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Sealants & Tile Systems / Site problem guide

Tile grout cracks or washes out

Grout erodes in wet joints or cracks along edges.

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?

Grout erodes in wet joints or cracks along edges.

02 / Inspect and test

Evidence to collect

Check movement, joint width, chemical cleaning, cure and water entry behind tile.

03 / Likely mechanism

Why it can fail

Rigid grout at movement joints or incompatible grout can fail repeatedly.

04 / Technical response

Choose the system

Restore movement joints with suitable sealant and use grout matched to exposure elsewhere.

05 / Site execution

Control the application

Clean joints fully, mix to prescribed ratio and protect curing grout.

06 / Acceptance

Verify the result

Inspect after service cycles and confirm no concealed leak persists.

Avoid this shortcut

Grout replacement is not a waterproofing repair if the substrate membrane failed.

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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