Michael Nixon
Hi Mike, Part L 1b requires the roof to be completed to current building regs ie 125mm warm roof insulation (Uvalue of .015 wmk/3). A member of the NFRC/ Competent roofer scheme can self certify for this. However building control can certify for a nominal sum. Take into consideration the fact that your fascia's will need to be replaced due to the additional roof height. Rgds Mick at Approved Rubber Roofing Contractors Ltd
