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Sound Absorption: wood floor joists
Sound absorption coefficients and NRC ratings for building materials — fiberglass, carpet, concrete, drapery, ceiling tile, etc. per ASTM C423 and ASHRAE Ch.49
| material | product variant | alpha 1000 (dimensionless) | alpha 125 (dimensionless) | alpha 2000 (dimensionless) | alpha 250 (dimensionless) | alpha 4000 (dimensionless) | alpha 500 (dimensionless) | category | description | mounting | nrc (dimensionless) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| wood floor joists | on joists | 0.07 | 0.15 | 0.06 | 0.11 | 0.07 | 0.1 | flooring | Hardwood flooring on wood joists (suspended) | Surface | 0.09 |
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