Exposed Metal Deck Soffit Acoustic Properties \u2014 Absorption Coefficients (125Hz\u20134kHz)
Profiled steel deck as structural floor/roof element, left exposed as the ceiling finish. Extremely reflective across all frequencies. Increasingly common in modern office and retail designs but creates significant acoustic challenges requiring baffles or clouds.
Absorption Coefficients by Octave Band
| Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 4000 |
|---|---|---|---|---|---|---|
| α (absorption) | 0.05 | 0.04 | 0.03 | 0.03 | 0.02 | 0.02 |
RT60 Impact
Exposed metal deck creates significant reverberation. Typically requires 40-60% baffle/cloud coverage to achieve RT60 compliance
Frequently Asked Questions
What is the NRC of Exposed Metal Deck Soffit?
Exposed Metal Deck Soffit has an NRC (Noise Reduction Coefficient) of 0.05, calculated as the arithmetic mean of absorption coefficients at 250, 500, 1000, and 2000 Hz per ASTM C423.
Where is Exposed Metal Deck Soffit typically used?
Exposed Metal Deck Soffit is typically used as a ceiling (structural) treatment. Profiled steel deck as structural floor/roof element, left exposed as the ceiling finish.
How much does Exposed Metal Deck Soffit reduce RT60?
Exposed metal deck creates significant reverberation. Typically requires 40-60% baffle/cloud coverage to achieve RT60 compliance
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