OS 8 floor coating for underground parki

Underground parking garage “HafenMarkt” Münster: Crack-bridging OS 8 system

Floor slab exposed to high groundwater loads

The underground parking garage of the “HafenMarkt” in Münster, which opens in 2024, offers 450 parking spaces. Because the floor slab is exposed to enormous groundwater pollution due to the proximity of the building to the central harbor, the client opted for the low-maintenance, water vapor diffusion-capable OS 8 surface protection system “StoFloor Traffic Elastic 590 EP”. Another challenge was the high mechanical load on the coating system due to frequent rolling over with loaded shopping carts. A customized wear test at the Technical University of Kaiserslautern gave the client peace of mind.

StoFloor Traffic Elastic 590 EP (StoCretec) was chosen for the approximately 12,000 square meters of flooring. The tested OS 8 system has already proven to be reliable and durable in more than 1,500 completed projects. Among other things, it consists of the high-performance StoPox 590 EP coating, a special cementitious epoxy resin. The water vapor diffusion-capable system is particularly suitable for waterproof concrete floor slabs with moisture on the back. “The groundwater level at the site varies greatly due to the immediate proximity to the central harbor, but it was also important to the client that the floor was wear-resistant and low-maintenance,” explains Michael Brunne, project manager at StoCretec, who was involved in the planning from the outset. “A conventional OS 8 system without crack-bridging properties was therefore ruled out due to the high maintenance effort required by the annual inspections and associated accompanying crack treatments prescribed by the DBV leaflet 'Parking garages and underground garages'.”

In addition, the “StoFloor Traffic Elastic 590 EP” coating system is both statically (class A3 in accordance with DIN EN 1062-7) and dynamically (class B 3.1 in accordance with DIN EN 1062-7:2004-08) crack-bridging. It therefore permanently protects the concrete substrate from water and pollutants dissolved in water, especially chlorides. “This increases the durability and cost-effectiveness of the underground parking garage, for example, it prevents possible follow-up costs that can arise from subsequent crack treatment,” explains Stefan Senz, Product Manager for Floor Coatings at StoCretec. “Such local repairs can sometimes have a significant impact on the appearance of parking structures.”

As the underground car park is also used by the customers of the adjacent Edeka supermarket, increased stress was also to be expected due to shopping carts rolling over it. “The narrow wheels of the trolleys place a point load on the floor, quite different from the tires of a car,” reports Senz. To prove that the coating can withstand this load, the manufacturer carried out a special driving abrasion test together with the 'Materials in Construction' department at the Technical University of Kaiserslautern. “As a rule, this wear test is carried out with normal car tires. We replaced the car tires with shopping cart wheels to realistically simulate the wear. The floor structure was completely intact after being driven over 150,000 times with a total load of 280 kilograms. No significant wear could be detected,” explains Senz.

The StoPox DV 100 sealant's scope for color design made it possible to create a bright and appealing atmosphere, which also increased safety during use.

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