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One of the main advantages of using a quality underlay is the increased sound reduction properties of the resulting installation.
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All underlays will reduce sound transmitted between rooms

When considering underlays and sound the main consideration is normally the reduction of impact sound, the noise generated by foot traffic.

As a general rule, underlays which absorb the greatest amount of energy (luxury use) will be the best at reducing impact sound.

Impact sound reduction is measured according to
BS EN ISO 140-8
and the results are given a rating according to
BS EN ISO 717-2

Impact sound test result.

Product Area of Use Sound Reduction
Cush 'n' Wood Wood Floors 25 dB
Silver Lining HC/U 30 dB
C9 Contract HC/U 35-37 dB
C9 Super Contract L/U 39-42 dB
Cumulus L/U 43 dB
Cirrus L/U 39 dB
Nimbus L/U / GDU 34 dB
Roma HC/U / GDU 31 dB