Poured Concrete Wall Stc Rating

The stc rating does not assess the low frequency sound transfer.

Poured concrete wall stc rating.

A wide variety of stc ratings is available with concrete masonry construction depending on wall weight wall construction and finishes. Simple concrete slabs with density around 2300 kg m 3 and thickness in the range 150 to 200 mm provide stcs from about 53 to 58. 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. 1 contains procedures for determining stc values of.

Stc 14 1w equation 1 is applicable to uncoated fine or medium textured concrete masonry and to coated coarse textured concrete masonry. Stc sound transmission class rating. Stc 0 18w 40. Sound transmission class guidance introduction the noise guidebook.

A partition is given an stc rating by measuring its transmission loss over a range of 16 different frequencies between 125 4000 hz. Because coarse textured units may allow airborne sound to enter the wall they require a surface treatment to seal at least one side of the wall. In the absence of test data standard calculation methods exist which tend to be conservative. Standard method for determining sound transmission ratings for masonry walls tms 0302 ref.

It does not matter whether the slab is a wall or a floor the airborne sound transmission is the same. W wall weight based on the average density of the masonry units the weight of mortar grout loose fill materials and the weight contributed by surface treatments.