Repair project office building Krausenstrasse, Berlin

Customer: Mitte Management GmbH & Co. KG in cooperation with Klingsoehr Projektmanagement GmbH

Repair project: Horizontal and vertical damp proof barriers, waterproofing, crack injections

This extensive construction project consisted of repair and waterproofing work at a large commercial building in the center of Berlin. The services delivered by CSE included the repair of the building’s waterproofing and the partial creation of new waterproofing elements, crack injection work as well as the installation of horizontal and vertical damp-proof barriers.

The building is made of brick masonry and has numerous masoned light wells in the basement, reaching down to the basement floor, each of them accompanied by pillars. To prevent the passage of moisture through the capillarity of the construction materials, CSE was hired to install horizontal damp-proof barriers in the pillars of the light wells below the ceiling of the basement as well as in one of the outer walls of the building. In addition, horizontal damp-proof barriers were installed in selected pillars and structural walls in areas intended for particularly high-quality furnishing.

To do so, cleft clinkers had to be removed from the area of the pillars, followed by a thorough surface preparation. Furthermore, a stripe of plastering was to be removed from the outer wall. The brickwork was then analyzed in detail and any voids or fragmented brickwork filled up with cement suspension. Subsequently, the horizontal damp-proof barriers were created by low-pressure injection of an epoxy resin of CSE Sales through injection channels drilled in advance. Due to their chemical formulation, the resins of CSE Sales allow sustainable waterproofing in dry, damp or wet environments. In a final step, vertical damp-proof barriers were also installed through injection of an epoxy resin of CSE Sales to create a complete sealing.

In order to seal the outer walls of the building, various preparatory steps were necessary – excavation of walls, removal of plastering, cleaning of joints and sealing with polymer-modified mortar, surface levelling etc. Upon completion, a caulking recess was created with seal mortar and eventually a cementitious sealing mud applied. Cementitious plastering was added followed by the installation of a perimeter insulation and, as the final step, the mounting of suitable drainage and protection elements.

CSE also carried out crack injection work at several pillars inside the building, using the low-pressure injection process of ChemCo Systems and epoxy resins by CSE Sales. A number of structural cracks in the brick masonry were repaired in this step of the project.

Repair project residential building Humboldtstrasse, Berlin

Customer: Grossmann Schmitz-Engels Architekten

Repair project: Residential building waterproofing

In this repair project CSE Construction successfully carried out waterproofing work at a residential building in Berlin. To achieve a high-quality and sustainable result we installed a sulphate-resistant, mineral sealing mud, which can also be used for waterproofing purposes on its own, in combination with a polymer-enhanced bituminous thick coating.

All loose and adhesion-preventing debris was removed from the excavated brickwork and the joints and voids cleared out. Then the current sealing sheeting was cut back and the joints filled with grout. Subsequently a sulphate-resistant, mineral silicification was applied to the prepared surface up to top of the soil and sealing coves created in the areas adjacent to the walls and all inside corners. All outer edges and corners were chamfered.

The building was eventually sealed with a sulphate-resistant, mineral sealing mud with Kiesol and Sulfatex Grout followed by an elastic outer seal made of a polymer-enhanced bituminous thick coating, applied up to the top of the soil.

Repair project residential house Rathenaustrasse, Berlin

Customer: WGV Haase Wohnbau GmbH

Repair project: Crack repair in brickwork using anchors in combination with the ChemCo Systems Injection Process

In this repair project cracks in clam-shell brickwork of a residential building had to be repaired. We chose a combination of different techniques in this case, using both anchors (e.g. DESOI spiral anchors) and the ChemCo Systems Injection Process. The CHIP has many suitable properties in cases like this one when dealing with rather weak structures as its low level of pressure allows a gentle repair process which does not create back pressure and still fills up cracks down to areas of around 0.01 mm width. Another advantage over other materials frequently used in similar repair projects, particularly cement paste, is that cracks do not need to be watered before the injection commences to prevent the injection material from stopping before it has gone down all the way through the cracks.

To repair the clinker brick facade using the spiral anchors the rendering was removed from the wall in the affected area and the joints cleaned out sufficiently deep. Subsequently the DESOI spiral anchors could be installed coated by the special spiral anchor grout and the joint closed with grout as well. The other parts of the building were repaired with the CSE Sales injection resins and the related injection process so that the cracks could be closed in a force-transmitting manner. In addition, suitable anchors were also used in the repair of the clam-shell brickwork and built into the wall horizontally turned by 90 degrees. With this approach CSE Construction was able to successfully conduct the crack repair in the residential building's brickwork.