<b><b>Door manufacturers have recently faced the introduction of more stringent requirements for thermal insulation, security and fire retardance. Tim Palmer takes a look at how composite doors are capturing an increasing share of the market, and the upbeat mood of producers</b></b><br><b>&amp;“Over the past year there have been a number of changes in the marketplace. Part M (disabled access) - was the first and we had developed a lower sill unit that would comply with the minimum height and angle as required by the standard,&amp;” says Paul Headen, sales and marketing director of IG. The company has the new sill available in either traditional hardwood or a new composite material - a through-coloured synthetic wood. </b><br><b>Headen adds: &amp;“We also didn&amp;’t want to interrupt the line and the head of the frame so we extended our Part M door to achieve a 2000mm high door to keep the frame height consistent.&amp;” IG offers two Part M doors 845mm and 914mm wide in smooth steel, steel woodgrain and GRP. </b><br> What about thermal requirements? &amp;“Part L was different as our products already had excellent thermal efficiency - it&amp;’s one reason why composite doors have grown so fast in the last few years,&amp;” says …