<b><b>Stephen Hoare looks at the potential impact off the sound insulation changes on a variety of products essential to the housebuilding process</b></b><br><b>Proposed revisions to Part E are forcing product manufacturers to look not only at specifications but also at quality of workmanship on site in order to comply with the new Building Regulations.</b><br><b> Pre-completion testing of one in ten new homes will reveal how products perform in situ and whether construction methods are sound and manufacturers installation guidelines have been met. </b><br><b><b>Demanding targets</b></b><br> To provide effective sound insulation, external walls, doors and windows all have to be upgraded. Internal walls and partitions must meet demanding targets aimed at minimising sound transmission between rooms. And blocks of flats, maisonettes, semis and terraced houses must all be built in ways that ensure that separate dwellings are insulated from the noise of the neighbours. <p></p><p>Redesigned acoustic testing has highlighted the problem of low frequency noise - thumping stereo systems and heavy traffic - that causes one in five new home owners to suffer noise pollution according to a recent BRE report.</p><p> New homes have to be designed to meet a target of 47dB while bedrooms at night must conform to World Health Organisation …