To meet the increasing demand for noise reduction in factories and public buildings, the 32/1000LS and 32/1000LN sheets can be supplied for specialised acoustic applications with perforations in the large pan only or fully perforated across the full cover width. Perforated lining panels achieve a high degree of acoustic absorbency in comparison with the reflective surface of an unperforated sheet. However the performance of our cladding systems in relation to sound, or noise may be considered in respect of three distinct requirements;
The ability of a cladding system to resist the passage of sound is largely dependent on its mass. However, insulation levels are not consistent for all frequencies, low frequency sound being more difficult to exclude than that of high frequency. Sound insulation can also be affected by detail design and site workmanship i.e. badly fitting flashings can allow transmission of disproportionate volumes of noise. Care must therefore be taken at the design stage if acoustic insulation is of prime importance.
Whenever resonance or reverberation can be identified as a potential problem, an expert assessment should be made at the design stage, as modifying an existing building can be both difficult and expensive. Liner sheets can be supplied with two perforated options. This allows sound to travel through the steel liner and be absorbed into the insulation material. As less sound is reflected, the sound absorption performance is improved.
The impact of rain or hail on a roof will always produce a sound. Noise from these sources can never be totally eliminated, however, it is well established that any flexible insulation layer, directly below the external skin will have a muffling effect. Insulated systems using a sandwich construction incorporating insulation and thermal breaks will help to reduce the effects of rain drumming. Whilst cladding systems may give good performance in all of the above three areas, good performance in one respect is no guarantee of good performance in the other two. Acoustics is a highly technical subject and where it is of vital importance, expert advice should be sought by calling a member of our sales team on 01246 858222.