Stc Ratings For Floor Ceiling Assemblies

Impact sound complaints are common on floor ceiling assemblies that meet the bare minimum requirement of 50 decibels iic.

Stc ratings for floor ceiling assemblies.

Dupree office of noise control california department of health services berkeley california 94704 introduction building codes. Structure borne sound travels through wall partitions ceilings and floor ceiling assemblies. One hour fire rated partition parallel to one side of min. Two hour fire rated partition.

Insulation for sound fire rated assemblies. Floor and ceiling assemblies solid wood floor joist assemblies wood i joist assemblies wood truss assemblies steel joist floors sound absorption coefficients. Base layer 1 x 24 toughrock shaftliner or densglass shaftliner panels between 2 1 2 floor and ceiling j runners with t section of 2 1 2 steel c h c t or i studs between panels. Stc is calculated by taking the transmission loss tl values tested at 16 standard frequencies over the range of 125 hz to 4000 hz and plotted on a graph.

55 59 stc and 73 iic w c p. Class stc side to the other. Sound ratings gypsum board assemblies are laboratory tested to establish their sound insulation characteristics. Astm e90 standard test.

Ul l502 cul l502 ga fc 5105 2. This catalog of sound rated wall and the purpose of the indexing system is. Here you can find drawings for our ul fire rated floor assemblies and ul fire rated ceiling assemblies. Fire rated floor ceiling assemblies using metal framing stc 50 iic 50 fire rating as shown 1.

Ultimately the design and detailing of the project assembly or system is the responsibility of a professional and all projects must comply with applicable building. Iic impact isolation class astm e492 e989 and stc sound transmission class astm e336 e413 are both tests for sound traveling through the total floor ceiling assembly from an upper living area to a lower living area. In base layer and 1 5 8 2. In 1961 stc was introduced as the method for comparing various wall ceiling floor door and window assemblies.

25 gauge metal studs 24 with 1 type s drywall screws 36 o c. Impact noise tested on floor ceiling systems only is reported as the impact insulation class iic. Transmission the passage of sound waves from its source through a vibrating medium and to a listener. Figure 3 insulating wall cavities noticeably improves.

Airborne sound insulation is reported as the sound transmission class stc. Airborne sound passes through a space by vibrating the air. The stc rating shown reflects testing or evaluation of an assembly with one or more products under test conditions and may not apply to all products listed for each assembly.