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Sound Transmission Classification (STC)



8” Dense concrete block wall, 2 coats of paint each side” STC-52
4” Face brick, mortared together: STC-36
½” Gypsum board (both sides) to 35/8” metal studs: STC-36
Acoust-A-Pane CitiQuiet interior window: STC-38
½” Laminated CitiQuiet interior window: STC:-38
½” CitiQuiet interior window: STC:-36
¼” Laminated CitiQuiet interior window: STC:-35
¼” CitiQuiet interior window: STC:-31
1/8” CitiQuiet interior window: STC:-29
3/32” Standard wood frame window: STC-13
3/32” Standard steel casement window: STC-13		 Determining Sound Transmission Class.
To provide a single number rating for describing the sound isolation
Performance of a material, the American Society for Testing and Materials has developed the sound transmission class, or STC, rating.
STC is a single number rating derived from individual transmission losses at specified test frequencies (ASTM E-90; ASTM E-413;). It allows a preliminary comparison of the performance of various glazing materials. Final glazing selection should be based on a comparison of TL performance at all frequencies of the actual sound spectrum to be controlled.
Acoustical Performance of Glass Fabrications
  Overall Thickness Inside Outside STC Value  
Laminated
Glass




Laminated
Insulated
Glass

Double
Laminated
Insulated Glass

Non Lami
Insulated
Glass

Monolithic
Glass
 1/4"
3/8”
1/2"
5/8”
3/4”

1”
11/8”
17/16”

1”
13/4”


1/2"
1”
11/2”

1/4"
1/2"		 1/8”
1/4"
1/4"
3/8”
1/2"

1/4" Lami
3/8” Lami
1/4" Lami

1/4" Lami
1/2" Lami


1/8”
1/4"
1/4"

1/4"
1/2"
 1/8”
1/8”
1/4"
1/4"
1/4"

1/4"
1/4"
3/16”

1/4" Lami
5/16” Lami


1/8”
1/4"
1/4"
 35
36
38
40
41

39
40
42

42
46


28
35
37

31
36



.5 Airspace
.5 Airspace
1 Airspace

.5 Airspace
1 Airspace

.25 Airspace
.5 Airspace
1 Airspace

The American Society For Testing and Materials (ASTM)
The Hiher the Sound Transmission Classification (STC) values, the Greater the Noise Reduction.