1.Green and environment friendly 2Lasting color,Excellent load-carrying ability 3Good sound insulation 4corrosion resistance What is Degao PVC corrugated roofing tile ... cracks nor be damaged when the supporting spacing is 660mm and 150kg of load is applied.4). Good sound insulation. The test ... .k, which is 1/310 of that of clay tile, 1/5 of that of cement roof tile, and 1/2000 of that of 0.5mm thick ...