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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.
Stc concrete block wall. Mass is commonly added to existing walls by adding additional layers of gypsum. For example a thick concrete wall will block more sound than a thin gypsum 2x4 wall. 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. Stc 20 50 234w eqn.
The stc of a wall is determined by comparing sound transmission loss stl values at various frequencies to a standard contour. 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. In general the heavier a concrete masonry wall is the more effectively it will block sound transmission. 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. 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. When the mass of a barrier is doubled the isolation quality or stc rating increases by approximately 5 db which is clearly noticeable.
Resilient channel can improve the stc rating of an assembly. The sound transmission class stc rating provides an indication of how effectively a given wall prevents sound transmission across a range of frequencies. The typical brick veneer construction with a layer of 10mm 3 8 plasterboard. 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.
Adding additional layers of drywall can improve the stc rating of an assembly. Metal stud walls perform better than wood stud walls. 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.
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