Glass Wool Insulation Acoustic Properties \u2014 Absorption Coefficients (125Hz\u20134kHz)
Flexible glass fibre insulation batts or rolls used inside wall cavities, above suspended ceilings, or as the absorptive core of acoustic baffles. Available in densities from 10-48 kg/m³.
Absorption Coefficients by Octave Band
| Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 4000 |
|---|---|---|---|---|---|---|
| α (absorption) | 0.20 | 0.55 | 0.85 | 0.95 | 1.00 | 1.00 |
RT60 Impact
Installing 25m² of 100mm glass wool in a 100m³ room reduces RT60 by approximately 0.50s at 500Hz
Manufacturers & Brands
Frequently Asked Questions
What is the NRC of Glass Wool Insulation?
Glass Wool Insulation has an NRC (Noise Reduction Coefficient) of 0.90, calculated as the arithmetic mean of absorption coefficients at 250, 500, 1000, and 2000 Hz per ASTM C423.
Where is Glass Wool Insulation typically used?
Glass Wool Insulation is typically used as a ceiling void and wall cavity and baffle treatment. Flexible glass fibre insulation batts or rolls used inside wall cavities, above suspended ceilings, or as the absorptive core of acoustic baffles.
How much does Glass Wool Insulation reduce RT60?
Installing 25m² of 100mm glass wool in a 100m³ room reduces RT60 by approximately 0.50s at 500Hz
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