31/07/2026
From the image alone, it appears to be a major structural crack, not just a plaster or shrinkage crack. The crack runs diagonally from the upper part of the wall to the lower part and continues across several blockwork panels, which is a strong indication of structural movement.
Possible causes include:
Differential foundation settlement (most likely).
Inadequate or failed foundation design.
Weak or poorly compacted soil.
Absence or poor detailing of reinforced concrete columns, ring beams, or lintels.
Overloading or poor construction workmanship.
Best solution
1. Stop all construction work immediately. Continuing construction could make the damage worse or lead to collapse.
2. Engage a structural engineer. The building needs a detailed structural assessment before any repair is attempted.
3. Investigate the foundation. Check:
Soil bearing capacity.
Foundation depth and width.
Evidence of settlement or water erosion.
4. Monitor the crack. Install crack gauges or use tell-tales to determine whether the crack is still widening.
5. Repair depends on the cause:
If movement has stopped and the structure is sound: stitch the crack with reinforcement bars or helical bars and inject epoxy or grout where appropriate, then rebuild damaged masonry.
If foundation settlement is ongoing: underpin or strengthen the foundation before repairing the wall.
If structural members (columns or beams) are inadequate: strengthen or reconstruct them as designed by the structural engineer.
If the wall has lost structural integrity, demolish and rebuild the affected section after correcting the underlying problem.
What should NOT be done
Do not simply fill the crack with cement mortar or plaster. This only hides the symptom and does not solve the structural problem.
Do not continue adding more floors or roof loads until the cause has been identified and corrected.
As a Quantity Surveyor, if you were advising a client, the recommendation would be:
> "Suspend construction immediately and commission a structural integrity assessment. Repairs should only commence after the root cause—particularly foundation settlement or structural inadequacy—has been identified and corrected. Cosmetic repairs alone are unsafe and unacceptable."
Based on the image, this crack is serious enough that partial demolition and reconstruction may be more economical and safer than attempting repairs, but that decision should only be made after an on-site structural investigation.
What is the solution to this type of crack?
