Stc 50 Wall Assembly

Airborne sound passes.

Stc 50 wall assembly.

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. In 1961 stc was introduced as the method for comparing various wall ceiling floor door and window assemblies. Stc ratings steel stud framed walls sound transmission class stc is an integer rating of how well a framed wall attenuates sound. An empty framed wall steel studs and a layer of gypsum wallboard on each side has an stc of approximately 35.

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. Sound transmission flanking paths in build shows an stc of 50. 3 thick rockwool afb semi rigid batt insulation. Is the minimum rating by state law.

Ul v473 ulc w481 cul v473 ga wp. 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. Doubling the mass of a wall assembly does not double the stc rating. Stc 50 lab test 5 tl 93 333 alternative stc 50 wall options.

5 8 gypsum board type x 1 layer one side 2 layers on the other side. Insulation will noticeably improve the stc rating of an assembly. Staggered or double stud walls are higher rated than single stud walls. 50 stc with single layer designs.

Usg provides resources here for our ul wall assemblies for seamless integration into any construction project. Resilient channel can improve the stc rating of an assembly. Adding additional layers of drywall can improve the stc rating of an assembly. Metal stud walls perform better than wood stud walls.

Nevertheless stc 50 ings are. 3 5 8 steel studs 25 gauge spaced 16 on center. These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies. Sound tested with 2 x 4 stud wall with 1 2 12 7 mm toughrock fireguard c gypsum wallboard or densarmor plus fireguard c panels each side of assembly and 3 1 2 89 mm fiberglass insulation in stud space both sides.