<b><b>The changes to Part E have allowed the concrete and timber floor protagonists to resume battle over who has the best system for new housing. Andrew Leech reports</b></b><br><b>Despite some early anxieties most floor manufacturers seem comparatively at ease with the challenges spread out before them by the new Part E. Inevitably there has been or will be some tweaking here and there, but for most systems the prospects look good.</b><br><b><b>Timber v concrete continues</b></b><br> But of one thing you can be certain, the jousting between timber and concrete is bound to continue with each trying to gain an advantage over the other. Indeed there are already brave suggestions from both sides that the sound insulation targets may not be tough enough to force through a real change for the better. <p></p><p>Gerry Feenan, marketing director of Hanson Birchwood, which is a member of the Precast Flooring Federation, says: &amp;"The adoption of a minimum target of 3dB improvement for impact sound is on the basis that 3dB is 'probably the smallest discernible change in performance'. This would seem to be at best a token gesture to the five million or so people in the UK that previous surveys have shown to be 'bothered …