| 摘要 |
<p>The sheet-type roof cladding material is particularly for a tiled roof, being laid on the rafters under the tiles. The material comprises an air-cushion sheet, whose flat surface is joined to a flat sheet, the latter being typically of aluminium. The design combines good heat insulation and ventilation characteristics and water-proofing. The air cushion sheet is pref. made of two superimposed polyethylene sheets joined to an aluminium foil.</p> |
