Precast Floor Assembly Sound Ratings

Walls and both airborne and impact sound insulation for floor ceiling assemblies.

Precast floor assembly sound ratings.

This catalog of sound rated wall and the purpose of the indexing system is. 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. Sound transmission class stc is an integer rating of how well a building partition attenuates airborne sound in the usa it is widely used to rate interior partitions ceilings and floors doors windows and exterior wall configurations see astm international classification e413 and e90. Floor ceiling assemblies between units must have a minimum nic and fiic rating of 50.

Sound transmission measurement of the ability of a wall or floor assembly to isolate airborne sound and prevent it from passing from one class stc side to the other. 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. 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.

Party walls must have a minimum nic rating of 50. Flanking of sound through a floor ceiling assembly can reduce stc or iic ratings 10 points or more.