Stc Rated Roof Assemblies

Sound ratings shown for steel framed partitions apply to systems constructed with 25 gauge steel studs 24 o c unless otherwise noted.

Stc rated roof assemblies.

One hour fire rated partition 3. Catalog of stc and iic ratings for wall and floor ceiling assemblies russell b. One hour fire rated partition parallel to one side of min. Two hour fire rated partition.

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. Resilient channel can improve the stc rating of an assembly.

Comply with fire resistance requirements under evaluation reports of ul u336. 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. 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.

With 1 3 8 35 mm phosphate coated nails spaced 12 305 mm o c. Adding additional layers of drywall can improve the stc rating of an assembly. Horizontal edge joints and horizontal butt joints on opposite side of studs need not be staggered. Astm e90 standard test.

Based on experience the stc values are very close to those obtained for the assembly under current methods at 16 frequencies. 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. Metal stud walls perform better than wood stud walls.

Insulation will noticeably improve the stc rating of an assembly. 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. Airborne sound insulation is reported as the sound transmission class stc. Heavier gauge studs are more rigid and may not provide the same sound ratings.

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. Sound ratings gypsum board assemblies are laboratory tested to establish their sound insulation characteristics.