Proseam can be manufactured from a variety of metals and finishes in both 300mm and 400mm cover widths. The 300mm cover width is predominately used where increased spanning capabilities are required and where highly exposed climatic conditions may be experienced. The 400mm cover width is the more widely used of the two as it offers good spanning ability to suit most construction designs encountered on a regular basis and, of course, is the more cost effective of the two consisting of Less material and requiring less fixing.
Installation
The Proseam system comprises of the external sheet, which has an overlap and an underlap (see figure 1). The underlap is placed over the fixing halter, which has been mechanically fixed either to an insulation spacer system or directly back to the purlin through the liner tray (see figure 2). Also the halter can be fixed directly back to a decking system providing the mechanical fixings have been specifically designed for that purpose. A thermal pad is placed on to the base of the halter prior to fixing. This is to isolate the component from being in contact with the external sheet, creating a thermal bridge and reducing thermal transmission through the system.