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• Staining around the joint
• Deteriorated or missing sealant
• Cracking beside the joint
• Peeling coatings
• Persistent dampness
• Concrete spalling
• Rust staining
• Recurring leaks after previous repairs

A joint that repeatedly leaks after surface sealing may require a more detailed assessment of the joint and surrounding structure.

• Damaged protective coatings
• Efflorescence
• Persistent dampness
• Mould growth
• Deterioration of adjacent joints
• Damage around nearby services
• Recurring maintenance issues

Repairing the source of water ingress can help reduce ongoing moisture exposure.

• Whether adjacent cracking is involved
• The condition of existing sealants
• Whether surrounding concrete has deteriorated
• Whether hydrostatic pressure is contributing
• Whether previous repairs have failed
• Which repair method is appropriate

This helps avoid repeatedly treating the visible symptom without addressing the underlying issue.

Can a leaking construction joint be repaired from inside?

In some situations, yes. Certain leaking joints in basement walls, underground car parks and other concrete structures can be treated from the accessible side using injection or other internal waterproofing methods.

However, this depends on the joint construction, water pressure, movement, surrounding concrete and existing waterproofing system. Not every leaking joint can be effectively treated from one side.

How can construction joint problems be prevented?

Regular inspection and maintenance can help identify joint deterioration before it becomes a more significant water ingress problem.

Useful measures include:

• Inspecting exposed construction joints
• Monitoring damp areas
• Checking joint sealants for deterioration
• Repairing cracks around joints
• Maintaining drainage systems
• Addressing water pooling
• Investigating recurring leaks
• Monitoring underground structures for groundwater ingress
• Recording previous joint repairs
• Inspecting areas after significant water exposure
• Construction joint repair across NSW and ACT

United Trade provides construction joint repair services across Sydney, Canberra / ACT, the Central Coast, Newcastle, Wollongong and the Blue Mountains.

Construction joint repairs can be considered for residential properties, commercial buildings, strata buildings, underground car parks and industrial structures, depending on the condition and requirements of the affected area.