Acoustic Foam Underlay Acoustic Properties \u2014 Absorption Coefficients (125Hz\u20134kHz)
Closed-cell or cross-linked polyethylene foam sheet (3-10mm) installed under laminate, engineered timber, or LVT flooring. Primarily for impact noise improvement (delta Lw 15-22 dB) rather than airborne absorption.
Absorption Coefficients by Octave Band
| Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 4000 |
|---|---|---|---|---|---|---|
| α (absorption) | 0.05 | 0.10 | 0.15 | 0.25 | 0.30 | 0.30 |
RT60 Impact
Foam underlay primarily reduces impact noise, not reverberation. Negligible effect on RT60
Manufacturers & Brands
Frequently Asked Questions
What is the NRC of Acoustic Foam Underlay?
Acoustic Foam Underlay has an NRC (Noise Reduction Coefficient) of 0.20, calculated as the arithmetic mean of absorption coefficients at 250, 500, 1000, and 2000 Hz per ASTM C423.
Where is Acoustic Foam Underlay typically used?
Acoustic Foam Underlay is typically used as a floor (underlay) treatment. Closed-cell or cross-linked polyethylene foam sheet (3-10mm) installed under laminate, engineered timber, or LVT flooring.
How much does Acoustic Foam Underlay reduce RT60?
Foam underlay primarily reduces impact noise, not reverberation. Negligible effect on RT60
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