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Waterproofing / Site problem guide

Expansion joint leakage

Water enters through a joint that opens and closes with temperature or movement.

A practical decision sequence

Diagnose the cause, then verify the repair.

Use the site evidence to agree a project-specific method with the responsible engineer, concrete producer, manufacturer or specialist applicator.

01 / Symptom

What is happening?

Water enters through a joint that opens and closes with temperature or movement.

02 / Inspect and test

Evidence to collect

Measure joint width range; inspect waterbar, sealant adhesion, backing and cover protection.

03 / Likely mechanism

Why it can fail

A rigid bridge or incorrectly dimensioned sealant cannot accommodate movement.

04 / Technical response

Choose the system

Use an engineered movement joint system suited to displacement and water exposure.

05 / Site execution

Control the application

Prepare bond faces, use correct backing and primer, and protect the assembly from traffic.

06 / Acceptance

Verify the result

Inspect geometry and adhesion, then verify watertightness under the project test.

Avoid this shortcut

Do not grout a designed movement joint solid.

These guides are editorial starting points, not a project specification. Confirm the design, product data, substrate conditions and inspection plan for the actual site.
Technical references

References inform the topic; they do not endorse a specific product for this project.

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