|
Floor materials
|
125 Hz
|
250 Hz
|
500 Hz
|
1 kHz
|
2 kHz
|
4 kHz
|
|
carpet
|
0.01
|
0.02
|
0.06
|
0.15
|
0.25
|
0.45
|
|
Concrete (unpainted, rough finish)
|
0.01
|
0.02
|
0.04
|
0.06
|
0.08
|
0.1
|
|
Concrete (sealed or painted)
|
0.01
|
0.01
|
0.02
|
0.02
|
0.02
|
0.02
|
|
Marble or glazed tile
|
0.01
|
0.01
|
0.01
|
0.01
|
0.02
|
0.02
|
|
Vinyl tile or linoleum on concrete
|
0.02
|
0.03
|
0.03
|
0.03
|
0.03
|
0.02
|
|
Wood parquet on concrete
|
0.04
|
0.04
|
0.07
|
0.06
|
0.06
|
0.07
|
|
Wood flooring on joists
|
0.15
|
0.11
|
0.1
|
0.07
|
0.06
|
0.07
|
|
Seating materials
|
125 Hz
|
250 Hz
|
500 Hz
|
1 kHz
|
2 kHz
|
4 kHz
|
|
Benches (wooden, empty)
|
0.1
|
0.09
|
0.08
|
0.08
|
0.08
|
0.08
|
|
Benches (wooden, 2/3 occupied)
|
0.37
|
0.4
|
0.47
|
0.53
|
0.56
|
0.53
|
|
Benches (wooden, fully occupied)
|
0.5
|
0.56
|
0.66
|
0.76
|
0.8
|
0.76
|
|
Benches
(cushioned seats and backs, empty)
|
0.32
|
0.4
|
0.42
|
0.44
|
0.43
|
0.48
|
|
Benches
(cushioned seats and backs, 2/3 occupied)
|
0.44
|
0.56
|
0.65
|
0.72
|
0.72
|
0.67
|
|
Benches
(cushioned seats and backs, fully occupied)
|
0.5
|
0.64
|
0.76
|
0.86
|
0.86
|
0.76
|
|
Theater
seats (wood, empty)
|
0.03
|
0.04
|
0.05
|
0.07
|
0.08
|
0.08
|
|
Theater
seats (wood, 2/3 occupied)
|
0.34
|
0.21
|
0.28
|
0.53
|
0.56
|
0.53
|
|
Theater
seats (wood, fully occupied)
|
0.5
|
0.3
|
0.4
|
0.76
|
0.8
|
0.76
|
|
Seats
(fabric-upholsterd, empty)
|
0.49
|
0.66
|
0.8
|
0.88
|
0.82
|
0.7
|
|
Seats
(fabric-upholsterd, fully occupied)
|
0.6
|
0.74
|
0.88
|
0.96
|
0.93
|
0.85
|
|
Reflective wall materials
|
125 Hz
|
250 Hz
|
500 Hz
|
1 kHz
|
2 kHz
|
4 kHz
|
|
Brick
(natural)
|
0.03
|
0.03
|
0.03
|
0.04
|
0.05
|
0.07
|
|
Brick
(painted)
|
0.01
|
0.01
|
0.02
|
0.02
|
0.02
|
0.03
|
|
Concrete
block (coarse)
|
0.36
|
0.44
|
0.31
|
0.29
|
0.39
|
0.25
|
|
Concrete
block (painted)
|
0.1
|
0.05
|
0.06
|
0.07
|
0.09
|
0.08
|
|
Concrete
(poured, rough finish, unpainted)
|
0.01
|
0.02
|
0.04
|
0.06
|
0.08
|
0.1
|
|
Doors
(solid wood panels)
|
0.1
|
0.07
|
0.05
|
0.04
|
0.04
|
0.04
|
|
Glass
(1/4" plate, large pane)
|
0.18
|
0.06
|
0.04
|
0.03
|
0.02
|
0.02
|
|
Glass
(small pane)
|
0.04
|
0.04
|
0.03
|
0.03
|
0.02
|
0.02
|
|
Plasterboard
(12mm (1/2") paneling on studs)
|
0.29
|
0.1
|
0.06
|
0.05
|
0.04
|
0.04
|
|
Plaster
(gypsum or lime, on masonry)
|
0.01
|
0.02
|
0.02
|
0.03
|
0.04
|
0.05
|
|
Plaster
(gypsum or lime, on wood lath)
|
0.14
|
0.1
|
0.06
|
0.05
|
0.04
|
0.04
|
|
Plywood
(3mm(1/8") paneling over 31.7mm(1-1/4") airspace)
|
0.15
|
0.25
|
0.12
|
0.08
|
0.08
|
0.08
|
|
Plywood
(3mm(1/8") paneling over 57.1mm( 2-1/4") airspace)
|
0.28
|
0.2
|
0.1
|
0.1
|
0.08
|
0.08
|
|
Plywood
(5mm(3/16") paneling over 50mm(2") airspace)
|
0.38
|
0.24
|
0.17
|
0.1
|
0.08
|
0.05
|
|
Plywood
(5mm(3/16") panel, 25mm(1") fiberglass in 50mm(2") airspace)
|
0.42
|
0.36
|
0.19
|
0.1
|
0.08
|
0.05
|
|
Plywood
(6mm(1/4") paneling, airspace, light bracing)
|
0.3
|
0.25
|
0.15
|
0.1
|
0.1
|
0.1
|
|
Plywood
(10mm(3/8") paneling, airspace, light bracing)
|
0.28
|
0.22
|
0.17
|
0.09
|
0.1
|
0.11
|
|
Plywood
(19mm(3/4") paneling, airspace, light bracing)
|
0.2
|
0.18
|
0.15
|
0.12
|
0.1
|
0.1
|
|
Absorptive wall materials
|
125 Hz
|
250 Hz
|
500 Hz
|
1 kHz
|
2 kHz
|
4 kHz
|
|
Drapery
(10 oz/yd2, 340 g/m2, flat against wall)
|
0.04
|
0.05
|
0.11
|
0.18
|
0.3
|
0.35
|
|
Drapery
(14 oz/yd2, 476 g/m2, flat against wall)
|
0.05
|
0.07
|
0.13
|
0.22
|
0.32
|
0.35
|
|
Drapery
(18 oz/yd2, 612 g/m2, flat against wall)
|
0.05
|
0.12
|
0.35
|
0.48
|
0.38
|
0.36
|
|
Drapery
(14 oz/yd2, 476 g/m2, pleated 50%)
|
0.07
|
0.31
|
0.49
|
0.75
|
0.7
|
0.6
|
|
Drapery
(18 oz/yd2, 612 g/m2, pleated 50%)
|
0.14
|
0.35
|
0.53
|
0.75
|
0.7
|
0.6
|
|
Fiberglass board (25mm(1") thick)
|
0.06
|
0.2
|
0.65
|
0.9
|
0.95
|
0.98
|
|
Fiberglass
board (50mm(2") thick)
|
0.18
|
0.76
|
0.99
|
0.99
|
0.99
|
0.99
|
|
Fiberglass
board (75mm(3") thick)
|
0.53
|
0.99
|
0.99
|
0.99
|
0.99
|
0.99
|
|
Fiberglass
board (100mm(4") thick)
|
0.99
|
0.99
|
0.99
|
0.99
|
0.99
|
0.97
|
|
Open
brick pattern over 75mm(3") fiberglass
|
0.4
|
0.65
|
0.85
|
0.75
|
0.65
|
0.6
|
|
Pageboard
over 25mm(1") fiberglass board
|
0.08
|
0.32
|
0.99
|
0.76
|
0.34
|
0.12
|
|
Pageboard
over 50mm(2") fiberglass board
|
0.26
|
0.97
|
0.99
|
0.66
|
0.34
|
0.14
|
|
Pageboard
over 75mm(3") fiberglass board
|
0.49
|
0.99
|
0.99
|
0.69
|
0.37
|
0.15
|
|
Performated
metal (13% open, over 50mm(2") fiberglass)
|
0.25
|
0.64
|
0.99
|
0.97
|
0.88
|
0.92
|
|
Ceiling material
|
125 Hz
|
250 Hz
|
500 Hz
|
1 kHz
|
2 kHz
|
4 kHz
|
|
Plasterboard
(12mm(1/2") in suspended ceiling grid)
|
0.15
|
0.11
|
0.04
|
0.04
|
0.07
|
0.08
|
|
Underlay
in perforated metal panels (25mm(1") batts)
|
0.51
|
0.78
|
0.57
|
0.77
|
0.9
|
0.79
|
|
Metal
deck (perforated channels,25mm(1") batts)
|
0.19
|
0.69
|
0.99
|
0.88
|
0.52
|
0.27
|
|
Metal
deck (perforated channels, 75mm(3") batts)
|
0.73
|
0.99
|
0.99
|
0.89
|
0.52
|
0.31
|
|
Plaster
(gypsum or lime, on masonary)
|
0.01
|
0.02
|
0.02
|
0.03
|
0.04
|
0.05
|
|
Plaster
(gypsum or lime, rough finish or timber lath)
|
0.14
|
0.1
|
0.06
|
0.05
|
0.04
|
0.04
|
|
Sprayed
cellulose fiber (16mm(5/8") on solid backing)
|
0.05
|
0.16
|
0.44
|
0.79
|
0.9
|
0.91
|
|
Sprayed
cellulose fiber (25mm(1") on solid backing)
|
0.08
|
0.29
|
0.75
|
0.98
|
0.93
|
0.76
|
|
Sprayed
cellulose fiber (25mm(1") on timber lath)
|
0.47
|
0.9
|
1.1
|
1.03
|
1.05
|
1.03
|
|
Sprayed
cellulose fiber (32mm(1-1/4") on solid backing)
|
0.1
|
0.3
|
0.73
|
0.92
|
0.98
|
0.98
|
|
Sprayed
cellulose fiber (75mm(3") on solid backing)
|
0.7
|
0.95
|
1
|
0.85
|
0.85
|
0.9
|
|
Wood tongue-and-groove
roof decking
|
0.24
|
0.19
|
0.14
|
0.08
|
0.13
|
0.1
|
|
Miscellaneous surface material
|
125 Hz
|
250 Hz
|
500 Hz
|
1 kHz
|
2 kHz
|
4 kHz
|
|
People-adults
(per 1/10 person)
|
0.25
|
0.35
|
0.42
|
0.46
|
0.5
|
0.5
|
|
People-high
school students (per 1/10 person)
|
0.22
|
0.3
|
0.38
|
0.42
|
0.45
|
0.45
|
|
People-elementary
students (per 1/10 person)
|
0.18
|
0.23
|
0.28
|
0.32
|
0.35
|
0.35
|
|
Ventilating
grilles
|
0.3
|
0.4
|
0.5
|
0.5
|
0.5
|
0.4
|
|
Water
or ice surface
|
0.008
|
0.008
|
0.013
|
0.015
|
0.02
|
0.025
|