(The provisions contained in this appendix are not mandatory unless specifically referenced in the adopting ordinance.)
Wall and floor-ceiling assemblies separating dwelling units, including those separating adjacent townhouse units, shall provide air-borne sound insulation for walls, and both air-borne and impact sound insulation for floor-ceiling assemblies.
Air-borne sound insulation for wall and floor-ceiling assemblies shall meet a sound transmission class (STC) rating of 45 when tested in accordance with ASTM E90. Penetrations or openings in construction assemblies for piping ; electrical devices; recessed cabinets; bathtubs; soffits; or heating, ventilating or exhaust ducts shall be sealed, lined, insulated or otherwise treated to maintain the required ratings. Dwelling unit entrance doors, which share a common space, shall be tight fitting to the frame and sill.
Floor/ceiling assemblies between dwelling units, or between a dwelling unit and a public or service area within a structure, shall have an impact insulation class (IIC) rating of not less than 45 when tested in accordance with ASTM E492.
|ASTM E90 - 04||Test Method for Laboratory
Measurement of Air-borne Sound
Transmission Loss of Building
Partitions and Elements
|ASTM E492 - 09||Specification for Laboratory
Measurement of Impact Sound
Transmission through Floor-ceiling
Assemblies Using the Tapping
|The Masonry Society|
|TMS 0302 - 12||Standard for Determining
the Sound Transmission Class Rating
for Masonry Walls