Japan Metal Building Systems Pvt. Ltd. Offers Plain Galvanized Steel Decking Sheets. Japan Metal Building Systems Pvt. Ltd. Supplies roofing systems, decking sheets, cladding sheets and metal building systems. Plain Galvanized Steel Decking Sheets is a deep depth profiled metal deck sheeting used to function as permanent form-work or as a composite roof/floor slab. Plain Galvanized Steel Decking Sheets eliminates use of conventional shuttering and props for casting 50/ 100mm thick [over the crest] slabs. It is available in thickness range of 0.60 mm to 1.00 mm, and is offered in customized lengths as per requirements. It is also available in the material of CRCA sheets. This sheet provides resistance to separation of the slab from the deck sheet hence ensuring composite action.