http://www.prowangtw.com/pvc-r....oofing/upvc-roofing/ UPVC Roofing Advantages of PVC foam corrugated sheets: Non-ToxicNo Formaldehyde, Plasticizer, Asbestos or VOC volatile organic substances Standard Size: Width 830mm (Width after assembly 750mm) Stock Length 12 Meters; (custom design length by orders.) Standard Thickness: 5mm Regular Color: Silver White PVC Corrugated Sheets Features: Excellent Soundproof Effect: Practically install the PVC corrugated sheets proved that even in heavy rain storms or inclement weather; it could effectively separate outward noise. Insulate sound 60% better than traditional color steel sheets. Ex