CrackRepairs
A small crack today is a big problem tomorrow. Fix it before water gets in.
Get Free QuotesWhy Cracks Are a Serious Problem
- Cracks in walls and roofs let water straight in.
- Water causes rust in steel reinforcing inside concrete - weakening the structure.
- Moisture in cracks freezes in winter and makes cracks grow bigger.
- Small hairline cracks can become large structural cracks over time.
- Cracks are also a sign of movement or settlement in the building.
- If left, crack repairs become much more expensive and complicated.
- Sealing cracks early is cheap - fixing the damage they cause is not.
Types of Crack Repairs
Wall Crack Sealing
- •Hairline cracks (very thin) are filled with flexible acrylic or silicone sealant.
- •Larger cracks are cut open slightly (raked out), cleaned, and filled with mortar or epoxy.
- •Cracks near windows, doors, and corners are very common - these need careful sealing.
- •Flexible sealants are used in areas that move - like expansion joints.
- •Rigid epoxy is used where the crack needs to be bonded back together strongly.
- •After sealing, a waterproof coating is applied over the top.
- •Internal cracks also need attention - especially in wet areas like bathrooms.
Roof Crack Repairs
- •Cracks in roof slabs (flat roofs) are a very common cause of leaks.
- •Expansion and contraction from heat causes cracks to form over time.
- •Cracks are filled with a polyurethane or bitumen-based sealant.
- •The area around the crack is prepared carefully - cleaned and dried.
- •A reinforcing mesh is sometimes placed over the crack before coating.
- •The whole roof then gets a waterproof coating after repairs.
- •Roof crack repairs must be done by experienced professionals.
Types of Cracks - What They Mean
- Hairline cracks - very thin, usually cosmetic, fill quickly.
- Horizontal cracks in walls - serious, may indicate structural movement.
- Vertical cracks - often from settlement, usually not structural.
- Diagonal cracks from corners of windows - common, caused by movement.
- Step cracks in brick work - following the mortar joints, often from settlement.
- Wide cracks (over 5mm) - always need professional assessment.
How Much Do Crack Repairs Cost?
- Simple hairline crack sealing: R300 – R800 per crack.
- Larger wall cracks: R500 – R3,000 per crack.
- Roof crack repairs: R1,500 – R8,000 depending on size and number.
- Structural crack repairs (serious damage): R5,000 – R30,000+.
- Price depends on crack size, depth, location, and access.
- Always get multiple quotes - especially for serious cracks.
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