Post-construction joint sealing, office building in Prague

After the building was completed and the temporary groundwater lowering was discontinued, it became apparent that the installed membrane waterproofing had significant leaks. Particularly affected were all construction joints in the basement area, which had not originally been specifically sealed. Water penetrated through these joints and significantly impaired the building’s usability.
To resolve this problem permanently, extensive post-construction waterproofing was carried out: To this end, the concrete was carefully drilled along all construction joints at intervals of approximately 1 meter, taking care to ensure the integrity of the membrane behind it. Subsequently, the PU injection foam resin WEBAC 151 was first injected via injection packers, followed by the PU injection resin WEBAC 1403.
This targeted procedure created distinct sections, each covering an area of approximately 50 m². Water pressure was measured in each of these sections to locate any potential defects in the membrane. Where leaks were identified, the entire affected area was injected with the aforementioned PU resins.
Within a year, a total of 20,000 m² of masonry was permanently and reliably sealed using approximately 20 tons of WEBAC PU injection resins.
The method proved to be extremely effective in permanently resolving the problem of water ingress.