Precast Floor Assembly Sound Ratings

Flanking of sound through a floor ceiling assembly can reduce stc or iic ratings 10 points or more.

Precast floor assembly sound ratings. Isolation pads control flanking noise in ceiling floor and walls. Dupree office of noise control california department of health services berkeley california 94704 introduction building codes. Catalog of stc and iic ratings for wall and floor ceiling assemblies russell b. This catalog of sound rated wall and the purpose of the indexing system is.

Partitions and floor ceiling assemblies constructed in accordance with the diagrams shown herein are considered to have sound transmission class stc ratings and impact insulation class iic ratings of 50 as shown. Weather and sound 3 stc ratings for wall floor and window materials and assemblies 3 appendix a stc ratings a 1 walls a 1 exterior a 1 interior a 9 wooden studs a 9 metal studs a 14 floors a 16 wood a 16 concrete a 21 windows a 24 doors a 27 exterior a 27 interior a 29 appendix b references b 1. Party walls must have a minimum nic rating of 50. Sound tested with 2 x 4 stud wall with 1 2 12 7 mm toughrock fireguard c gypsum wallboard or densarmor plus fireguard c panels each side of assembly and 3 1 2 89 mm fiberglass insulation in stud space both sides.

Transmission the passage of sound waves from its source through a vibrating medium and to a listener. Floor ceiling assemblies between units must have a minimum nic and fiic rating of 50.