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RIVERBANK ACOUSTICAL LABORATORIES of IIT Research Institute

Founded 1918 by Wallace Clement Sabine

1512 Batavia Avenue, Geneva, Illinois 60134
(630) 232-0104

REPORT
Sound Transmission Loss
Test RAL‰ - TL97-343

For: American Fiberboard Association
On: Wood Stud Wall With 1/2" Fiberboard, 1/2" Gypsum Board, No Insulation
Conducted: 16 December 1997

Test Method
Unless otherwise designated, the measurements reported below were made with all facilities and procedures in explicit conformity with the ASTM Designations E90-97 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 Bruel & Kjaer serial number 951371.

Description of the Specimen
The test specimen was designated as a wood stud wall with _" fiberboard, _" gypsum board, no insulation. The overall dimensions of the sample as measured were 2.74 m (108 in.) high by 4.27 m (168 in.) wide and 140 mm (5.5 in.) thick. The specimen was constructed in the laboratory’s 2.74 m (9 ft.) by 4.27 m (14 ft.) wood-lined steel frame and was sealed on the periphery (both sides) with a dense mastic. The description of the specimen was as follows: The sample was a wood stud wall assembly that consisted of a two-by-four wood frame, studs spaced on 406 mm (16 in.) centers and attached to top and bottom plates with 8d nails. A layer of 13 mm (0.5 in.) thick sound-deadening fiberboard was applied vertically to both sides of the wood studs and attached with 38 mm (1.5 in.) galvanized roofing nails spaced on 305 mm (12 in.) centers. The fiberboard was covered with a layer of 13 mm (0.5 in.) gypsum board applied vertically with the joints staggered over the fiberboard base layer joints. The gypsum board was attached to the studs with 8d nails spaced on 203 mm (8 in.) centers. The cavities between the studs were empty. A visual inspection verified the description of the specimen. The weight of the specimen as measured was 347.2 kg (765.5 lbs.) an average of 29.7 kg/m2 (6.1 lbs/ft2). The transmission area used in the calculations was 11.7 m2 (126 ft2). The source and receiving room temperatures at the time of the test were 21 C (70±2 F) and 54±2% relative humidity.

Test Results
Sound transmission loss values are tabulated at the eighteen standard frequencies. A graphic presentation of the data and additional information appear on the following pages. The precision of the TL test data are within the limits set by the ASTM Standard E90-97.

Freq.
T.L.
C.L.
Def.
Freq.
T.L
C.L.
Def.
100
18
0.24
0
800
48
0.38
0
125
15
0.21
8
1000
52
0.28
0
160
19
0.25
7
1250
56
0.25
0
200
27
0.35
2
1600
59
0.19
0
250
31
0.33
1
2000
59
0.17
0
315
31
0.34
4
2500
53
0.20
0
400
32
0.38
6
3150
52
0.14
0
500
38
0.36
1
4000
55
0.10
0
630
45
0.29
0
5000
60
0.09
0

STC = 39

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

chartB_sound

Reviewed by: Dean Victor*, Senior Experimentalist
Submitted by: Peter E. Straus*, Senior Experimentalist

THE RESULTS REPORTED ABOVE APPLY ONLY TO THE SPCIFIC SAMPLE SUBMITTED FOR MEASUREMENT. NO RESPONSIBILITY IS ASSUMED FOR PERFORMANCE OF ANY OTHER SPECIMEN.

ACCREDITED BY DEPARTMENT OF COMMERCE, NATIONAL VOLUNTARY LABORATORY ACCREDITATION PROGRAM FOR SELECTED TEST METHODS FOR ACOUSTICS. THE LABORATORY’S ACCREDITATION OR ANY OF ITS TEST REPORTS IN NO WAY CONSTITUTES OR IMPLIES PRODUCT CERTIFICATION, APPROVAL, OR ENDORESEMENT BY NIST.

* COPIES OF ORIGINAL REPORTS WITH SIGNATURES ARE ON FILE WITH THE AMERICAN FIBERBOARD ASSOCIATION, 1210 W. NORTHWEST HIGHWAY, PALATINE, ILLINOIS 60067. (847) 934-8394.