Stc Rated Roof Assemblies

25 gauge metal studs 24 with 1 type s drywall screws 36 o c.

Stc rated roof assemblies. In base layer and 1 5 8 2. Comply with fire resistance requirements under evaluation reports of ul u336. Heavier gauge studs are more rigid and may not provide the same sound ratings. Resilient channel can improve the stc rating of an assembly.

In 1961 stc was introduced as the method for comparing various wall ceiling floor door and window assemblies. Based on experience the stc values are very close to those obtained for the assembly under current methods at 16 frequencies. This catalog of sound rated wall and the purpose of the indexing system is floor ceiling assemblies was compiled from to enable the user. 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.

With 1 3 8 35 mm phosphate coated nails spaced 12 305 mm o c. Impact noise tested on floor ceiling systems only is reported as the impact insulation class iic. Staggered or double stud walls are higher rated than single stud walls. Two hour fire rated partition.

Sound ratings gypsum board assemblies are laboratory tested to establish their sound insulation characteristics. Sound ratings shown for steel framed partitions apply to systems constructed with 25 gauge steel studs 24 o c unless otherwise noted. 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. Fire rated floor ceiling assemblies using metal framing stc 50 iic 50 fire rating as shown 1.

Insulation will noticeably improve the stc rating of an assembly. Dupree office of noise control california department of health services berkeley california 94704 introduction building codes. 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.

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. Adding additional layers of drywall can improve the stc rating of an assembly. 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.

One hour fire rated partition 3. 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.