What “structural” means
A structural crack may indicate that forces, deformation or capacity are affecting the performance of a load-carrying element. Non-structural cracks may relate to shrinkage, temperature, finishes or local restraint, but can still permit water and reduce durability.
The exact response should be defined from verified site conditions, relevant design information and the performance objective. Where evidence is incomplete, further investigation is safer than assuming the visible symptom tells the whole story.
What to document
Record crack location, orientation, width, pattern, depth where known, moisture, time history and nearby loads or alterations. Photographs with scale and repeat observations are more useful than isolated impressions.
The exact response should be defined from verified site conditions, relevant design information and the performance objective. Where evidence is incomplete, further investigation is safer than assuming the visible symptom tells the whole story.
Movement matters
A stable crack and an active crack may require different materials and details. Monitoring can help distinguish seasonal or ongoing movement from a dormant condition.
The exact response should be defined from verified site conditions, relevant design information and the performance objective. Where evidence is incomplete, further investigation is safer than assuming the visible symptom tells the whole story.
When to escalate
Urgent professional review is appropriate where cracks are rapidly changing, accompanied by deflection, crushing, instability, impact, fire damage, falling concrete or other signs of distress.
The exact response should be defined from verified site conditions, relevant design information and the performance objective. Where evidence is incomplete, further investigation is safer than assuming the visible symptom tells the whole story.
Repair follows diagnosis
Injection, routing and sealing, flexible joint treatment, concrete repair or strengthening should be selected only after the cause and objective are understood.
The exact response should be defined from verified site conditions, relevant design information and the performance objective. Where evidence is incomplete, further investigation is safer than assuming the visible symptom tells the whole story.
Frequently asked questions
A crack cannot be classified reliably from width or appearance alone. Structural significance depends on cause, location, movement, load path, geometry, history and the condition of the surrounding element.
Yes. General guidance cannot determine the cause, capacity, material compatibility or safe repair scope for a specific structure.