Japan Metal Building Systems Pvt. Ltd. Supplies Single Skin Under Deck Insulated Roofing Sheet. Japan Metal Building Systems Pvt. Ltd. Manufactures roofing systems, decking sheets, cladding sheets and metal building systems. Single Skin Under Deck Insulated Roofing Sheet is made of rock wool or fiber glass. Single Skin Under Deck Insulated Roofing Sheet is both faced with vapor barrier or unfaced. This insulated roofing sheet is available in the thickness range from 25mm ,50mm , 75mm , 100mm and in the densities of 16, 20,24,32,48 Kgs./ cum which is offered based on client requirements.