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Yes or No: Can You Lay Tarmac Over Concrete?
If your concrete driveway is cracked, stained, or simply looking tired, you may be wondering if you can just cover it with tarmac instead of starting over. It sounds simple enough and can seem like a quick way to save money.
But is it actually possible to lay tarmac over concrete? And more importantly, will it last?
At MAM Contracting, we often get this question from homeowners and property managers. The answer depends on the condition of your existing surface and how well it’s prepared before any work begins.
In this blog, we’ll explain when it can be done, when it shouldn’t be done, and how to get it right if you decide to go ahead.
The short answer
Yes, you can lay tarmac over concrete, but only if the concrete base is stable, clean, and properly prepared.
If the existing surface is cracked, crumbling, or has poor drainage, covering it with tarmac can lead to bigger problems later. Uneven or weak areas underneath will cause the new layer to shift or crack, shortening the life of your driveway.
A solid, well-prepared concrete base, on the other hand, can support a durable tarmac surface that looks fresh and lasts for years.
Factors to consider before laying tarmac over concrete
Not every concrete surface is a good base for tarmacking. Before any work starts, these points should be checked carefully to avoid costly issues later.
1. Surface condition
Inspect the entire area for cracks, soft spots, or uneven patches. If the concrete is damaged, those imperfections will transfer through the new layer, leaving visible marks or weak areas. Repairing cracks, filling gaps, and ensuring the surface is clean and level helps the tarmac bond properly and prevents early failure.
2. Drainage
Concrete doesn’t allow water to pass through, which means drainage must be managed correctly. Poor run-off causes standing water that can weaken the tarmac over time, leading to cracks or potholes.
A contractor may recommend creating drainage channels, installing soakaways, or adjusting the slope of the surface to ensure water flows away efficiently.
3. Structural strength
Tarmac relies on the base beneath it for support. If the concrete slab is unstable or shifting, the tarmac will move with it and start to break apart. It’s crucial to confirm that the sub-base is compact and firm. Any signs of movement or hollow areas need to be addressed before resurfacing.
4. Height and levels
Adding a new tarmac layer increases the overall height of the driveway. This might cause issues at garage doors, thresholds, or drainage grates.
A professional installer will check these measurements to make sure the finished surface doesn’t interfere with entry points or water flow. In some cases, it might be necessary to mill down sections of the existing concrete to maintain the right levels.
Benefits of laying tarmac over concrete
If your concrete is in good condition, resurfacing it with tarmac can be a practical and efficient solution.
- Quicker installation – You can skip the demolition and removal stage, which means less mess and a faster turnaround.
- Cost savings – By avoiding excavation and disposal fees, you can save significantly on labour and material costs.
- Improved appearance – Fresh tarmac instantly enhances kerb appeal, giving the surface a clean and uniform look that hides minor flaws in the old concrete.
- Durability – With the right preparation, bonding coat, and drainage, tarmac can provide a long-lasting surface that performs well under daily use.
- Less disruption – Because the existing base is reused, installation causes minimal disturbance to surrounding areas, making it ideal for driveways in busy homes or commercial sites.
Risks and drawbacks
While laying tarmac over concrete can work, it’s not always the best option. The quality of the final result depends entirely on the condition of the existing surface.
If the concrete is weak or cracked, those problems will reappear through the new layer. Water trapped between the two materials can also cause soft spots or lifting. Without good drainage and adhesion, the surface will wear out faster than one installed from the ground up.
Even a well-laid surface can suffer if the base starts to shift, leading to cracks and uneven sections. That’s why a professional inspection is essential before starting any work. It helps identify structural weaknesses and ensures the surface is suitable for resurfacing rather than full replacement.
Best practices for tarmacking over concrete
If you decide to go ahead, proper preparation is what makes the difference between a short-term fix and a lasting surface.
- Inspect and repair first – Fill cracks, remove loose concrete, and clean away oil or debris. This prevents future movement and improves bonding.
- Apply a bonding agent or tack coat – This layer helps the tarmac adhere firmly to the concrete, reducing the risk of separation or peeling.
- Plan for drainage – Install suitable drainage solutions or ensure the surface has a slight slope to prevent standing water.
- Hire experienced professionals – Skilled contractors understand how to prepare concrete bases correctly, apply bonding layers, and check levels. Their experience ensures the finished surface is strong, safe, and durable.
With the right preparation and expert installation, tarmacking over concrete can provide a solid, good-looking surface that lasts for years.
Save or spend? The real answer to tarmacking over concrete
It’s tempting to think you can save time and money by laying tarmac straight over an old concrete driveway. On the surface, it sounds practical: no digging, no disposal costs, and a fresh new finish in just a few days.
But here’s the catch... not every concrete surface is fit for a new layer of tarmac. Without the right preparation, that quick fix can lead to cracks, drainage issues, and repairs that end up costing more in the long run.
At MAM Contracting, we’ve helped homeowners, developers, and businesses across Scotland and the North of England achieve long-lasting results through expert groundwork and tarmac installation. Our team can inspect your current driveway, advise on the best approach, and deliver a surface that’s both durable and great-looking.
If you’re considering resurfacing or starting fresh, we’re here to help.
FAQs
Can I tarmac over a concrete driveway?
Yes, as long as the concrete is stable, well-drained, and in good condition. Any damage must be repaired before installation.
What preparation is needed before tarmacking over concrete?
Clean the surface, repair cracks, and apply a tack coat to help the new layer bond securely.
Will tarmacking over concrete affect the surface’s durability?
If done correctly, the driveway can last for years. However, if the concrete moves or has drainage issues, the tarmac may fail early.