Cracks in buildings have existed since the very first structures built by humans. And let’s be honest — even in modern buildings of various types, damage to load-bearing structures can appear within the first three years of operation. While some defects are not a cause for concern, others may indicate settlement or foundation damage and, as a result, issues with the walls. If problematic cracks are not addressed, foundation damage can quickly reduce the value of your property and lead to unsafe conditions.
When do cracks in walls or foundations indicate a serious problem?Cracks (vertical, horizontal, or diagonal) may point to weak areas in the foundation or subsoil. Additional warning signs include:
- One side of a wall is higher than the other.
- Doors and windows no longer close easily or are misaligned.
- Cracks wider than 1 mm, or those that continue to develop over time.
Problematic cracks typically begin around windows, door openings, or at building corners. However, if you notice small cracks with an opening of less than 1 mm that do not develop over time, they are most likely limited to the finishing layer and are not an immediate concern. Such cracks can usually be planned for repair and easily sealed without affecting the overall structure. In any case, it is important to consult a structural inspection engineer, or preferably a geotechnical engineer, to reliably confirm or rule out deeper underlying causes. These issues tend to develop non-linearly, meaning they may remain unnoticed until reaching a critical point and then progress rapidly.
What causes cracks in walls or foundations? Large cracks can occur when the foundation loses its integrity and strength, causing part or all of the structure to settle. This usually happens because the soil beneath the affected area is insufficiently dense. It is also very important to correctly identify which part of the building is settling, as intuitive assumptions are often misleading. Another key cause of cracking is improper stress distribution within the structure — for example, due to non-compliance with design or construction standards, incorrect placement of expansion joints, or their complete absence. In practice, poorly constructed roofing systems are also a common contributing factor.
How can cracks in walls or foundations be repaired? First, consult a structural engineer (designer) to assess the cause of the crack and recommend a solution, and then contact a Uretek specialist (typically a geotechnical engineer). The most effective long-term solution for repairing major cracks is to lift the structure back to its design position and then reinforce it — essentially restoring the load-bearing nodes of the building. This comprehensive process is referred to as “structural strengthening” and often confuses property owners, as it involves two stages. As the structure is re-leveled, cracks may close or reduce in size; afterward, they are stitched and, if desired, cosmetically finished. Doors and windows also typically return to proper operation.