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• A strong bonded repair is required
• The crack needs to be sealed below the surface
• The surrounding structure does not show signs of ongoing movement

Epoxy injection may not be the appropriate solution for every crack. Cracks that continue to move, are caused by settlement, or are associated with significant structural deterioration may require a different repair approach.

A professional assessment is therefore important before selecting an injection system.

Epoxy injection vs PU injection

Epoxy and polyurethane injection systems are both used in concrete remedial work, but they serve different purposes.

Epoxy injection is commonly selected when the repair requires a strong bonded seal in a suitable, stable crack.

PU injection is often used where water ingress is the primary concern and a flexible or moisture-reactive resin is more appropriate.

The choice between the two depends on factors such as the condition of the concrete, crack movement, moisture levels, water pressure and the intended outcome of the repair.

In some situations, another concrete repair or waterproofing method may be more suitable than either injection system.

Signs your concrete may need crack repair

Not every concrete crack requires injection, but cracks should be investigated when they are recurring, widening or associated with other signs of deterioration.

Look for:

• Cracks that are becoming wider
• Cracks that extend through concrete elements
• Recurring cracks after previous repairs
• Water entering through a concrete crack
• Dampness around cracked areas
• Cracking around joints or structural elements
• Spalling or deterioration around the crack
• Cracks accompanied by movement or settlement
• Cracks appearing in basements or underground structures

If you notice significant or recurring cracking, obtaining a professional assessment can help determine the appropriate repair strategy.

Epoxy crack injection for commercial, residential and strata properties

Cracking can affect properties of all types, but the consequences can vary depending on how the building is used.

In a residential property, cracks may occur in slabs, walls, foundations or other concrete elements and should be assessed when they persist or worsen.

For strata buildings, concrete cracking can affect common areas, basement structures, car parks and other shared building elements. Identifying the cause and scope of the issue is particularly important when repairs involve multiple areas of a property.

In commercial and industrial buildings, concrete repairs may need to be planned around access requirements, building operations and the use of the affected area.

United Trade provides remedial concrete and waterproofing services for these different property environments, with solutions selected according to the condition and requirements of each site.