APPENDIX K
SOUND TRANSMISSION


  • (The provisions contained in this appendix are not mandatory unless specifically referenced in the adopting ordinance.)

    SECTION AK101
    GENERAL

    AK101.1 General.
    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.

    SECTION AK102
    AIR-BORNE SOUND

    AK102.1 General.
    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 E 90. 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.

    AK102.1.1 Masonry.
    The sound transmission class of concrete masonry and clay masonry assemblies shall be calculated in accordance with TMS 0302 or determined through testing in accordance with ASTM E 90.

    SECTION AK103
    STRUCTURAL-BORNE SOUND

    AK103.1 General.
    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 E 492.

    SECTION AK104
    REFERENCED STANDARDS

    ASTM
    ASTM E 90—04Test Method for Laboratory
    Measurement of Air-borne Sound
    Transmission Loss of Building
    Partitions and Elements
    AK102
    ASTM E 492—04Specification for Laboratory
    Measurement of Impact Sound
    Transmission through Floor-ceiling
    Assemblies Using the Tapping
    Machine
    AK103
    The Masonry Society
    TMS 0302—07Standard for Determining
    the Sound Transmission Class Rating
    for Masonry Walls
    AK102.1.1