Broken Expansion Joint and Edge Repair on Outdoor Concrete
A broken expansion joint can be repaired without touching the rest of the slab: the damaged material and loose edges are cleaned out, the joint and its borders are restored, and the surface is recoloured in two coats. The aim is to keep the joint working as a joint, not to fill it solid and push the cracking somewhere else.
Send us a photo and the m²What does a broken expansion joint look like?
A broken expansion joint is a gap between concrete sections that has lost its filler, crumbled at the edges or filled up with soil and weeds. On a driveway you often see the corners of the slabs either side chipped away, leaving a ragged channel instead of a neat line.
On imprinted concrete, the joints can be hard to spot because they are cut along the pattern. They usually show up as a line of cracking or chipping that follows the stamped design.
- Joint filler missing, perished or pulled out.
- Chipped or broken slab edges along the joint.
- Weeds and soil growing in the gap.
- Water pooling at the joint or running underneath.
- Cracks starting from the end of a joint.
Why do joints and edges matter so much?
Concrete expands and contracts with heat, and on a sunny coast it does so every day. Joints give that movement a planned place to happen, so the slab does not crack at random.
When a joint fails, water and roots get underneath, the edges break up under traffic, and new cracks can appear nearby. Edges along walls, steps and planters suffer in a similar way, because they are where the slab is thinnest and least supported.
Our guide to expansion joints and edges explains how joints work and why a well-meant solid fill can make things worse.
How do we repair a broken expansion joint?
As with all our repairs, the whole surface is pressure cleaned first, which also flushes soil and plant matter out of the joints. Broken and loose concrete along the joint edges is then removed back to sound material.
The joint edges are rebuilt where they have chipped away, and the joint itself is restored with a material intended for movement joints, as described in its product data sheet. Once all the joints, cracks and edges are done, borders are cut in by brush and the whole area is recoloured in two coats of synthetic resin paint.
Which edges and borders do we repair?
We repair the edges where outdoor concrete meets other things: walls, pergola posts, steps, kerbs, planters, gates, drains and pool copings. These are the spots where chips and cracks collect, and where a roller cannot reach when recolouring.
On the Marbella imprinted driveway in our work page, the borders along the walls and the pergola posts were cut in by brush before the main surface was coloured. That is what keeps the line crisp in the finished photos.
When is a joint problem a sign of movement?
A joint that keeps opening wider, slabs that have dropped or tilted at a joint, or a step between neighbouring sections all point to movement in the ground or base. Repairing the joint will not stop that.
Our article on warning signs before repairing concrete lists what to look for, and concrete crack repair explains how we deal with cracks that start at a joint.
What happens to the joints when the surface is recoloured?
The joints are treated as part of the design, not painted shut. After the joint repair, the coating is applied so that the joint lines stay visible and able to do their job.
On imprinted concrete, this matters for looks as well as function. A crisp, even joint line following the pattern makes the finished surface look deliberate, while a joint smeared over with colour tends to crack along an untidy line later.
If you are unsure where your joints are, mark them on a photo or ask us to point them out when we reply to your enquiry.
Can joint repair be combined with other repairs?
It nearly always is. Joint damage tends to come with cracked corners, small breakouts and flaking edges, and it makes sense to handle them in the same visit before the colour goes on.
Small holes beside joints are covered on our pothole repair page, and crumbling edges on spalling concrete repair. If your surface is stamped, see imprinted concrete repair.
Can you arrange joint repairs while you are not in Spain?
Yes. Joint and edge damage photographs well, so a property manager, cleaner or neighbour can take the pictures we need. Send them with the rough square metres by email or WhatsApp, in English.
We tell you whether the joints look like a surface repair or a movement issue, quote the work and arrange access with whoever holds your keys.
What affects the cost of repairing joints and edges?
The total length of joints and edges to rebuild, how badly they are broken, the area to recolour and how complicated the borders are all affect the price. A simple rectangular drive is quicker to cut in than a terrace full of planters, steps and posts.
The guide price per square metre and its inclusions are on the quote and price page. Send photos for a quote on your own surface.
Frequently asked questions
What is an expansion joint in a driveway?
It is a deliberate gap or cut between concrete sections that lets the slab expand and contract with temperature without cracking at random. On imprinted concrete these joints are often cut along the pattern, so they can be hard to see until they start to break down.
Can a broken expansion joint be repaired without replacing the slab?
Yes, in most cases. If the slabs either side are level and stable, we clean out the joint, rebuild the broken edges and restore the joint with a suitable material, then recolour the surface. If the slabs have shifted, the movement needs looking at first.
Should I fill an expansion joint with concrete or mortar?
Filling a movement joint solid takes away its purpose. The slab still needs to move, so it will usually crack somewhere else instead. Joints should be restored with material intended for movement joints, which is how we approach the repair.
Why are weeds growing in my driveway joints?
Weeds grow where joint filler has perished or washed out, leaving a gap that fills with soil and seeds. The roots then widen the gap and let water underneath. Cleaning out the joints and restoring them is part of our joint repair.
Do you repair the edges of driveways next to walls?
Yes. Edges along walls, posts, steps, planters and gates are where concrete chips and cracks most, and they are also the hardest parts to recolour neatly. We rebuild damaged edges and cut in the borders by brush before the main surface is coloured.
My slabs are uneven at the joint. Can you fix that?
No. A height difference at a joint means one section has moved, usually because of the ground or base underneath. That needs a qualified engineer to assess. Surface repair and recolouring only make sense once the cause has been dealt with.
Can you repair joints in imprinted concrete?
Yes. Joints in stamped concrete can be cleaned out, their edges rebuilt and the surface recoloured. Because they often follow the lines of the pattern, the restored joints tend to blend into the design once the whole area has an even new colour, rather than standing out as separate repairs.
Do you repair joints between paving slabs or block paving?
Our repair service focuses on concrete and imprinted concrete. Block paving and slab joints are a different job, and their cleaning and colour work is covered elsewhere in our network. Send photos and we will tell you whether your surface is something we repair.
How long does joint repair material last?
Durability depends on the product, the joint and the conditions, so we do not give a figure. The product data sheet for the material used sets out its expected performance, and we can share it with you before the work (to be verified per product).
Do you repair joints in community garages and ramps?
We repair joints and edges on existing outdoor concrete, which can include shared driveways and external ramps. The request usually needs to come through the community administrator. We do not mark out parking lines or work on indoor industrial floors.
What photos help you quote for joint and edge repair?
Photos along the length of the damaged joints, close-ups of broken edges with something for scale, and a wide view of the whole surface. Point out any place where one slab sits higher than another, and give the approximate area in square metres.
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