If you’ve ever walked around your garden and noticed a hairline crack in the slab, you’re not alone. Foundation cracks are one of the most common worries for anyone owning a house in the UK. The good news is you don’t need an engineering degree to tell if a crack is harmless or a red flag. This guide will walk you through the basics, so you can decide when to call a pro and when a DIY check‑up will do.
First, grab a ruler or a simple crack‑width gauge. Measure the gap at the widest spot – if it’s under 0.3 mm (about the thickness of a credit card), most experts call it a normal settlement crack. Anything wider than 0.5 mm, especially if it’s growing, deserves a closer look. Look for patterns: vertical cracks that run the full height of a wall often point to foundation movement, while horizontal cracks may indicate pressure from soil.
Next, check the location. Cracks near doors, windows, or load‑bearing walls are more concerning because they affect structural integrity. Also, keep an eye on recurring cracks after a heavy rain or a cold snap – moisture changes can exacerbate shifting soils.
When you’ve identified a crack that could be serious, the next step is to decide how to fix it. For small, non‑structural cracks, epoxy fillers or flexible sealants work well and keep water out. For wider or load‑bearing cracks, you’ll need a structural solution like carbon fibre reinforcement, underpinning, or hydraulic cement repairs.
Before you pick a method, get a cost estimate. Simple epoxy jobs may run a few hundred pounds, while underpinning can climb into the thousands. Always compare at least two quotes and ask each contractor to explain why they recommend a particular technique.
Don’t forget insurance. Many home insurance policies in the UK exclude foundation damage caused by subsidence or poor ground conditions. Review your policy to see what’s covered and consider a separate subsidence endorsement if you live in a high‑risk area.
One more practical tip: keep a log of any cracks you notice, with dates and measurements. This record helps a structural engineer see if the problem is worsening and can also be useful when negotiating a sale or insurance claim.
In summary, spotting a foundation issue starts with a simple measurement and a look at where the crack appears. If it’s wider than a credit‑card thickness, growing, or near a load‑bearing area, get a professional opinion. Choose repair methods based on the crack’s severity and budget, and always double‑check your insurance coverage.
Got more questions about your home’s foundation? Our tag page gathers all the latest articles on crack sizing, repair risks, insurance tips, and choosing the right cement. Dive in, learn the facts, and protect your biggest investment with confidence.
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