Page 466 - Forensic Structural Engineering Handbook

NRC 0.037 0.018 0.35 0.48 0.07 0.19 0.5 0.65 to 0.85

4000 0.07 0.025 0.25 0.35 0.1 0.2 0.4 0.43

2000 0.05 0.023 0.4 0.5 0.1 0.2 0.42 0.52

Frequency, Hz 1000 500 0.04 0.031 0.02 0.01 0.25 0.3 0.35 0.5 0.05 0.05 0.2 0.15 0.38 0.41 0.65 0.63

250 0.025 0.013 0.45 0.55 0.08 0.2 0.83 0.88

125 0.024 0.012 0.3 0..35 0.1 0.2 0.19 0.2
Masonry Sound Absorption Coefficients, Sabines lb/ft 2

Thickness, in (mm) Any Any Any Any Any Any 4 (100) 4 (100) 6–12 (150–300)

Type Unpainted Painted Unpainted Unpainted Painted Painted Unpainted Painted Painted NRC = noise reduction coefficient.

TABLE 13.5 Material Brick masonry Brick masonry CM usual low CM usual high CM usual low CM usual high CM Soundblox CM Soundblox CM Soundblox

13.12