Rooms formed by operable partitions must often be isolated acoustically. Sound-isolating properties of operable partitions are specified by architects in terms of sound transmission class (STC) and so advertised by the manufacturer on the basis of laboratory tests in accordance with Test Method E90 and Classification E413.

Because normal building design and construction practices are not the same as those used in acoustical laboratories, actual field performance of operable partitions will probably be less than that of test specimens. Sound transmission between areas to be isolated will occur through all of the connecting building components in addition to the operable partition, that is, floor and ceiling slabs, ceiling plenums, common walls, etc. All possible paths between the areas being isolated should have a sound insulation performance at least equal to the operable partition. Unless good acoustical practice is followed in both building design and installation, there may be a significant discrepancy between the sound isolation expected and that achieved.

Because of the complex nature of the sound flanking paths adjacent to operable partitions, it is highly recommended that all related construction details be reviewed by a person qualified in acoustical construction.

This guide does not specify requirements. However, persons desiring to write installation and construction specifications may find the contents useful in developing requirements for the site preparation, and installation practices necessary to minimize leakage and flanking sound around the operable partition.

1.1 This guide describes options of intructions recommended to be considered in preparation for, and application and installation of, operable partitions and, to some extent, in the design of the building in which they are installed. Operable partitions are those that are quickly movable.

1.2 Excluded from this guide are those partitions that are classified by the building products industry as demountable. Demountable partitions are those that are designed and installed with the intent of later being taken down and re-erected by a crew over a period of time, with the components being reusable.

1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.4 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.