Multi-storey and underground car parks are exposed to severe stresses. Vehicle traffic, thrust and shear forces, moisture, freeze-thaw cycles, and chlorides from de-icing salts continuously attack the building structure. The construction of the new underground car park on Furtwänglerstraße in Ingolstadt presented an additional challenge. Due to the permanently high groundwater level of 3 to 5 m, hydrostatic pressure from behind the surfaces to be coated had to be expected. The resulting pressure of approximately 0.3 to 0.5 bar placed particular demands on the coating system and its verified resistance.

Tested system solution for hydrostatic pressure from behind

The solution was provided by MC’s OS 14 MC-DUR 2211 MB system. In addition to meeting the relevant standard requirements, the system was tested for crack bridging across cracks ranging from 0.1 to 0.5 mm while simultaneously withstanding hydrostatic pressure from behind of up to 2.5 bar. This gave the project stakeholders a reliable solution for an application for which no standardised procedure has yet been defined in the existing regulations.

The system build-up starts with the epoxy resin MC-DUR 1320 VK, which is used as a primer and can also be applied as an optional scratch coat. This is followed by MC-DUR 2211 MB, a highly flexible polyurethane resin that acts as a crack-bridging intermediate layer. The broadcast layer is produced using the polyurethane resin MC-DUR 2210 and is fully blinded with quartz sand. Finally, the surface is sealed with MC-DUR 1322. The result is a durable, mechanically resilient, and permanently protective system build-up for trafficked surfaces.