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148 Examples of Acoustical Material Properties A p p e n d i x e Table E-1. Common sound absorption coefficients per square foot. Material 125 250 500 1000 2000 4000 NRC ½â (12 mm) suspended ACT (4 kg/m2) 0.52 0.45 0.40 0.41 0.49 0.57 0.45 1"-thick high-absorption suspended ACT (.4 lb./square feet) 0.70 0.95 0.75 0.99 1.04 1.01 0.95 50 mm acoustical fiberglass panels 0.59 0.75 0.63 0.60 0.39 0.26 0.60 1" fabric-covered rock wool panel 0.27 0.66 0.109 10.01 0.87 0.65 0.90 Spray-on cementitious material 1" thick 0.18 0.35 0.64 0.73 0.73 0.77 0.60 2"-thick perforated steel deck covering fiberglass insulation 0.10 0.21 0.79 0.98 0.95 0.86 0.75 Large panes of heavy plate glass 0.18 0.06 0.04 0.03 0.02 0.02 0.04 Gypsum board on studs 0.29 0.10 0.05 0.04 0.07 0.09 0.07 Linoleum floor 0.02 0.03 0.03 0.03 0.03 0.02 0.06 Terrazzo or concrete floor 0.01 0.01 0.015 0.02 0.02 0.02 0.016 Wood parquet on concrete floor 0.04 0.04 0.07 0.06 0.06 0.07 0.06 Carpet 35 oz./yd2, 3/32â pile, no pad 0.10 0.16 0.10 0.30 0.50 0.47 0.27 People standing (per square feet/person) 2.0 3.5 4.7 4.5 5.0 4.0 Not app. ACT: acoustical tile Source: Harris (1993) and Beranek (1986)
