doors to the unit must be of solid construction and, together with perimeter seals, must have a minimum rating of 33 STC. Such perimeter seals must be maintained in effective operating condition.
(C) Impact sound insulation. All separating floor/ceiling assemblies must be of a type of construction that has a minimum rating of 65 IIC (impact insulation class). Floor coverings may be included in the assembly to obtain the required ratings, but must be retained as a permanent part of the assembly and may only be replaced by another floor covering that provides the same or greater impact insulation.
(Ord. 1169, passed 2-5-07)