Handbook for Sound Engineers

116 Chapter 5

Table 5-3. Absorption Data for Common Building Materials and Acoustical Treatments (All Materials Type A
Mounting Unless Noted Otherwise)

Material 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz Source

Walls & Ceilings

Brick, unpainted 0.03 0.03 0.03 0.04 0.05 0.07 Ref. 21

Brick, painted 0.01 0.01 0.02 0.02 0.02 0.03 Ref. 21

Concrete block, unpainted 0.36 0.44 0.31 0.29 0.39 0.25 Ref. 21

Concrete block, painted 0.10 0.05 0.06 0.07 0.09 0.08 Ref. 21

One layer 13 mm (½s) GWB, Mounted on each side of 90 mm (3.5s)

metal studs. No cavity insulation

0.26 0.10 0.05 0.07 0.04 0.05 Ref. 25

Two layers 13 mm (½s) GWB. Mounted on each side of 90 mm (3.5s)

metal studs. No cavity insulation

0.15 0.08 0.06 0.07 0.07 0.05 Ref. 25

One layer 13 mm (½s) GWB. Mounted on each side of 90 mm (3.5s)

metal studs. With glass fiber cavity insulation

0.14 0.06 0.09 0.09 0.06 0.05 Ref. 25

One layer 13 mm (½s) GWB. Mounted on one side of 90 mm (3.5s)

metal studs. With or without cavity insulation

0.12 0.10 0.05 0.05 0.04 0.05 Ref. 25

Plaster over tile or brick, smooth finish 0.01 0.02 0.02 0.03 0.04 0.05 Ref. 21

Plaster on lath, rough finish 0.14 0.10 0.06 0.05 0.04 0.03 Ref. 21

Plaster on lath, smooth finish 0.14 0.10 0.06 0.04 0.04 0.03 Ref. 21

Floors

Heavy carpet without pad 0.02 0.06 0.14 0.37 0.60 0.65 Ref. 21

Heavy carpet with pad 0.08 0.24 0.57 0.69 0.71 0.73 Ref. 21

Concrete or terrazzo 0.01 0.01 0.02 0.02 0.02 0.02 Ref. 21

Linoleum, rubber, cork tile on concrete 0.02 0.03 0.03 0.03 0.03 0.02 Ref. 21

Parquet over concrete 0.04 0.04 0.07 0.06 0.06 0.07 Ref. 21

Marble or glazed tile 0.01 0.01 0.01 0.01 0.02 0.02 Ref. 21

Other

Ordinary window glass 0.35 0.25 0.18 0.12 0.07 0.04 Ref. 21

Double glazing (1.4–1.6 cm thick) 0.10 0.07 0.05 0.03 0.02 0.02 Ref. 2

Water surface 0.01 0.01 0.01 0.02 0.02 0.03 Ref. 21

Acoustical Treatments Fig.

2.5 cm (1s) Owens Corning 701 4-4 0.17 0.33 0.64 0.83 0.90 0.92 Ref. 15

2.5 cm (1s) Owens Corning 703 4-4, 4-6 0.11 0.28 0.68 0.90 0.93 0.96 Ref. 15

2.5 cm (1s) Owens Corning 705 4-4 0.02 0.27 0.63 0.85 0.93 0.95 Ref. 15

10.2 cm (4s) Owens Corning 701 4-5 0.73 1.29 1.22 1.06 1.00 0.97 Ref. 15

10.2 cm (4s) Owens Corning 703 4-5, 4-6 0.84 1.24 1.24 1.08 1.00 0.97 Ref. 15

10.2 cm (4s) Owens Corning 705 4-5 0.75 1.19 1.17 1.05 0.97 0.98 Ref. 15

5.1 cm (2s) Owens Corning 703 4-6 0.17 0.86 1.14 1.07 1.02 0.98 Ref. 15

7.6 cm (3s) Owens Corning 703 4-6 0.53 1.19 1.21 1.08 1.01 1.04 Ref. 15

12.7 cm (5s) Owens Corning 703 4-6 0.95 1.16 1.12 1.03 1.04 1.06 Ref. 15

15.2 cm (6s) Owens Corning 703 4-6 1.09 1.15 1.13 1.05 1.04 1.04 Ref. 15

2.5 cm (1s) Owens Corning. Linear Glass Cloth Board. No

airspace

4-7 0.05 0.22 0.60 0.92 0.98 0.95 Ref. 15

2.5 cm (1s) Owens Corning. Linear Glass Cloth Board.

2.5 cm (1s) airspace

4-7 0.04 0.26 0.78 1.01 1.02 0.98 Ref. 15

2.5 cm (1s) Owens Corning. Linear Glass Cloth Board.

5.1 cm (2s) airspace

4-7 0.17 0.40 0.94 1.05 0.97 0.99 Ref. 15

2.5 cm (1s) Owens Corning. Linear Glass Cloth Board.

7.6 cm (3s) airspace

4-7 0.19 0.83 1.03 1.04 0.92 1.00 Ref. 15

2.5 cm (1s) Owens Corning. Linear Glass Cloth Board.

12.7 cm (5s) airspace

4-7 0.41 0.73 1.02 0.98 0.94 0.97 Ref. 15