External wall cracking can appear for numerous reasons. Possible causes may be foundation movement, thermal movement and moisture uptake or loss or failure under external loads.
Historically from our experiences nine times out of ten storm water is to blame. As an example the caption below shows wall cracking. In this instance the down pipes were not connected to any form of discharge from the dwelling. The “storm water” has been pooling against the footings for some years, As a result the soil has deteriorated and caused the corner of the house to drop. Fortunately the issue can be rectified and was caught before the issue became a lot more serious.
Ideally the storm water will be redirected to prevent the issue from continuing to deteriorate and monitoring the affected area to assure the situation does not continue.