Stc Of Concrete Block Wall

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.

Stc ratings for concrete masonry walls are determined using standard method for determining the sound transmission class rating for masonry walls tms 0302 ref. Sound transmission class stc provides an estimate of the acoustic performance of a wall in certain common airborne sound insulation applications. 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 painted 2 coats 2 sides.

According to the standard stc can be determined by field or laboratory testing in ac cordance with standard test methods or by calculation. Stc 0 18w 40. 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. Standard stud wall with one layer of 16mm 5 8 plasterboard.

Mate the stc for concrete ma sonry walls based on their weight. Stc is highly dependant on the construction of the partition. In general a higher stc rating blocks more noise from transmitting through a partition. 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.

Estimated stc ratings for cmu walls the stc rating of a cmu wall can be estimated based on its weight using the following formula. The stc of a wall is determined by comparing sound transmission loss stl values at various frequencies to a standard contour. 8 concrete block hollow core no wall finish. 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.

1 contains procedures for determining stc values of concrete masonry walls. Stc 20 50 234w eqn. Typical wall construction with 1 layer of 16mm 5 8 plasterboard on each side of 95x35mm 4 x 11 2 timber studs. Installing insula tion within a wall or floor ceiling cavity will improve the stc rating by about 4 6 db which is clearly noticeable1.