Experts in Concrete Patio installation

How to Fix Surface Pitting and Rough Spots on Concrete Patios

Noticed small craters, chips, or uneven patches forming on your patio surface? You’re not alone. Surface pitting is a common issue on concrete patios in the UK, especially after harsh winters or years of exposure.

In this article, we cover what causes pitting and rough textures on outdoor concrete and how to smooth, repair, and protect your patio so it looks fresh and feels safe underfoot.

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What Causes Surface Pitting in Concrete Patios?

Concrete pitting is when small, shallow holes form on the surface of the slab. These pits can grow over time and lead to uneven textures or tripping hazards. Here are the most common causes of pitting on UK patios.

Freeze–Thaw Cycles

In cold weather, water enters the surface of your patio and then freezes. As it expands, it breaks off tiny pieces of the concrete surface. Repeated freeze–thaw cycles cause this damage to worsen, resulting in shallow pits and erosion. Patios in exposed UK gardens are especially at risk during wet winters.

Poor Surface Finishing

If the patio was finished too quickly or with excess water during installation, the surface becomes weak and porous. This weaker top layer is more likely to chip, wear down, or pit, particularly if heavy furniture is dragged across it or garden tools are dropped on it over time.

De-Icing Salts and Harsh Cleaners

Some winter de-icers contain chemicals that attack concrete. When used regularly, they can corrode the surface and accelerate pitting. Strong acid-based cleaners can have a similar effect. Always choose cleaning and de-icing products marked safe for use on concrete surfaces.

Age and Wear

Even high-quality concrete patios start to show wear after years of use. Foot traffic, weather exposure, and minor impact damage all contribute to the surface gradually roughening or developing pits. The older the slab, the more likely surface treatments will be needed to restore smoothness.

Lack of Sealant or Maintenance

A concrete sealer acts as a protective layer. Without it, water and debris can settle into the surface and cause gradual erosion. If your patio hasn’t been sealed in a while, or ever, it’s more vulnerable to both pitting and staining.

How to Repair and Smooth a Pitted Patio Surface

Clean and Prepare the Area

Remove all loose material with a stiff brush or pressure washer.
Use a concrete cleaner to lift stains and dirt, and let the surface dry completely.
For larger pits, use a grinder or chisel to open the edges for better bonding.

Apply a Concrete Patching Compound

Use a concrete resurfacer or patching mix formulated for shallow repairs.
Fill each pit with a trowel, feathering the edges into the surrounding surface.
Let the patch cure as instructed, and protect from rain during the process.

Seal and Maintain the Surface

Apply a concrete sealer once repairs are fully cured to protect against water and frost.
Use a non-slip finish if the patio is in a high-footfall area.
Reseal every 2–3 years to prevent future roughness or wear.

Frequently Asked Questions

No, pitting is usually a surface-level cosmetic issue. However, if left unchecked, it can lead to larger cracks or water damage. Early repair keeps the patio looking good and functioning safely.

Yes, many small pits can be repaired using a DIY resurfacer or patch kit. Be sure to clean and prep the surface properly, and choose a product rated for outdoor use on concrete.

Yes, sealing helps prevent water from entering the surface, which is a major cause of pitting. Regular resealing is one of the best ways to protect your patio from weather-related damage.

Early pitting is often due to poor surface finishing, overwatering during installation, or failure to cure the concrete properly. It can also occur if harsh cleaners or salt are used too soon after installation.

Yes, we offer expert repair and resurfacing services for all types of patio wear, including pitting. Our team can assess the damage and recommend the best fix to restore both appearance and durability.