Stc 50 Wall Assembly

Ubc requirements for floor ceiling assemblies.

Stc 50 wall assembly.

Stc ratings steel stud framed walls sound transmission class stc is an integer rating of how well a framed wall attenuates sound. 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. Sound transmission measurement of the ability of a wall or floor assembly to isolate airborne sound and prevent it from passing from one class stc side to the other. 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.

Resilient channel can improve the stc rating of an assembly. An empty framed wall steel studs and a layer of gypsum wallboard on each side has an stc of approximately 35. Stc ratings of 50 if tested in a laboratory or 45 if tested in the field. Insulation will noticeably improve the stc rating of an assembly.

These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies. In 1961 stc was introduced as the method for comparing various wall ceiling floor door and window assemblies. Nevertheless stc 50 ings are. 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.

50 stc with single layer designs. 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. An assembly rated at stc 50 will satisfy the building code requirement. Breakaway clip facings and height of wall differ between ul design u373 and whi gp wa 120 03.

When discrepancies appear among laboratory stc ratings for essentially similar assemblies and when the discrepancies are above and below stc 50 field testing may be required to. Sound transmission flanking paths in build shows an stc of 50. Is the minimum rating by state law. Staggered or double stud walls are higher rated than single stud walls.

Transmission the passage of sound waves from its source through a vibrating medium and to a listener. The field test evaluates the dwelling s actual construction and includes all sound paths. Usg provides resources here for our ul wall assemblies for seamless integration into any construction project. Doubling the mass of a wall assembly does not double the stc rating.