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Standard for Determining the Sound Transmission Class Rating for Masonry Walls. AK102.1.1. California Residential Code (CRC) contains building provisions that cover construction of one- and two-family dwellings and townhouses that are three stories or less.
PURPOSE. Section 91.1206 of the 2023 Los Angeles Building Code (LABC) requires uniform minimum sound insulation standards and requirements to protect persons within designated noise sensitive buildings from.
27 sie 2019 · The main standard that addresses this is ANSI/ASA S12.60 with information about acoustical performance criteria, design requirements, and guidelines for schools. There are two parts of interest, Part 1: Permanent schools, and Part 2: Relocatable Classroom Factors (applicable for portables).
Laboratory and field tests to establish general approvals require an STC rating of 50 for walls and floors and an IIC rating of 50 for floors. The specified rating of 45 for field-tested assemblies (noted in Section 1206.10 of the LABC) is to be used for acceptance of individual jobs only.
Key materials include mass-loaded vinyl (MLV), a heavy, yet flexible material excellent for blocking airborne sounds; acoustic foam, which absorbs sound waves, reducing echo and reverberation; and fiberglass insulation, a cost-effective option for reducing sound transmission through walls and ceilings.
Airborne Sound Insulation. All such separating walls and floor-ceiling assemblies shall provide an airborne sound insulation equal to that required to meet a Sound Transmission Class (STC) of 50 (45 if field tested) as defined in UBC Standard No. 35-1.
This section provides guidelines for inspecting construction of sound walls for work specified under Section 58, “Sound Walls,” of the Standard Specifications. Sound wall types include masonry block, precast concrete panels, and alternative sound wall systems.
