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Specific measures need to be taken in order to implement accessible thresholds whilst offering protection from moisture damage indoors. The new heroal DS drainage system is an ideal and innovative solution. At the heart of this development lies the new basic profile, which allows the linear drainage system to be connected. It discharges up to 200 litres per metre of surface water under a high-grade steel cover without causing any back-up. The clip-on basic profile contains an attachment for the attachment foil, which guarantees waterproofing of buildings. Regardless of the type of opening – an inwards or outwards opening, constructed with framed casement frames or a base profile – the innovative drainage system is the ideal solution for all entrance doors, French doors and lifting-sliding doors, both in new buildings and renovations. The compatibility of heroal systems guarantees the use of this drainage system, which is suitable for all systems, for all large openings in the heroal D 72 door systems, heroal