Upgrading Flat Roof Insulation for Modern Standards
Old flat roof constructions vary in method however are generally poorly insulated. Insulation may have been installed within the rafters at the time of construction however often it is far from the current insulation levels under modern building regulations. Should you wish to improve the insulation of your flat roof the modern construction of flat roofs are generally a “warm roof” construction. To achieve this in a retofit circumstance the roof is removed down to the rafters. Rafters are chemically treated to help with drying and prevent rot etc. The roof then has a timber furrings installed where required to achieve correct falls for water run-off. Install water resistant timber sheet for strength, vapour control barrier. After this 150mm insulation board is laid on top with a single ply water proof membrane to seal the building with associated trims. Fascia, soffits and guttering/downpipes to finish.