Oed Projects - Pty Ltd

Solutions

1. Shrinkage Cracks (plaster, concrete, mortar)
• Proper curing during and after construction.
• Apply crack filler putty or polymer modified mortar.
• For hairline cracks, use wall putty repainting.

2. Thermal Cracks (due to expansion/contraction)
• Provide expansion joints in long walls/slabs.
• Use materials with low thermal movement.
• Fill cracks with elastomeric sealants (flexible materials that expand/contract).

3. Crazing Cracks (fine hairline, network pattern)
• Usually surface-level, no structural danger.
• Improve curing methods to avoid rapid drying.
• Apply a thin coat of plaster or skim coat paint.

4. Map Cracking (surface cracks in plaster/concrete)
• Remove loose plaster and re-plaster with proper mix.
• Ensure correct water–cement ratio.
• Use sulfate-resistant cement in areas prone to chemical attack.

5. Settlement Cracks (minor, not structural)
• Fill with epoxy putty, crack filler, or cement mortar.
• If soil settlement is minor, monitor for further movement before repair.

6. Moisture/Leakage-Induced Cracks
• Seal cracks with waterproofing compounds.
• Apply polymer-modified mortar or PU injection for waterproofing.
• Ensure proper drainage and damp-proofing to prevent recurrence.

7. General Hairline Cracks (paint-level cracks)
• Fill with acrylic crack filler or wall putty.
• Sand smooth, then repaint with flexible paint.

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