Stc 50 Rated Wall Assembly

Metal stud walls perform better than wood stud walls.

Stc 50 rated wall assembly.

Moisture resistant assemblies aesthetic assemblies sa932 sa933 sheetrock gypsum panels submittal sheet wb1473 usg area separation walls. In 1961 stc was introduced as the method for comparing various wall ceiling floor door and window assemblies. 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. Use non hardening acoustical sealant at penetrations and floor ceiling and wall intersections to prevent flanking paths for sound.

Staggered or double stud walls are higher rated than single stud walls. To view different wall assemblies click on each point below that may apply to your project. Sound tested with 2 x 4 stud wall with 1 2 12 7 mm toughrock fireguard c wallboard or densarmor plus fireguard c panels and 3 1 2 89 mm fiberglass insulation in stud space. Usg provides resources here for our ul wall assemblies for seamless integration into any construction project.

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. These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies. Insulation will noticeably improve the stc rating of an assembly. Breakaway clip facings and height of wall differ between ul design u373 and whi gp wa 120 03.

Fire resistance ratings with 3 4 ultracode core panels in steel framed partition assemblies for more information see the following brochures. 50 stc with single layer designs have achieved up to 4 hr. Performance ratings of specific assemblies in the field. Doubling the mass of a wall assembly does not double the stc rating.

To achieve maximum sound isolation from an assembly follow published construction details completely. This is usu ally because there is a pronounced dip in the test curve and the stc rating is heavily influenced by a measurement in one fre quency band. 5 or 6 points in laboratory stc ratings for essentially similar assemblies. The standard requires a minimum laboratory stc rating of 50 for party walls and floor ceilings.