Stc Rating For Concrete Walls

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

Stc rating for concrete walls.

Insulation will noticeably improve the stc rating of an assembly. We see two walls. Area separation wall systems area separation wall submittal sheet sa925 wb2129 sheetrock shaft wall systems tested systems achieve up to 58 stc have achieved up to 4 hr. In general the stl of a concrete masonry wall increases with increasing frequency of the sound.

Resilient channel can improve the stc rating of an assembly. Sound transmission class guidance introduction the noise guidebook. 5 or 6 points in laboratory stc ratings for essentially similar assemblies. These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies.

One has an stc 47 4 solid concrete the other an stc 48 steel stud wall. Many sound transmission loss tests have been per formed on various concrete masonry walls. 1 contains procedures for determining stc values of concrete masonry walls. The standard requires a minimum laboratory stc rating of 50 for party walls and floor ceilings.

Staggered or double stud walls are higher rated than single stud walls. Mass is commonly added to existing walls by adding additional layers of gypsum. Fire resistance ratings with multi layer designs ul u415 oscillation tested to 1 million cycles to ensure structural performance. Usg provides resources here for our ul wall assemblies for seamless integration into any construction project.

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. For example a thick concrete wall will block more sound than a thin gypsum 2x4 wall. Sound transmission class or stc is an integer rating of how well a building partition attenuates airborne sound in the us it is widely used to rate interior partitions ceilings floors doors windows and exterior wall configurations. Metal stud walls perform better than wood stud walls.

According to the standard stc can be determined by field or laboratory testing in accordance with standard test methods or by calculation. Standard method for determining sound transmission ratings for masonry walls tms 0302 ref. Note that in the low frequency range important for music theaters traffic aircraft and most other real world noise sources the lower stc wall is literally 30 decibels better yet lower stc.