Some flat roofs may be subject to the development of ponding over their lifetime which may submit the roof to thermal shock, algal formation and mould growth, all of which could seriously decrease the design life of the roof.
The best solution to eliminate ponding is to design an adequate fall to the roof. With a flat deck this can be achieved by using screed to falls and a flat insulation board, timber firings to calls and a flat insulation board or by using a tapered insulation system.
Tapered insulation is one of the most cost-effective methods of introducing a fall to a flat roof. It is also significantly lighter than screed to falls solutions and does not suffer from lengthy drying times.
The weight of individual boards in a PIR/PUR system is less likely to contravene manual handling regulations than a traditional fibre based insulation system.