| 摘要 |
<p>The drainage system is for flat roofs, terraces or balconies with or without heat insulation, with a top gravel layer and panels on the gravel. The covering is omitted at one or more points, pref. in the peripheral area. Here a lattice grid element is inserted, adaptable to the level of the covering via frame-type elements with height-adjustable feet. Where a gravel covering has been used, the recessed sheet metal element is connected to the grid. The water - conducting layer lies constantly below the top edge.</p> |
