Reference surfaceLow-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Dalenbäck, Datensatz der CATT-Software, November 2000. Data-Category in CATT: CEIL_PLASTER, C: Ceilings, D: Plasterboard
Value from the PTB table, not verified
Drywall ceiling on battens with large air cavity
PTB reference data
Original description
Drywall ceiling on battens with large air cavity
Material properties
Wall distance: large air cavity
Application: ceiling
Mounting: on battens
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.10
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.20 | 0.15 | 0.10 | 0.10 | 0.05 | 0.00 |
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Value from the PTB table, not verified
NRC: 0.10 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| large air-space · plasterboard ceiling on battens | 0.10 | 0.20 | 0.15 | 0.10 | 0.08 | 0.04 | 0.02 |
Measured values as a table (1 measurement)
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