... , 3.HIGHLY WATERPROOF, 4.LONG SERVICE LIFE. EPS sandwich roof panel:Technical functionUnitIndexQualificationFibre averagediameterμ m4-7GB/T13350-92Densitykg / m ... not than 11.8m3. Usage: It can be used as roof panel of workshop, factory, prefabricated home, storage, villa and ... 75 and 120mm it will increase 12m practical area, for 100m2 house, it will increase 4.16m2 Waterproof and damp resistant ...