Japan Metal Building Systems Pvt. Ltd. Manufactures Crimp Curved Roofing Sheet. Japan Metal Building Systems Pvt. Ltd. Supplies roofing systems, decking sheets, cladding sheets and metal building systems. Crimp Curved Roofing Sheet is aesthetically pleasing along with better structural elements. Crimp Curved Roofing Sheet is the favorite of those who seek beauty in all spheres of life. Crimping add to strength to roofing making the sheet a structural designers favorite. Crimped roof sheets are supplied in custom lengths. The crimp further adds to economy by allowing the maximum purl in spacing of 4 meters.