Precast Floor Assembly Sound Ratings

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

Precast floor assembly sound ratings.

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

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. Catalog of stc and iic ratings for wall and floor ceiling assemblies russell b. Dupree office of noise control california department of health services berkeley california 94704 introduction building codes. Floor ceiling assemblies between units must have a minimum nic and fiic rating of 50.

Transmission the passage of sound waves from its source through a vibrating medium and to a listener. Party walls must have a minimum nic rating of 50.