CastleTop® is a diamond-shaped flat metal roof shingle for a unique roof appearance. The shingle offers easy install from eave to ridge with concealed fasteners. An expanded polystyrene backer board gives strength to allow for light foot traffic during installation. In some cases, the shingles may be applied directly over the existing roof, eliminating the need for tear-off and disposal. The metal roof shingle also is suitable for walls and mansards.