British Gypsum-Isover's Hi Therm 3 provides both thermal and acoustic insulationProposed Part L amendments represent a change in the way Building Regulations operate. The focus is on "whole building methodologies," with elemental and Uvalue methods for calculating energy efficiency replaced by individual whole-building targets. They also introduce compulsory airtightness checks. Springvale's technical manager Mike Ormesher says: "There will be many …