Stc Rated Roof Assemblies

Horizontal edge joints and horizontal butt joints on opposite side of studs need not be staggered.

Stc rated roof assemblies.

25 gauge metal studs 24 with 1 type s drywall screws 36 o c. This catalog of sound rated wall and the purpose of the indexing system is floor ceiling assemblies was compiled from to enable the user. One hour fire rated partition parallel to one side of min. Sound ratings shown for steel framed partitions apply to systems constructed with 25 gauge steel studs 24 o c unless otherwise noted.

Sound ratings gypsum board assemblies are laboratory tested to establish their sound insulation characteristics. Adding additional layers of drywall can improve the stc rating of an assembly. Metal stud walls perform better than wood stud walls. Heavier gauge studs are more rigid and may not provide the same sound ratings.

Insulation will noticeably improve the stc rating of an assembly. Based on experience the stc values are very close to those obtained for the assembly under current methods at 16 frequencies. In base layer and 1 5 8 2. Comply with fire resistance requirements under evaluation reports of ul u336.

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. Fire rated floor ceiling assemblies using metal framing stc 50 iic 50 fire rating as shown 1. 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. Astm e90 standard test.

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. Impact noise tested on floor ceiling systems only is reported as the impact insulation class iic. Moisture resistant assemblies aesthetic assemblies sa932 sa933 sheetrock gypsum panels submittal sheet wb1473 usg area separation walls achieve up to 60 stc offer 2 hr. Airborne sound insulation is reported as the sound transmission class stc.

Two hour fire rated partition. Resilient channel can improve the stc rating of an assembly. Catalog of stc and iic ratings for wall and floor ceiling assemblies russell b. In 1961 stc was introduced as the method for comparing various wall ceiling floor door and window assemblies.

Dupree office of noise control california department of health services berkeley california 94704 introduction building codes. 1 2 12 7 mm toughrock fireguard 45 gypsum board applied vertically or horizontally to each side of 2 x 4 wood studs 24 610 mm o c.