| 摘要 |
Composite water-retaining sheet material for roofs, comprising a layer of bituminous material, and a fully covering gritty layer provided on a side of the layer of bituminous material, wherein the gritty layer comprises synthetic granules. The material from which the granules have been manufactured has a melt flow index (MFI) between approximately 40 to approximately 60, wherein additionally or alternatively the bituminous material is APAO-, SEBS-, SBS- or APP-modified bituminous material. Method for manufacturing a composite water-retaining sheet material for roofs according to any one of the preceding claims, which method comprises the step of manufacturing the layer of bituminous material, after which, when the layer of bituminous material has not yet solidified, synthetic granules, particularly having a colour that is different from the colour of the layer of bituminous material, are scattered on a side of the layer. |
