Sound Transmission Class Ratings For Concrete Masonry Walls

2 provides stc ratings for com mon wall assemblies.

Sound transmission class ratings for concrete masonry walls.

Concrete masonry walls are. Determining sound transmission ratings for masonry walls tms 0302 ref. The stcof a wall is determined by comparing sound transmission loss stl values at various frequencies to a standard contour. According to the standard stc can be determined by field or laboratory testing in ac cordance with standard test methods or by calculation.

Determining sound transmission class stc for concrete masonry sound transmission class stc provides an estimate of the acoustic performance of a wall in certain common airborne sound insulation applications. Stc ratings for concrete masonry walls are determined using standard method for determining the sound transmission class rating for masonry walls tms 0302 ref. In general the heavier a concrete masonry wall is the more effectively it will block sound transmission. Unwanted noise can be a major distraction whether at school work or home.

Sound transmission class stc provides an estimate. To achieve performance compa rable to a masonry wall a stud. Weather and sound 3 stc ratings for wall floor and window materials and assemblies 3 appendix a stc ratings a 1 walls a 1 exterior a 1 interior a 9 wooden studs a 9 metal studs a 14 floors a 16 wood a 16 concrete a 21 windows a 24 doors a 27 exterior a 27 interior a 29 appendix b references b 1. The calculation in tms 0302 is based on a best fit relationship between concrete masonry wall weight and stc based on.

1 contains procedures for determining stc values of concrete masonry walls. Stc is highly dependant on the construction of the partition. Determining sound transmission class stc for concrete masonry. The national concrete mason ry association ncma provides t h e f o l l o w i n g e q u a t i o n t o e s t i mate the stc for concrete ma sonry walls based on their weight.

In general a higher stc rating blocks more noise from transmitting through a partition. The sound transmission class stc rating provides an indication of how effectively a given wall prevents sound transmission across a range of frequencies. Sound transmission class stc for lightweight concrete masonry walls masonry wall thickness 4 inch 6 inch 8 inch 12 inch plain 40 44 45 painted 41 45 46 50 wall board 47 49 56 plastered 50 50 51 cores filled with insulation 51 composites cavity grouted 8 4 block plus 4 concrete brick plain 51 1 2 plastered on block. The sound transmission class stc is a single number rating of a material s or an assembly s ability to resist airborne sound transfer at the frequencies 125 4000 hz.