§ 3280.115. Sound transmission between multi-dwelling unit manufactured homes.
160 words·~1 min read·
/us/cfr/t24/s§ 3280.115·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
(a)Scope. This section applies to common interior walls, partitions, and floor/ceiling assemblies between adjacent dwelling units.
(b)Air-borne sound. Walls, partitions, and floor/ceiling assemblies between stories separating dwelling units from each other must have a sound transmission class
(STC)of not less than 34 for air-borne noise when tested in accordance with ASTM E90 (incorporated by reference, see § 3280.4) or calculated. Penetrations or openings in construction assemblies for piping; electrical devices; recessed cabinets; bathtubs; soffits; or heating, ventilating, or exhaust ducts must be sealed, lined, insulated or otherwise treated to maintain the required ratings. This requirement does not apply to dwelling unit entrance doors; however, such doors must be tight fitting to the frame and sill.
(c)Structure-borne sound. Floor/ceiling assemblies between stories separating dwelling units must have an impact insulation class
(IIC)rating of not less than 34 when tested in accordance with ASTM E492 (incorporated by reference, see § 3280.4). \[89 FR 75745, Sept. 16, 2024\]