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Sound Transmission
Class (STC) An STC rating is presented in a Sound Transmission
Loss test report and provides a standardized industry-wide
methodology for comparing the sound reduction effectiveness of
sound walls, doors and windows.
Transmission Loss Report:
STC=72
Sound Transmission Loss Test
[RAL - TL97-199]
Conducted: 6 August 1997
Test Method
Unless otherwise designated, the measurements reported below
were made with all facilities and procedures in explicit
conformity with the ASTM Designations E90-90 and E413-87, as
well as other pertinent standards. Riverbank Acoustical
Laboratories has been accredited by the U.S. Department of
Commerce, National Institute of Standards and Technology (NIST)
under the National Voluntary Laboratory Accreditation Program (NVLAP)
for this test procedure. A description of the measuring
technique is available separately. The microphone used was a
Breul & Kjaer serial number 951371.
Description of the Specimen
The test specimen was designated by the manufacturer as a Troy
Ultra 300 Wall with 10" steel studs. The overall dimensions of
the specimen were nominally 4.27 m (168 in.) wide by 2.74 m (108
in.) long and 544 mm (21.4 in.) thick. The specimen was
constructed in the laboratory's 4.27 m (14 ft.) by 2.74 m (9
ft.) test opening and was sealed on the periphery (both sides)
with a dense mastic. The description of the specimen was as
follows: The specimen consisted of a base wall constructed of a
254 mm (10 in.) wide, 16 gauge steel stud frame with a layer of
16mm (0.625 in.) gypsum board drywall attached to the studs on
both sides. Attached to the gypsum board on the source room side
were 38 (1.5 laid directly on the test room floor. A layer of 16
mm (0.625 in) thick gypsum board was attached to the studs and a
layer of 38 mm (1.5 in.) thick, TROY WOOL was laid over the
gypsum board. Over the mineral wool and attached to the steel
studs, was a layer of 76 mm (3 in.) thick, tongue-and-groove
TROY BOARD cementious wood fiber board. The steel studs were
spaced on 610 mm (24 in.) centers and the cavities between the
studs contained 203 mm (8 in.) of mineral fiber insulation. The
weight of the specimen as calculated was 469.5 kg (1035 lbs) an
average of 79.6 kg/m2 (16.2 lbs/ft2). The area used in the
calculations was 5.9m2). The room temperature at the time of the
test was 22 C (71 F) and 59% relative humidity.
Test Results
Sound transmission loss values are tabulated at the eighteen
standard frequencies. The precision of the TL test data are
within the limits set by the ASTM Standard E90-90.
|
FREQ.
|
T.L.
|
C.L.
|
DEF.
|
|
FREQ.
|
T.L.
|
C.L.
|
DEF.
|
|
100
|
45
|
0.14
|
0
|
|
800
|
85
|
0.29
|
0
|
|
125
|
48
|
0.16
|
8
|
|
1000
|
87
|
0.25
|
0
|
|
160
|
55
|
0.31
|
4
|
|
1250
|
89
|
0.26
|
0
|
|
200
|
59
|
0.32
|
3
|
|
1600
|
89
|
0.23
|
0
|
|
250
|
62
|
0.37
|
3
|
|
2000
|
91
|
0.19
|
0
|
|
315
|
68
|
0.27
|
0
|
|
2500
|
93
|
0.18
|
0
|
|
400
|
73
|
0.26
|
0
|
|
3150
|
95
|
0.17
|
0
|
|
500
|
77
|
0.28
|
0
|
|
4000
|
95
|
0.11
|
0
|
|
630
|
79
|
0.27
|
0
|
|
5000
|
96
|
0.11
|
0
|
Abbreviation index:
FREQ = Frequency, Hertz (cps)
T.L. = Transmission Loss, dB
C.L. = Uncertainty in dB, for a 95% confidence limit
DEF. = Deficiencies, dB<STC Contour
STC = Sound Transmission Class
Additional Frequencies
Tested
| Reference
Test Number |
Sound Transmission Loss
(dB)
Frequency (Hz) |
| |
31.5
|
40
|
50
|
63
|
80
|
|
RAL-TL97-198 |
25
|
33
|
36
|
40
|
41
|
|
RAL-TL97-199 |
19
|
33
|
44
|
43
|
45
|
| RAL-TL97-200 |
23
|
26
|
20
|
26
|
26
|
|
|
