Common Absorption Coefficients for Acoustical Treatments

Multi-Surface Acoustical Coefficient
Smooth Concrete – Unpainted 0.2
Smooth Concrete – Painted 0.05
Wood 0.15
Rubber 0.05
Plywood 0.25
Walls – Acoustical Coefficient
CMU – Unpainted 0.35
CMU – Painted 0.05
Brick – Unpainted 0.05
Brick – Painted 0.025
Steel – Structural 0.1
Plaster 0.05
Gypsum 0.1
Glass 0.05
Flooring – Acoustical Coefficient
Linoleum 0.05
Terrazo 0
Marble 0
Carpet on Foam Rubber 0.55
Carpet on Padding 0.3
Low Carpet 0.2
Hardwood 0.3
Treatments – Acoustical Coefficients
Cellulose Fibers (1″) 0.75
Polyurethane Foam 0.3
Semi Rigid Fiberglass (1″) 0.75
Cork Tiles 0.7
Acoustic Ceiling Tiles 0.5
Acoustics Expert

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