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Helpful Diagrams - Barriers

Use: to block transmission noise

Physical Properties: Barriers are non-porous, high density and usually non-fibrous. Barriers are generally flexible or damped. The noise is blocked, reflected and re-routed in another direction.

Barrier materials are tested and rated for their Sound Transmission Loss capability. The number is stated in dB and the higher number signifies the better barrier.

Effectiveness is expressed as STC (Sound Transmission Class).

STC is the single number rating derived from decibel loss data at several frequencies.

Sound Transmission Class of Materials
STC
1 lb. density barrier material
26
1 lb. density transparent curtain
26
5/8" gypsum wallboard
30
3/16" steel wall
31
2" fiberglass curtain with 1 lb. barrier
29
2" thick metal panel (solid and perforated)
35
4" thick metal panel (solid and perforated)
41
12" thick concrete
53
3/8" plasterboard
26
22 gauge steel
25
Solid core wood door, closed
27
Concrete block wall, unpainted
44
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