CONCRETE
CRACK REPAIRS
SYDNEY

Concrete can crack because of drying shrinkage, thermal effects, loading, movement, settlement, corrosion or construction-related factors. The pattern, width, location and surrounding conditions help establish which factors may be involved.

The cause and rate of movement should be assessed first. Some cracks need monitoring before a repair is selected; others need prompt investigation or measures to manage the affected area. The next step depends on the individual structure and its condition.

Water-bearing cracks may be treated with a suitable polyurethane injection system or another waterproofing approach. The crack path, movement, water source and site conditions determine the repair scope.

Cracks can allow water and contaminants to reach reinforcing steel. Where corrosion develops, expansion can cause further cracking, delamination and spalling. Repairs may need to address both the crack and the surrounding deteriorated concrete.

Timeframes depend on access, the number and extent of cracks, preparation, repair method, curing and whether the work must be staged around occupants or operations.

Site observations and a quotation are different from a formal structural engineering report. If structural design, assessment or certification is required, the necessary engineering input is discussed as part of the project scope.

Appearance alone does not establish structural significance. Location, loading, displacement and changes over time must be considered. Where structural concerns exist, appropriately qualified engineering assessment may be needed before selecting a repair.

Epoxy injection introduces a suitable resin into a crack to bond the sides and restore continuity where the repair design requires it. It is generally considered for stable cracks, with moisture conditions and material suitability checked before work.

Crack stitching installs reinforcement across a crack to help transfer load and stabilise a specified repair. Bar type, anchorage, spacing and bonding system depend on the substrate, structural requirements and repair design.

Not every crack needs the same treatment. An assessment helps establish whether monitoring, sealing, structural repair or no immediate intervention is appropriate.

Suitable cracks may be repaired with injection, stitching, sealing or local patch repairs. More extensive deterioration can require removal and reinstatement of damaged concrete.

Use the inspection form on this page or call 0424 408 330. Include the property location, photographs, a description of the cracking and any reports or plans. Tell us if the crack is changing or allowing water through.