Japan Metal Building Systems Pvt. Ltd. Supplies On-site Roll Forming Sheet. Japan Metal Building Systems Pvt. Ltd. Manufactures roofing systems, decking sheets, cladding sheets and metal building systems. On-site Roll Forming Sheet has the facility to extrude single length sheets up to 100 mtrs long, directly on to the roof, hence avoiding any longitudinal overlaps and ensuring no water leakage through back ingress of water. On-site Roll Forming Sheet is used to avoid overlap joints, reap the benefits of multi-span load distributions, obtain virtually flat roof with 3 in 100 slopes. It saves construction time and costs, as well as complete control & flexibility to the client / project manager.