Which membrane can be used in a build-up with a polystyrene thermal insulation while still meeting BROOF(t3)?

Question

Which membrane can be used in a build-up with a polystyrene thermal insulation while still meeting BROOF(t3)?

Answer

Our portfolio includes build-ups with the most commonly used roof thermal insulations such as mineral wool, PIR insulation and polystyrene. With the mechanically fastened FATRAFOL 810/V membrane, a 120 g/m² glass-fleece separation layer must be used over the polystyrene to achieve the BROOF(t3) classification of the build-up. If the roof is to support photovoltaics, it is advisable to use polystyrene with high compressive strength — 200 kPa. Its total thickness can be up to 700 mm.