Flaking or chipping concrete

What homeowners may be seeing

Common notes from the ground include:

• thin flakes coming away from the top of a slab or path
• small pits or rough patches that catch the foot
• edges that look crumbled or “eaten”
• a coating or sealer lifting with the surface underneath
• exposed aggregate where a smoother finish used to sit

This is different from a stain you can wash. It is also different from a slab that has moved as a whole. If the surface has risen, dropped or tilted, see uneven outdoor surfaces.

What “spalling” means

You may hear this called spalling. In plain terms, it is when the surface of concrete breaks, flakes or chips away. People also say scaling, pitting or “the top is coming off”.

The word helps when you talk with a concreter or inspector. You do not need it to describe what you can see.

Possible contributing factors

At a high level, the surface can break down when moisture, age, wear, previous coatings, impact or the original finish work against each other. Site conditions matter. A slab that stays wet, takes vehicle traffic, or sits next to a garden bed may age differently from a dry, sheltered path.

Possible considerations include:

• age and how the concrete was finished
• water sitting on or under the surface
• wear from vehicles, bins or furniture
• previous sealers or coatings that are peeling
• existing cracks, repairs or thin toppings

None of those can be confirmed from a description or a photograph in this guide. VVPS does not diagnose structural condition from text or images.

What homeowners may want to consider

• Is the change only visual, or are pieces coming away underfoot?
• Has the surface been sealed, painted or previously repaired?
• Does water pond, or do nearby downpipes empty onto the slab?
• Are there trip edges, hollow sounds, or rust marks?
• Has anything heavy or sharp impacted the area?

This page does not provide patching, grinding, or structural repair instructions. Those are skilled jobs. The wrong repair can hide a deeper problem or make the surface worse.

Aggressive cleaning on a weak or already failing surface can remove more material. Method should follow the condition of the concrete, not a standard pressure setting. See surface types and appropriate cleaning methods.

When professional assessment may be appropriate

A qualified concreter, builder or engineer may be the right conversation when:

• pieces keep coming away
• steel appears to be showing
• the slab sounds hollow or has moved
• you are considering a large repair or replacement

VVPS can discuss driveway cleaning, pressure washing or concrete sealing only where the surface is suitable. Cleaning and sealing do not rebuild damaged concrete. If the useful next step is assessment rather than washing, we will say so.

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