| 摘要 |
<p>A roofing element for roofs of civil and industrial buildings comprising a layer of expanded polyurethane having high thermal insulation capacity, a support made of zinc-plated sheet steel overlying said layer of expanded polyurethane and adhering thereto at all points, a thin layer of a bituminous compound and a continuous layer of stone material in fine scales caused to adhere to said thin layer of bituminous compound.</p> |
