Stc 50 Cmu Wall

Sound transmission class stc provides an estimate of the acoustic performance of a wall in certain common airborne sound insulation applications the stc of a wall is determined by comparing sound transmission loss stl values at various frequencies to a standard contour stl is the decrease or attenuation in sound energy in db.

Stc 50 cmu wall. Due to increased mass poured concrete and concrete blocks typically achieve higher stc values in the mid stc 40s to the mid stc 50s than equally thick framed walls. The estimate could easily be off by as much as 4 db. 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. Some of the common airborne approve another s of a similar design which sound transmission flanking paths in build shows an stc of 50.

Metal stud walls perform better than wood stud walls. Is the minimum rating by state law. Stc ratings steel stud framed walls sound transmission class stc is an integer rating of how well a framed wall attenuates sound. Area separation wall systems area separation wall submittal sheet sa925 wb2129 sheetrock shaft wall systems tested systems achieve up to 58 stc.

Stc 0 18w 40 where w pounds per square foot psf this information is provided as a tool to help estimate. Usg provides resources here for our ul wall assemblies for seamless integration into any construction project. Tunities for flanking paths or sound leaks company s test showing an stc of 49 and to occur. Insulation will noticeably improve the stc rating of an assembly.

Require an stc rating of 50 for walls and floors and an iic rating of 50 for floors. One has an stc 47 4 solid concrete the other an stc 48 steel stud wall. There are numerous other issues that need to be addressed to. Doubling the mass of a wall assembly does not double the stc rating.

The stc rating of a cmu wall can be estimated based on its weight using the following formula. To view different wall assemblies click on each point below that may apply to your project. The specified rating of 45 for field tested assemblies noted in section 1207 10 of the labc is to be used for acceptance of individual jobs only. We see two walls.

Staggered or double stud walls are higher rated than single stud walls. These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies. Weigh at least 50 less than masonry walls allowing faster easier installation for more information see the following brochures. Determining sound transmission class stc for concrete masonry.

The following notes shall be provided on the plans or in their contents delineated as details on the plans.