Concrete Crack Injection in Ghana — Structural Repair for Beams, Columns, and Foundations (2026)
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Concrete Crack Injection in Ghana — Structural Repair Guide
Not every crack in concrete needs the same treatment. A hairline crack in a non-load-bearing wall gets a simple surface repair. A 3 mm active crack in a structural beam needs pressure-injection with structural epoxy. Get the diagnosis wrong and you either overspend or leave a serious structural problem unaddressed.
This guide covers concrete crack injection in Ghana: how to identify what type of crack you have, whether it needs injection or surface repair, what materials to use, and when to call a structural engineer.
Types of Concrete Cracks (and How to Identify Them)
1. Plastic Shrinkage Cracks
- Appearance: Short, irregular, random pattern on surface
- Cause: Rapid moisture loss during curing (usually within first 24 hours of pour)
- Depth: Surface only (<10 mm)
- Structural risk: Low
- Fix: Surface sealing with polyurethane sealant or crystalline treatment
2. Drying Shrinkage Cracks
- Appearance: Linear cracks, often at regular intervals
- Cause: Concrete continues to shrink for months as excess moisture leaves
- Depth: Can penetrate slab or wall thickness
- Structural risk: Low to medium
- Fix: Polyurethane injection if wet (leaking), or epoxy injection if dry and structurally continuous
3. Thermal Cracks
- Appearance: Long, straight cracks, often along construction joints
- Cause: Ghana's 20°C daily temperature swing causing differential expansion
- Depth: Full thickness in some cases
- Structural risk: Medium
- Fix: Flexible polyurethane injection (must accommodate ongoing movement)
4. Structural Cracks (Load-Related)
- Appearance: Diagonal cracks in beams, vertical cracks in columns, wider at one end
- Cause: Overloading, settlement, design deficiency
- Depth: Full thickness
- Structural risk: HIGH — requires engineer's assessment
- Fix: Structural epoxy injection AFTER engineer's assessment. May require structural strengthening.
5. Settlement Cracks
- Appearance: Diagonal or stepped cracks, often at building corners
- Cause: Foundation settlement (uneven soil support)
- Depth: Can extend through wall thickness
- Structural risk: HIGH — requires geotechnical + structural assessment
- Fix: Address settlement cause FIRST (may require underpinning), then injection
6. Corrosion Cracks (Concrete Cancer)
- Appearance: Cracks along reinforcement lines, rust staining visible
- Cause: Rebar corrosion causing internal pressure
- Depth: Follows rebar path
- Structural risk: CRITICAL — rebar cross-section reducing over time
- Fix: Remove damaged concrete, treat rebar, apply protective coating, patch with polymer-modified mortar. Injection alone doesn't fix.
When to Inject vs When to Surface Repair
Surface Repair (Sealant / Coating) Is Enough If:
- Crack is less than 0.3 mm wide
- Crack is surface-only (not through full thickness)
- Element is non-structural (partition wall, non-load-bearing panel)
- Crack is dormant (not opening/closing with temperature or load)
- Aesthetic concern only
Injection Required If:
- Crack is 0.3 mm or wider
- Crack penetrates full thickness
- Crack is in a structural element (beam, column, slab, foundation)
- Water is leaking through the crack
- Crack is active (opens/closes with load or temperature)
- Structural integrity restoration required
Injection Materials — Epoxy vs Polyurethane
Structural Epoxy Injection
- Use for: Dry, dormant cracks in structural elements where you need to restore load transfer
- Properties: High compressive strength (matches or exceeds concrete), rigid, permanent
- Cure time: 24–72 hours
- Cost per linear metre: GHS 150–300 (materials + labour)
- Not suitable for: Wet cracks, active/moving cracks, cosmetic-only issues
Polyurethane Injection
- Use for: Wet cracks (actively leaking), active cracks that continue to move
- Properties: Expands on contact with water (waterstop), flexible, permanent seal
- Cure time: 15 minutes to 6 hours depending on product
- Cost per linear metre: GHS 200–400 (materials + labour)
- Not suitable for: Structural strength restoration (doesn't transfer loads like epoxy)
Cementitious Injection
- Use for: Large-volume voids, honeycomb concrete, non-critical repairs
- Properties: Rigid, cheaper than resin systems, similar to substrate
- Cost per linear metre: GHS 80–150
- Not suitable for: Fine cracks (below 3 mm), active cracks
The Injection Application Process
- Crack assessment — measure width, depth, activity (moving or dormant), moisture presence
- Engineer's approval — for structural elements, get structural engineer's method statement
- Surface preparation — clean crack, remove loose material, dry substrate
- Port installation — install injection ports along crack length (typically 200–300 mm spacing)
- Crack surface seal — seal crack surface between ports with epoxy paste to contain injected material
- Injection — pressure-inject material from bottom port upward until material appears at next port; move up
- Curing — allow material to cure per manufacturer's specification
- Port removal & final finishing — remove ports, seal port holes, grind surface flush
- Testing — water test (for waterstop applications) or core sample (for structural verification)
When You MUST Call a Structural Engineer
- Cracks in structural beams or columns
- Diagonal cracks in walls (potential shear failure)
- Cracks with visible displacement (one side higher than the other)
- Cracks growing wider over time (measured at 1-month intervals)
- Multiple cracks in same area (indicating systemic issue)
- Cracks accompanied by concrete spalling or rust staining
- Foundation cracks with any visible movement
- Cracks in buildings 5+ storeys (potential progressive failure risk)
Ghana has qualified structural engineers registered with the Ghana Institution of Engineers. Never inject a structural crack without their written approval.
Common Locations for Crack Injection in Ghanaian Buildings
Basements & Below-Grade Walls
Groundwater ingress through wall cracks is the #1 basement waterproofing issue. Polyurethane injection stops active leaks. Combine with negative-side coating for permanent solution. Reference: Basement Waterproofing Guide.
Water Tanks
Concrete water tanks develop cracks from thermal cycling and shrinkage. Injection with potable-water-approved polyurethane restores water-tightness. See: Water Tank Crack Repair.
Swimming Pools
Pool cracks lose water and damage tile finishes. Polyurethane injection specifically formulated for continuous water contact. See: Swimming Pool Crack Repair.
Retaining Walls
Retaining walls in Accra's hilly areas (Legon, Tantra, East Legon) commonly develop cracks under earth pressure. Structural assessment required first — injection alone may mask a design deficiency.
Slab-to-Wall Junctions
Movement at slab-to-wall interfaces creates recurring cracks. Flexible polyurethane injection combined with movement-joint installation is the permanent solution.
Cost Estimation
Cost per typical Ghanaian project:
- Small crack repair (up to 2 metres): GHS 800–2,500
- Medium repair (2–10 metres): GHS 2,500–8,000
- Basement wall waterproofing with multiple cracks: GHS 8,000–25,000
- Water tank refurbishment (full crack survey + injection): GHS 5,000–15,000
- Swimming pool crack repair: GHS 3,000–12,000
- Large structural project (multi-storey): quoted individually
Frequently Asked Questions
Can I inject cracks myself?
Not recommended. Injection requires specialist equipment (injection pumps, pressure regulators), proper material selection, and expertise in placement. DIY often makes cracks worse by improperly filling them. Call Fest Ghana Limited for professional injection.
Will injection last forever?
Epoxy injection is permanent (matches concrete lifespan). Polyurethane injection lasts 15–25 years and can be re-injected if needed. Cementitious injection lasts 10–15 years.
How do I know if the injection worked?
Water leak stopped = obvious success. For structural repair, core sample analysis or non-destructive testing (impact-echo, ultrasonic) can verify. Most contracts include water-tightness testing.
What if the crack comes back?
New cracks in the same area suggest ongoing structural movement. Original injection may not have been suitable. Get structural engineer's re-assessment before further injection.
Ready for a Crack Injection Assessment?
Fest Ghana Limited provides crack injection services across Ghana. We work with structural engineers on load-bearing elements and independently on waterproofing repairs. Free site assessment.
👉 Book Free Site Assessment · Call/WhatsApp: 0555 548 001