Mass is commonly added to existing walls by adding additional layers of gypsum.
Stc concrete block wall.
Stc 20 50 234w eqn.
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.
Staggered stud wall construction with 3 layers of 16mm 5 8 plasterboard on studs of 95x35mm 4 x 11 2 on a 120mm 4 3 4 common base.
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.
According to the standard stc can be determined by field or laboratory testing in ac cordance with standard test methods or by calculation.
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.
The typical brick veneer construction with a layer of 10mm 3 8 plasterboard.
1 contains procedures for determining stc values of concrete masonry walls.
Adding additional layers of drywall can improve the stc rating of an assembly.
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 sound transmission class stc provides an estimate of the acoustic performance of a wall in certain common airborne sound insulation applications.
Staggered or double stud walls are higher rated than single stud walls.
Metal stud walls perform better than wood stud walls.
When the mass of a barrier is doubled the isolation quality or stc rating increases by approximately 5 db which is clearly noticeable.
For example a thick concrete wall will block more sound than a thin gypsum 2x4 wall.
Insulation will noticeably improve the stc rating of an assembly.
Installing insula tion within a wall or floor ceiling cavity will improve the stc rating by about 4 6 db which is clearly noticeable1.
Resilient channel can improve the stc rating of an assembly.
The stc of a wall is determined by comparing sound transmission loss stl values at various frequencies to a standard contour.