Stc Rated Roof Assemblies

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Stc rated roof assemblies.

Resilient channel can improve the stc rating of an assembly. Sound ratings shown for steel framed partitions apply to systems constructed with 25 gauge steel studs 24 o c unless otherwise noted. Heavier gauge studs are more rigid and may not provide the same sound ratings. Metal stud walls perform better than wood stud walls.

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. Catalog of stc and iic ratings for wall and floor ceiling assemblies russell b. Fire rated floor ceiling assemblies using metal framing stc 50 iic 50 fire rating as shown 1.

25 gauge metal studs 24 with 1 type s drywall screws 36 o c. In 1961 stc was introduced as the method for comparing various wall ceiling floor door and window assemblies. This catalog of sound rated wall and the purpose of the indexing system is floor ceiling assemblies was compiled from to enable the user. Dupree office of noise control california department of health services berkeley california 94704 introduction building codes.

Based on experience the stc values are very close to those obtained for the assembly under current methods at 16 frequencies. Comply with fire resistance requirements under evaluation reports of ul u336. Sound ratings gypsum board assemblies are laboratory tested to establish their sound insulation characteristics. Astm e90 standard test.

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. One hour fire rated partition 3. 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. 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.

Insulation will noticeably improve the stc rating of an assembly. One hour fire rated partition parallel to one side of min. 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. Staggered or double stud walls are higher rated than single stud walls.

Two hour fire rated partition. Horizontal edge joints and horizontal butt joints on opposite side of studs need not be staggered.