Japan Metal Building Systems Pvt. Ltd. Manufactures Lightweight Roof Top Enclosures. Japan Metal Building Systems Pvt. Ltd. Supplies roofing systems, decking sheets, cladding sheets and metal building systems. Lightweight Roof Top Enclosures has steel structure which is with metal roofing and claddings. Lightweight Roof Top Enclosures is suitable for various purposes as cafeterias, recreational centers, air-conditioned convention halls, terrace gardens or simply sit outs. These curved roof profiles look elegant and reverse which adds elegance to the structure. Apart from being functional these structures add better aesthetic to the entire building.