Absorption Coefficents of common materials

     

125Hz

250Hz

500Hz

1kHz

2kHz

4KHz

                 

Brick, unpainted

   

0.03

0.03

0.03

0.04

0.05

0.07

8" Concrete Block, painted

   

0.10

0.05

0.06

0.07

0.09

0.08

8" Concrete Block, unpainted

   

0.36

0.44

0.31

0.29

0.39

0.25

8" Concrete Block, painted w/rc 1 layer 5/8" drywall

   

0.10

0.08

0.05

0.03

0.03

0.03

8" Concrete Block, painted w/rc 2 layer 5/8" drywall

   

0.02

0.02

0.03

0.04

0.04

0.03

Drywall, 1 layer 1/2", on 2 x 4's,

   

0.29

0.10

0.05

0.04

0.04

0.04

Drywall, 1 layer 5/8", on 2 x 4's,

   

0.15

0.08

0.05

0.03

0.03

0.03

                 

Drywall, 2 layer 5/8", on 2 x 4's,

   

0.02

0.02

0.03

0.04

0.04

0.03

                 
                 

Door hollow

   

0.28

0.20

0.10

0.10

0.08

0.08

Door solid

   

0.10

0.07

0.05

0.04

0.04

0.04

Ceiling Tile, standard

   

0.10

0.28

0.66

0.91

0.82

0.69

Fiberglass 703 rigid insulation 1" on wall
0.03
0.22
0.69
0.91
0.96
0.99
Fiberglass 703 rigid insulation 2" on wall
0.22
0.82
1.21
1.10
1.02
1.05
Fiberglass 703 rigid insulation 3" on wall
.53
1.19
1.21
1.08
1.01
1.04
Fiberglass 703 rigid insulation 4" on wall
.84
1.24
1.24
1.08
1.00
0.97
Fiberglass 703 rigid insulation 6" on wall
1.19
1.21
1.13
1.05
1.04
1.04

Floor, Concrete

   

0.01

0.01

0.01

0.02

0.02

0.02

Floor, Linoleum

   

0.02

0.03

0.03

0.03

0.03

0.02

Floor, wood on joists

   

0.15

0.11

0.10

0.07

0.06

0.07

Floor, wood parquet on concrete

   

0.04

0.04

0.07

0.06

0.06

0.07

Floor, carpet, 1/8" pile

   

0.05

0.05

0.10

0.20

0.30

0.40

Floor, carpet. 1/4" pile

   

0.05

0.10

0.15

0.30

0.50

0.55

Floor, carpet, 5/16" pile

   

0.05

0.15

0.30

0.40

0.50

0.60

Glass, normal window

   

0.35

0.25

0.18

0.12

0.07

0.04

Glass, heavy plate

   

0.18

0.06

0.04

0.03

0.02

0.02

Glass, laminated 1/4"

   

0.10

0.05

0.04

0.03

0.02

0.02

Glass, laminated 3/8" and heavier

   

0.05

0.03

0.02

0.03

0.02

0.02

Plywood, 1/4"

   

0.58

0.22

0.07

0.04

0.03

0.07

Plywood, 3/8"

   

0.28

0.22

0.17

0.09

0.10

0.11

Plaster, rough finish

   

0.02

0.03

0.04

0.05

0.04

0.03

Plaster, smooth finish

   

0.02

0.02

0.03

0.04

0.04

0.03

wood paneling

   

0.24

0.19

0.14

0.08

0.13

0.10

wood roof decking

   

0.24

0.19

0.14

0.08

0.13

0.10

Carpet, 3/32" pile

   

0.10

0.16

0.11

0.30

0.50

0.47

Carpet, 3/4" pile

   

0.15

0.17

0.12

0.32

0.52

0.57

Carpet, 3/8" pile

   

0.17

0.18

0.21

0.50

0.63

0.83

Carpet, 6/16" pile, 40oz/yd2, on hair pad

   

0.03

0.25

0.55

0.70

0.62

0.84

Carpet, 6/16" pike, 86oz/yd2, on hair pad

   

0.10

0.40

0.62

0.70

0.63

0.88

Carpet, 6/16" pike, 86oz/yd2, on hair and jute pad

   

0.20

0.50

0.68

0.72

0.65

0.90

Carpet, 20oz/yd2 , loop pile (no pad)

   

0.04

0.08

0.17

0.33

0.59

0.75

Carpet, 40oz/yd2, hair pad

   

0.10

0.19

0.35

0.79

0.69

0.79

Miscellaneous

               
                 

Person, adult

   

2.50

3.50

4.20

4.60

5.00

5.00

Chair, wood

   

0.15

0.20

0.24

0.30

0.50

0.50

Chair, theatre, heavy upholstery

   

1.50

3.40

4.00

4.50

4.75

4.50

Couch

   

3.50

4.50

5.00

5.50

5.50

4.50

Air, per 1000 cubic feet

         

0.90

2.30

7.20