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—Renovation and tiling

Cracked pool tiles

A single cracked tile is usually an impact. A crack that runs across several tiles in a line is the structure talking.

A tile can crack from an impact — a dropped object, a heavy item on the steps — or from a defect in the tile itself. Isolated cracks like this can be replaced. When cracks line up across several tiles, especially in a straight or diagonal line, they often follow a crack in the substrate or the shell beneath.

Renovation guides cover work on a pool that already exists: its surface, its waterproofing and sometimes its structure.

Structural cracks need assessment before re-tiling, because new tiles will crack again if the movement continues. Checking for water loss, examining the crack’s pattern and width, and sometimes engaging an engineer helps decide the right repair.

01Summary

What matters most here

  • Single crack

    Usually impact or tile defect.

  • Lines of cracks

    Often follow the substrate.

  • Assess before repair

    So it does not recur.

02Detail

Assessing the crack

  • Pattern

    A single cracked tile points to an impact; cracks that line up across several tiles or spread from a corner point to the layer beneath.

  • Width

    Hairline cracks in the glaze are often cosmetic; cracks wide enough to catch a fingernail deserve a closer look.

  • Location

    Cracks near corners, steps, fittings and the junction of wall and floor are where structural movement tends to show first.

  • Water loss

    Whether the pool loses more than evaporation.

03Before you start

Before calling

  • Photograph the crack

    With a scale reference.

  • Note changes

    Whether it grows.

  • Run a bucket test

    To check water loss.

—In practice

How to use this

Photograph each crack and note whether it affects a single tile or runs as a line across several. Isolated cracks from an impact can be replaced individually. Cracks that line up across tiles should be assessed before any retiling, because the repair has to deal with the crack in the substrate or shell, not just the tiles sitting on top of it.

Mistakes worth avoiding

Replacing tiles over a structural crack
New tiles laid over a crack that is still moving will crack along the very same line within months.
Ignoring a lined-up pattern
Cracks forming a straight or diagonal line are a message from the structure. Have them assessed before choosing a repair.

04FAQ

Common questions about this

Can I replace just one cracked tile?
Yes, if the crack is isolated and the substrate is sound.
Do cracked tiles cause leaks?
Tiles themselves are not the waterproof layer, but cracks may indicate a crack below.
Who assesses structural cracks?
A pool specialist, and where needed a structural engineer.
Will matching tiles be available?
Not always; keeping spares from construction helps.
Should cracked tiles be fixed quickly?
Yes. Cracked tiles can have sharp edges and let water behind the finish, so they are worth replacing once the cause is understood.

05Read next

More pool guides on this

Filed under pool renovation & tile replacement. Every pool guide is listed on the pool guides page.

—NEXT

Seeing cracks?

Send photos of the cracks. We will suggest what to check next.

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