EcoTherm® Eco-Taper thermal insulation for flat roofs has a tapered polyisocyanurate (PIR) foam core for pond-free flat roofs.
By necessity flat roofs are never flat; the upper surface of the roof has to be tapered to allow proper and even drainage of surface water. In the past such drainage has been provided by the structure of the roof being tapered towards rainwater outlets, but subsequent settlement has often negated the minimal fall provided. The net effect has been ponding of water on the roof surface and rapid deterioration of the waterproofing membrane.