Stc Ratings For Floor Ceiling Assemblies

Insulation for sound fire rated assemblies.

Stc ratings for floor ceiling assemblies. In base layer and 1 5 8 2. Structure borne sound travels through wall partitions ceilings and floor ceiling assemblies. Floor and ceiling assemblies solid wood floor joist assemblies wood i joist assemblies wood truss assemblies steel joist floors sound absorption coefficients. 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.

Our range of drawings can help pros plan projects more effectively by utilizing designs for a fire rated ceiling assembly. This catalog of sound rated wall and the purpose of the indexing system is. 55 59 stc and 73 iic w c p. One hour fire rated partition 3.

In 1961 stc was introduced as the method for comparing various wall ceiling floor door and window assemblies. Astm e90 standard test. Here you can find drawings for our ul fire rated floor assemblies and ul fire rated ceiling assemblies. Dupree office of noise control california department of health services berkeley california 94704 introduction building codes.

Sound ratings gypsum board assemblies are laboratory tested to establish their sound insulation characteristics. Airborne sound passes through a space by vibrating the air. 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. Catalog of stc and iic ratings for wall and floor ceiling assemblies russell b.

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. 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. Figure 3 insulating wall cavities noticeably improves. Airborne sound insulation is reported as the sound transmission class stc.

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. One hour fire rated partition parallel to one side of min. Ul l502 cul l502 ga fc 5105 2. 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. Two hour fire rated partition. Impact sound complaints are common on floor ceiling assemblies that meet the bare minimum requirement of 50 decibels iic.