Sound Transmission Class for Masonry Walls
Standard Method for Determining the Sound Transmission Class Rating for Masonry Walls (TMS 0302)
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
TMS 0302 1.0 SCOPE Minimum requirements for STC Field or laboratory standard test methods, or Calculation procedure
Sound Transmission Class, STC TMS 0302 4.0 DEFINITIONS Sound Transmission Class, STC Single number rating – ASTM E413
TMS 0302 5.1 MASONRY UNITS Shall comply with the following ASTM standards: C34, C55, C56, C62, C73, C90, C126, C129, C212, C216, C652, or C744
TMS 0302 5.2 MORTAR Shall comply with ASTM C270
TMS 0302 5.3 GROUT Shall comply with ASTM C476
TMS 0302 6.0 CONSTRUCTION Shall conform to the requirements: General building code Standard
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
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
TMS 0302 6.2.2 SEALING OPENINGS AND JOINTS Completely seal partial-wall penetration openings and inserts.
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
TMS 0302 6.2.3 SEALING OPENINGS AND JOINTS Fill joint space behind sealant with: Mortar Grout Foam Cellulose fiber Glass fiber Mineral wool
TMS 0302 (Commentary) FIG. 6.2.1 ACOUSTICAL LEAKS
TMS 0302 (Commentary) FIG. 6.2.2 SEALING AROUND PENETRATIONS AND FIXTURES
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
TMS 0302 8.3 CALCULATION For walls greater than 3 inches STC = 0.18W + 40 (Eq.1) W = Wall Weight, psf
TMS 0302 (Commentary)
TMS 0302 (Commentary) FIG 8.3-1 WALL WEIGHT VS. STC
TMS 0302 TABLE 8.3-1
TMS 0302 (Commentary) TABLE 8 TMS 0302 (Commentary) TABLE 8.3-2 – CALCULATED STC RATINGS FOR CONCRETE MASONRY WALLS
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
NCMA TEK 13-2
NCMA TEK 13-2