Serious Foundation Cracks: What They Mean and How to Deal With Them
Foundations don’t crack on purpose. When you see a wide, jagged or growing crack, it’s a warning sign that the house’s base is under stress. Ignoring it can lead to sagging floors, warped walls, and expensive fixes later on.
First, check the crack’s width. Anything over 1/8 inch (about 3 mm) is worth a closer look, especially if it’s horizontal or stepped. Vertical cracks are common, but if they’re wide and run up the wall, they could signal settlement problems.
How to Test If a Crack Is Serious
Grab a ruler or a cheap tape measure and record the crack’s size at two points a few weeks apart. If it’s growing, even a tiny amount, that’s a red flag. Also, look for moisture stains, bulging walls, or doors that stick – these often accompany serious foundation movement.
Another quick test is the “hairline crack” check. Lightly tap the crack with a screwdriver; if it feels soft or the material crumbles, the concrete may be deteriorating, which is a bigger problem than a simple shrinkage crack.
What to Do Next
When you suspect a serious issue, call a qualified foundation specialist. They’ll do a thorough survey, possibly using laser levels or a soil test, to pinpoint the cause – be it poor soil, water damage, or structural overload.
Repair options vary. For small but active cracks, epoxy injection or polyurethane foam can seal and stabilize the gap. Larger gaps often need steel piers or push‑piers driven deep into stable soil to lift the slab back into place.
Cost-wise, simple epoxy fixes start around £300‑£500, while full pier systems can run £5,000‑£15,000 depending on the size of your home and the severity of the movement. Getting several quotes helps you compare methods and ensure you’re not overpaying.
While you wait for a professional, keep the ground around the foundation dry. Fix any drainage problems, clear gutters, and avoid over‑watering the garden. Less water means less pressure on the soil that supports your foundation.
In short, serious foundation cracks don’t go away on their own. Spot them early, measure them, and bring in an expert before they turn into costly structural damage. Your home’s safety and value depend on it.
