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Tek 13 1c sound transmission class ratings of concrete masonry walls contains a complete discussion on determining stc ratings applicable building code requirements as well as tabulated values for various concrete masonry walls.
Stc of concrete block wall. Installing insula tion within a wall or floor ceiling cavity will improve the stc rating by about 4 6 db which is clearly noticeable1. However the additional weight added complexity of construction and poor thermal insulation tend to limit masonry wall partitions as a viable sound isolation solution in many building construction projects. Determining sound transmission class stc for concrete masonry. 1 contains procedures for determining stc values of concrete masonry walls.
8 concrete block hollow core painted 2 coats 2 sides. Stc is highly dependant on the construction of the partition. According to the standard stc can be determined by field or laboratory testing in ac cordance with standard test methods or by calculation. The stc of a wall is determined by comparing sound transmission loss stl values at various frequencies to a standard contour.
Estimated stc ratings for cmu walls the stc rating of a cmu wall can be estimated based on its weight using the following formula. In general a higher stc rating blocks more noise from transmitting through a partition. Typical wall construction with 1 layer of 16mm 5 8 plasterboard on each side of 95x35mm 4 x 11 2 timber studs. Sound transmission class stc provides an estimate of the acoustic performance of a wall in certain common airborne sound insulation applications.
Stc 20 50 234w eqn. 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. Stc hollow with insulation 52 53 56 59 corefoam masonry foam insulationis an excellent product for improving thermal and acoustic properties of walls constructed with concrete masonry units cmu. Stc ratings for concrete masonry walls are determined using standard method for determining the sound transmission class rating for masonry walls tms 0302 ref.
The calculation in tms 0302 is based on a best fit relationship between concrete masonry wall weight and stc based on a wide range of test results. Mate the stc for concrete ma sonry walls based on their weight. Stc ratings for masonry cmu walls is based on weight of the block and whether the cells are filled or not and what material it is filled with. 8 concrete block hollow core no wall finish.
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