When determining the probable cause of crack formation, we may be dealing with a stable crack ; damage that has not developed further (caused by shrinkage and creep) or an unstable crack ; damage that is developing further (e.g., due to foundation subsidence). In these cases, the cause must first be eliminated before a proper repair can be carried out.
Characteristic is that these cracks appear relatively soon after construction and that they are located in walls with a fairly constant temperature (often internal walls).
The process of drying or hardening: drying shrinkage or hardening shrinkage occurs in new masonry due to the drying of manufacturing and construction moisture. This shrinkage occurs primarily in the first few years after construction.
Unlike the change in length under the influence of temperature and moisture, hardening shrinkage will continue for a certain period of time, but this will stop at some point.
Because indoor temperatures are less extreme, cracks in interior walls are often caused by moisture expansion and, in particular, by the use of materials that are subject to hardening shrinkage. Some of these materials include: mortar joints; sand-lime brick; and concrete.
Common problems due to drying or hardening shrinkage
Recovery from drying or hardening shrinkage
After the hardening process has taken place, the situation is stable. The cracks caused by the hardening process will not develop further. Therefore, the repair can be limited to aesthetically filling/finishing the cracks. Structural interventions are not necessary in this case.
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