Semi-rigid sealing layers are used to create load-bearing surfaces in retaining systems, e.g. collecting rooms, collecting trays and surfaces, in storage, filling and handling facilities for substances hazardous to water (SFH facilities). An open-pored asphalt is grouted with sealing mortar to create the impermeable surfaces.

Drainage channel systems and penetrations in retaining systems also need to be designed to ensure that no substances hazardous to water can escape into nearby bodies of water.

Regulatory framework

Semi-rigid sealing layers, drainage channel systems and penetrations in SFH facilities fall under the Ordinance on the determination of the suitability of construction products and construction techniques under water law by means of verifications in accordance with the Building Codes of the federal states (WasBauPVO) and under the Ordinance on facilities for handling substances hazardous to water (AwSV).

DIBt grants national technical approvals (abZ) and/or general construction technique permits (aBG) for these products and construction techniques, confirming that both the construction and the water law requirements have been met. The products and construction techniques are thus deemed to be suitable in accordance with Section 63 of the Water Resources Act (WHG).

Please also note the applicable provisions of the federal states following MVV TB, B 4.1 'Technical requirements for stationary systems and system parts used in storage, filling and handling facilities for substances hazardous to water'.