1. Sound Transmission Class for Masonry Walls

2. Standard Method for Determining the Sound Transmission Class Rating for Masonry Walls (TMS 0302)

3. TMS 0302 1.0 Scope 2.0 Referenced Standards 3.0 Notations
4.0 Definitions
5.0 Materials
6.0 Construction
7.0 Quality Assurance
8.0 Sound Transmission Class (STC) Rating

4. TMS SCOPE
Minimum requirements for STC
Field or laboratory standard test methods, or
Calculation procedure

5. Sound Transmission Class, STC
TMS DEFINITIONS
Sound Transmission Class, STC
Single number rating – ASTM E413

6. TMS MASONRY UNITS
Shall comply with the following ASTM standards:
C34, C55, C56, C62, C73, C90, C126, C129, C212, C216, C652, or C744

7. TMS MORTAR
Shall comply with ASTM C270

8. TMS GROUT
Shall comply with ASTM C476

9. TMS CONSTRUCTION
Shall conform to the requirements:
General building code
Standard

10. TMS 0302 6.1 PLACING MORTAR AND MASONRY UNITS
Hollow units – face shell mortared head and bed joints
Solid units – full mortared head and bed joints

11. TMS 0302 6.2.1 SEALING OPENINGS AND JOINTS
Completely seal through-wall openings.
Prior to sealing fill gaps with:
Foam
Cellulose fiber
Glass fiber
Ceramic fiber
Mineral wool

12. TMS 0302 6.2.2 SEALING OPENINGS AND JOINTS
Completely seal partial-wall penetration openings and inserts.

13. TMS 0302 6.2.3 SEALING OPENINGS AND JOINTS
Seal the following w/elastomeric joint sealants (ASTM C920):
Control joints
Expansion joints
Top of walls and roof
Roof assemblies

14. TMS 0302 6.2.3 SEALING OPENINGS AND JOINTS
Fill joint space behind sealant with:
Mortar
Grout
Foam
Cellulose fiber
Glass fiber
Mineral wool

15. TMS 0302 (Commentary) FIG. 6.2.1 ACOUSTICAL LEAKS

16. TMS 0302 (Commentary) FIG. 6.2.2 SEALING AROUND PENETRATIONS AND FIXTURES

17. TMS 0302 8.0 SOUND TRANSMISSION CLASS RATING
Determine in accordance with:
8.1 Laboratory testing – ASTM E 90
8.2 Field testing – ASTM E413
8.3 Calculation

18. TMS 0302 8.3 CALCULATION For walls greater than 3 inches
STC = 0.18W (Eq.1)
W = Wall Weight, psf

19. TMS 0302 (Commentary)

20. TMS 0302 (Commentary) FIG 8.3-1 WALL WEIGHT VS. STC

21. TMS 0302 TABLE 8.3-1

22. TMS 0302 (Commentary) TABLE 8
TMS 0302 (Commentary) TABLE – CALCULATED STC RATINGS FOR CONCRETE MASONRY WALLS

23. Given: W = wall weight = 41 psf STC = 0.18W + 40 STC = 0.18(41) + 40
EXAMPLE
Given:
W = wall weight = 41 psf
STC = 0.18W + 40
STC = 0.18(41) + 40
STC = 47.4

24. NCMA TEK 13-2

25. NCMA TEK 13-2