Block Paving That Has Lost Its Colour: What Restores It and What Does Not

Lift one block from an edge or a spot that is normally covered, a plant pot is ideal, and compare the top face with the sides that have never been exposed. If the top is close in colour to the protected faces, the drive is dirty. If the top is noticeably paler right through the surface, the pigment has genuinely weathered.

Real fading is caused by ultraviolet light acting on the pigment in the top few millimetres of the block, and by that surface layer slowly wearing under traffic. It is gradual, it is most obvious on strongly coloured blocks such as brindle and red, and it takes many years.

Grime, by contrast, builds within a season or two, is heavier in shaded and low traffic areas, and comes off. That is why the wheel tracks on a dirty drive often look brighter than the untrafficked strip next to them.

For a homeowner tackling this, work in this order. Kill the organic growth first with a moss and algae treatment and leave it the full stated time. Then wash, then re-sand. Doing it in any other order wastes effort.

When pressure washing, keep the nozzle at a consistent height and angle and work in overlapping passes across whole blocks, not block by block, or you will see the striping later. Accept that washing removes jointing sand, and that a drive left unsanded loses interlock and starts to move.

Re-sand once the paving has dried out properly. Kiln dried sand brushed in and vibrated down is the traditional approach and is cheap. A polymeric jointing compound costs more but resists washout and weed growth considerably better, which on a drive that gets cleaned every year or two is usually money well spent.

A sealer does not restore lost pigment, but it does change how the surface reflects light, so a clean, sealed drive looks richer and darker in the same way a stone looks better wet. Colour enhancing sealers push this further.

The conditions matter more than the product. Paving must be clean, fully dry and re-sanded before sealing, and it needs settled weather. Seal over damp paving or over active efflorescence and you lock the problem in under a film that then has to be stripped.

Sealing is not permanent. Expect to redo it every few years, and understand that once you start sealing a drive you are committing to maintaining it that way.

If blocks are genuinely worn through the pigmented surface, chipped along the arrises or spalling after frost damage, no amount of cleaning changes that. Nor will cleaning fix a drive that has sunk, spread at the edges or lost its falls.

In that situation the choices are replacing the worst blocks with the closest current match, turning blocks over where the underside is sound and uniform, or relaying with new paving. We are happy to say when a good clean and re-sand is all a drive needs, because a drive we do not need to replace this year is a customer who calls us when they do. New driveway work we carry out is covered by our ten year guarantee.