Painted Concrete Block Acoustic Properties \u2014 Absorption Coefficients (125Hz\u20134kHz)
Standard concrete masonry unit (CMU) with painted or sealed finish. Very low absorption. Unpainted blocks have slightly higher absorption due to surface porosity, but once painted the pores are sealed. Common in schools, industrial, and commercial buildings.
Absorption Coefficients by Octave Band
| Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 4000 |
|---|---|---|---|---|---|---|
| α (absorption) | 0.10 | 0.06 | 0.05 | 0.04 | 0.04 | 0.05 |
RT60 Impact
Painted CMU walls are highly reflective. Rooms with extensive block walls require significant ceiling absorption and wall panels to achieve acceptable RT60
Frequently Asked Questions
What is the NRC of Painted Concrete Block?
Painted Concrete Block 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 Painted Concrete Block typically used?
Painted Concrete Block is typically used as a wall treatment. Standard concrete masonry unit (CMU) with painted or sealed finish.
How much does Painted Concrete Block reduce RT60?
Painted CMU walls are highly reflective. Rooms with extensive block walls require significant ceiling absorption and wall panels to achieve acceptable RT60
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