Concrete Crack Fix – Practical Ways to Stop Cracks Growing
If you’ve spotted a crack in your concrete floor, patio, or foundation, it’s easy to feel worried. The good news is most cracks can be tackled without calling a specialist. With the right tools and a clear plan, you can seal the gap, restore strength, and avoid costly damage.
What Causes Concrete Cracks?
Before you start fixing, know why the crack appeared. Common reasons in UK homes include shrinkage as the concrete dries, movement from soil settlement, and water freeze‑thaw cycles. Small hairline cracks are usually harmless, but wider gaps (over 5 mm) may point to structural stress.
Step‑by‑Step Concrete Crack Fix
1. Assess the crack size. Use a ruler or a crack gauge. If it’s less than 3 mm, a simple filler works. Anything wider needs a deeper repair and possibly a structural engineer’s opinion.
2. Clean the crack. Remove loose concrete, dust, and debris with a wire brush or a vacuum. A clean surface ensures good adhesion for the repair material.
3. Choose the right product. For shallow cracks, a polymer‑based concrete sealant works well. For deeper cracks, use a two‑part epoxy or hydraulic cement. Both expand slightly as they set, sealing the gap tightly.
4. Prepare the material. Follow the manufacturer’s instructions. Mix epoxy or cement to a smooth, lump‑free paste. If you’re using a caulk‑type sealant, load it into a caulking gun.
5. Apply the filler. For epoxy, push the paste into the crack with a putty knife, making sure it fills the bottom. For sealant, squeeze it gently, then smooth it with a finger or a tool. Avoid air pockets.
6. Smooth and finish. Use a trowel or a damp sponge to level the surface with surrounding concrete. This step helps the repaired area blend in and reduces future moisture trapping.
7. Let it cure. Most products need 24‑48 hours to reach full strength. Keep the area dry and protect it from traffic until curing is complete.
8. Check your work. After curing, run a water hose over the area. If water runs off without seeping, the fix is solid. If you notice new cracks, it could signal a deeper settlement issue.
While DIY fixes are handy, remember that some cracks hide bigger problems. If you see repeated cracking, large gaps, or movement in walls, contact a structural engineer. Early professional advice can save you from expensive foundation repairs later.
Tools you’ll need: safety glasses, gloves, wire brush, vacuum, putty knife, mixing bucket, trowel, and the chosen repair material. Most of these are available at local DIY stores or online retailers.
Cost‑wise, a DIY concrete crack fix usually runs between £20 and £80, depending on the product and size of the job. Professional repairs can start at £200 and climb quickly for larger structural work.
Finally, keep your concrete healthy by managing moisture. Good drainage, sealing exposed surfaces, and regular inspections are simple ways to prevent new cracks from forming.
With these steps, you can confidently tackle most concrete cracks around your home, keep the structure sound, and avoid a pricey call‑out. Happy fixing!
