Recognised by UNESCO as a World Heritage Site, Augustusburg Castle in Brühl is a historic witness to times long past, and has to be protected. The state of North Rhine-Westphalia, which owns this historical residence, therefore issued a contract for repair and maintenance of the terrace, in order to ensure its long-term preservation. The waterproofing of countless intricate details, unpredictable weather conditions, coordination with the various technical trades and compliance with the rules and regulations for listed buildings were the biggest challenges involved in the renovation. This meant that the Triflex BWS balcony waterproofing system proved to be the optimum solution.
The system solution is suitable for use under other coverings, while its long-term resistance to alkalis and hydrolysis means that the waterproofing is not compromised or damaged by contact with mineral top layers. No additional alkali protection is necessary. The cured waterproofing resin forms a seamless and joint-free surface. Liquid application means that even complex details, such as the intricate railing posts, were waterproofed without any difficulty and integrated homogeneously into the surface. Since the liquid applied waterproofing cures rapidly, the work was able to go ahead in spite of difficult weather conditions. A European Technical Approval (ETA) and General Building Supervisory Authority Test Certificate testify to the reliability of the waterproofing system.
After an intensive preliminary planning stage, the green light was given for the restoration specialists at Michael Mohr Dachbau to begin the waterproofing work. Due to the complexity of the building site, the area was divided into three parts, which were waterproofed one at a time. Once the surface had been shot-blasted and primed, fleece-reinforced waterproofing of the details, such as wall junctions, gullies, parapet elements and joints, was carried out with Triflex ProDetail. After surface waterproofing with Triflex ProTerra and installation of a wearing layer, the contractors applied a drainage mat to the surface. The restored natural stone slabs were laid loose on the waterproofed surface.
Thanks to the successful cooperation between everyone involved in the project, the historical character of the Augustusburg Castle terrace has been retained, and the 200-year old building has been given long-term protection against moisture penetration.