Sealing block paving after cleaning: is it worth it?

Sealing block paving after cleaning is worth it for many driveways and patios, because it stabilises the joint sand, helps resist oil and dirt stains, slows weed and moss growth, and can enhance the colour. The catch is the preparation: the paving must be properly cleaned, re-sanded and completely dry before sealing, or you trap dirt and moisture in. Done right, on suitable paving, sealing makes a drive easier to maintain, but it does need redoing every few years.

What sealing actually does

A block paving sealer soaks into and coats the surface, doing several jobs at once:

• Stabilises joint sand: it binds the kiln-dried sand in the joints, reducing weed growth and sand loss.
• Resists stains: oil, grease and dirt sit on the surface rather than soaking in, making spills easier to clean.
• Slows weeds and moss: by sealing the joints and surface, there is less for them to root in.
• Enhances appearance: many sealers deepen the colour and can add a subtle sheen.

Why preparation is everything

Sealing only works on properly prepared paving. The blocks must be thoroughly cleaned (ideally pressure washed), the joints re-sanded with kiln-dried sand, and the whole area completely dry, usually a few dry days after cleaning. Sealing over dirt, moss or damp paving traps the problem in and can cause a hazy, patchy finish. This is why sealing follows our cleaning and re-sanding process, not the other way round.

When to seal

The best time is after a thorough clean and re-sand, during a spell of dry, mild weather, so the paving can dry fully and the sealer can cure. Spring and summer are ideal in the UK. Newly laid paving usually needs to weather for a while (often a few months) before its first seal, check the manufacturer's guidance.

What to expect afterwards

Sealed paving is easier to keep clean, spills wipe up more easily, and sand and weeds are reduced, but it is not maintenance-free or permanent. You will still need to sweep and occasionally wash it, and the sealer typically needs reapplying every two to five years depending on the product and traffic. Sealers come in matt and sheen finishes, so you can choose the look you prefer.

Is it worth it for you?

Sealing is most worthwhile on driveways prone to oil stains and weeds, and on paving you have just invested in cleaning and re-sanding and want to keep looking good. For a lightly used patio you are happy to sweep occasionally, it is optional. The cost buys easier maintenance and a longer-lasting clean finish.

Let us clean, re-sand and advise on sealing

Our driveway and patio cleaning service pressure washes and re-sands block paving across Derby and Derbyshire, the essential prep for a good seal, and we can advise whether sealing is worthwhile for your surface and how to get the best, longest-lasting result.