| 摘要 |
An insulation board for an inverted roof system, where the insulation is above the waterproofing layer, comprises a first face, a second face opposite the first face, a first edge between the first and second faces, and a second edge between the first and second faces, the second edge being opposite the first edge. The distance between the first and second faces at the first edge is less than the distance between the first and second faces at the second edge, so that the board is tapered from the first edge to the second edge. The boards when laid on a flat substrate create a sloped upper surface. |
