Sound Transmission Class for Masonry

Walls

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

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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

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TMS 03021.0 SCOPE

• Minimum requirements for STC

• Field or laboratory standard test methods, or

• Calculation procedure

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TMS 03024.0 DEFINITIONS

Sound Transmission Class, STC• Single number rating – ASTM E413

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Shall comply with the following ASTM standards:

• C34, C55, C56, C62, C73, C90, C126, C129, C212, C216, C652, or C744

TMS 03025.1 MASONRY UNITS

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Shall comply with ASTM C270

TMS 03025.2 MORTAR

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Shall comply with ASTM C476

TMS 03025.3 GROUT

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Shall conform to the requirements:

•General building code

• Standard

TMS 03026.0 CONSTRUCTION

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Hollow units – face shell mortared head and bed joints

Solid units – full mortared head and bed joints

TMS 0302 6.1 PLACING MORTAR AND

MASONRY UNITS

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Completely seal through-wall openings.

Prior to sealing fill gaps with:• Foam

•Cellulose fiber

•Glass fiber

•Ceramic fiber

•Mineral wool

TMS 03026.2.1 SEALING OPENINGS AND

JOINTS

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Completely seal partial-wall penetration openings and inserts.

TMS 03026.2.2 SEALING OPENINGS AND

JOINTS

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Seal the following w/elastomeric joint sealants (ASTM C920):•Control joints

• Expansion joints

• Top of walls and roof

•Roof assemblies

TMS 03026.2.3 SEALING OPENINGS AND

JOINTS

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Fill joint space behind sealant with:•Mortar

•Grout

• Foam

•Cellulose fiber

•Glass fiber

•Mineral wool

TMS 03026.2.3 SEALING OPENINGS AND

JOINTS

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TMS 0302 (Commentary)FIG. 6.2.1 ACOUSTICAL LEAKS

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TMS 0302 (Commentary)FIG. 6.2.2 SEALING AROUND

PENETRATIONS AND FIXTURES

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Determine in accordance with: 8.1 Laboratory testing – ASTM E 90

8.2 Field testing – ASTM E413

8.3 Calculation

TMS 03028.0 SOUND TRANSMISSION CLASS

RATING

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For walls greater than 3 inches

STC = 0.18W + 40 (Eq.1)

W = Wall Weight, psf

TMS 03028.3 CALCULATION

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TMS 0302 (Commentary)

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

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TMS 0302TABLE 8.3-1

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TMS 0302 (Commentary)TABLE 8.3-2 – CALCULATED STC RATINGS

FOR CONCRETE MASONRY WALLS

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EXAMPLE

Given:

W = wall weight = 41 psf

STC = 0.18W + 40

STC = 0.18(41) + 40

STC = 47.4

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NCMA TEK 13-2

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NCMA TEK 13-2