Field report: Sparrenberg Castle Bielefeld castle keep

The 37-metre tower of Sparrenburg Castle is a historical monument whose preservation needs to be secured for a long time. The balcony waterproofing system Triflex BTS-P ensures this with its polymethyl methacrylate (PMMA) resin base. The specialist processors of the local company Bedachungen Lohmann applied the liquid applied waterproofing to the surface of the viewing platform within just a few days. This fits like a second skin to the substrate, thus retaining the original medieval
appearance of the castle complex. Thanks to their high chemical and mechanical strength, the system solution also protects the building permanently against penetrating moisture. After refurbishment, the keep that was built in the 13th century once again offers its visitors a wide view of the surrounding area. Bielefeld’s Sparrenburg Castle is located in the Teutoburg Forest. Initially used as the administrative seat of the sovereigns, it was converted into a fortress in the 15th century. When its military importance waned at the end of the 17th century however, the decline of the building began. Sparrenburg Castle was rebuilt in 1842 with the romanticism of the castle. Today, it is not only a popular destination for excursions, but also a
designated flora and fauna area.