The water used in the production of the components of bituminous waterproofing
systems is essentially for cooling purposes. Once used, this water is returned to the environment with little notable impact, other than a slight increase in temperature.
Flat roofs (slope < 5%) generally have a significant water retention capacity compared with sloped roofs – making urban drainage systems simpler. Added vegetation cover(roof garden or an extensive green roof) over the waterproofing gives greater water-retention capacity.
Waterproofing systems with gravel protection also retain rainwater, reducing the risk of overloading urban drainage systems in the event of violent storms.
No pollution of surface water by leaching.
Water outlets of roofs with bitumen waterproofing can feed directly to surface water without the need for expensive drainage systems.
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