Fesco-Knauf Therm DTA 5.2/18-2621_V2 Range of Fesco with bitumen coating DTA 5.2-17-2386_V3 Range of Fesco without bitumen coating DTA 5.2-17-2385_V3 Tapered insulation FescoDrain 5.2_16-2493_V2 Batiboard T - ETA European Technical Assessment 220665