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Specification guide

Cracks, Settlement and Structural Problems Explained

Which cracks are cosmetic and which are a warning — how to read settlement, damp, and structural movement in a Ghanaian building, and when to call an expert.

Not Every Crack Is a Crisis — But Some Are

A crack appears in a wall and the worry starts. The honest position is in between the two extremes: most cracks are cosmetic and harmless, a minority are a genuine warning, and the difference is readable if you know what to look for. The danger is treating a warning crack as cosmetic — or spending on a cosmetic crack as if it were structural.

This guide explains how to read what a building is telling you. Ghana Expert Builders diagnoses, repairs, and strengthens to a craft standard — master builders since 1972. Request a consultation or BoQ: +233 27 011 3728.

How to Read a Crack

The character of a crack tells you most of what you need to know.

Usually Cosmetic

  • Fine hairline cracks in plaster, often from plaster shrinkage or normal curing.
  • Cracks that are stable — not widening over weeks or months.
  • Cracks following the line of a plaster joint or a change in material, where finishes meet.

Worth a Closer Look

  • Cracks wider than a few millimetres.
  • Diagonal or stepped cracks following the mortar joints of blockwork — often a settlement signature.
  • Cracks that are active — measurably widening over time.
  • Cracks around openings (doors, windows) running into the structure.
  • Cracks that pass through structural elements rather than sitting in the finish.

A simple discipline: mark the ends of a crack and date it. If it grows, it is telling you something is still moving — and that is when you call someone who builds.

Settlement — What It Is and When It Matters

All buildings settle a little as loads come onto the ground. That uniform, early settlement is normal. The problem is differential settlement — when one part of a building moves relative to another, usually because the ground under it varies or the foundation was under-built for the conditions.

Differential settlement is what produces stepped, diagonal cracking, doors and windows that bind, and floors that fall out of level. Common Ghanaian causes include foundations placed on made-up or expansive ground, poor drainage letting water move soil under the foundation, and foundations sized for less than the building actually does. This is genuinely structural, and it is assessed with engineering input (GhIE), not guessed.

Damp and Cracking Together

Moisture and cracking often travel together in Ghana’s climate. Rising damp, leaking wet areas, and rainwater finding its way in can soften ground, corrode reinforcement, and worsen cracking. When concrete reinforcement corrodes it expands and spalls the concrete off — exposed, rusting steel over an area is a structural warning, not a cosmetic one. A proper diagnosis looks at damp and cracking together rather than treating them as separate cosmetic jobs.

When to Call an Expert

Call for a proper assessment when you see any of these:

  • Cracks wider than a few millimetres, or stepped diagonal cracks in blockwork.
  • Cracks that are actively widening.
  • Doors or windows binding, or floors going out of level.
  • Exposed, corroding reinforcement in concrete.
  • Cracking that appears alongside persistent damp.

These are not jobs for filler and paint. Filling a structural crack hides the symptom while the cause keeps working.

How a Structural Problem Is Properly Fixed

  1. Diagnose the cause — assess the building, with engineering input where the structure is in question, to find why it is moving, not just where.
  2. Stabilise — address the cause: the ground, the drainage, the foundation, or the load path.
  3. Repair and strengthen — fix the structure properly, which can mean underpinning, strengthening, or rebuilding an element.
  4. Make good and protect — restore finishes and protect against the damp or movement that caused it, with the work measured in a Bill of Quantities so you budget against a real figure.

All built to Ghana’s building regulations (L.I. 1630) and the Ghana Building Code (GS 1207:2018), with EPA permitting (L.I. 1652) where the work requires it.

Frequently Asked Questions

Are cracks in my walls dangerous?

Most are cosmetic — fine, stable hairline cracks in plaster. The ones worth investigating are wider cracks, stepped diagonal cracks following blockwork joints, cracks that are actively widening, and cracks around openings that run into the structure. The honest test is an assessment.

What does settlement look like in a building?

Normal settlement is uniform and early. The problem is differential settlement — one part moving relative to another — which shows as stepped diagonal cracking, doors and windows binding, and floors out of level. It is assessed with engineering input.

Can I just fill and paint over a crack?

Only if it is genuinely cosmetic and stable. Filling a structural crack hides the symptom while the cause keeps working — so the crack returns and the underlying problem worsens. Diagnose the cause first.

Why is the concrete cracking with rusty steel showing?

That is corroding reinforcement expanding and spalling the concrete — a structural warning, usually linked to moisture getting into the concrete. It needs proper diagnosis and repair, not cosmetic patching.

Request a consultation or BoQ: +233 27 011 3728.