Found a line in your patio, driveway or garden wall? Most people think a crack means big trouble, but often it’s something you can sort yourself. The key is to know what you’re looking at, pick the right material and follow a few simple steps. Below you’ll get a straight‑forward plan that works for typical UK concrete cracks.
First, check the width and length. A hair‑thin line (less than 1 mm) usually comes from drying shrinkage and isn’t structural. Anything wider than 3 mm could be movement, settlement or water damage. Use a ruler or a simple gauge – you can even press a piece of cardboard against the crack and see the impression.
Next, look at where it appears. Cracks near footings, along load‑bearing walls or at the edge of a slab often signal a deeper issue. If you see multiple cracks spreading out from the same point, that’s a red flag. In those cases, it’s wise to call a structural engineer before you start filling anything.
For narrow, non‑structural cracks, a concrete filler works fine. Grab a quick‑setting polymer‑modified cement – the kind we recommend in our "Best Cement for Foundation Repair" article. Mix according to the bag, push it into the crack with a trowel, and smooth the surface. The polymer helps the repair bond even when the concrete moves a little.
If the crack is wider (3‑10 mm) or you need extra strength, use a two‑part epoxy resin. Clean the crack thoroughly, inject the resin with the supplied dispenser, and let it cure. Epoxy creates a strong, waterproof seal that can handle some movement.
For very large or deep cracks, you might need a concrete patch or even a replacement slab section. Cut out the damaged area with a masonry saw, clean the edges, and pour a fresh batch of concrete using a mix designed for high tensile strength. Remember to use a screed and finish it level with the surrounding surface.
Don’t forget the basics: always prep the surface, remove loose bits, dampen the area before applying any product, and follow the manufacturer's drying times. Skipping these steps often leads to the repair failing quickly.
When you’re done, keep an eye on the repair for a few weeks. If the crack re‑opens or new cracks appear, you may have an underlying movement issue that needs professional attention.
That’s it – spot, choose, fix, and monitor. With the right product and a bit of patience, most concrete cracks can be handled without a full‑blown contractor bill. If you ever feel unsure, the safety route is to get a structural engineer’s opinion – it could save you money and headaches later.
Foundations can crack over time, causing stress for homeowners. Understanding the best repair methods is crucial for maintaining structural integrity. From polyurethane injections to carbon fiber patches, each technique addresses different crack types. This article delves into effective solutions, offering practical tips for choosing the right approach.
Read More
