Foundation Fix: Easy Ways to Repair Cracks and Keep Your Home Stable
Noticed a crack in your foundation? It can feel scary, but most cracks are fixable with the right steps. This guide walks you through measuring the crack, deciding if it’s a DIY job, and picking the best repair material, so you can act fast and avoid bigger problems.
How to Spot a Serious Crack
First, grab a ruler or a tape measure. A crack under 0.3mm (about a hair’s width) is usually harmless – it’s just normal settling. Anything wider than 0.5mm deserves a closer look. Look for horizontal cracks, stair‑step patterns, or cracks that keep growing each time it rains. Those signs often mean the soil around the foundation is moving and the structure needs help.
If you see water seeping through the crack, that’s a red flag. Moisture can weaken concrete and bring mold into the crawl space. In that case, stop and call a structural engineer. They’ll tell you if the foundation needs underpinning, wall anchors, or a more extensive fix.
DIY Fixes for Small to Medium Cracks
For cracks under 5mm that aren’t moving, you can usually repair them yourself. Here’s a quick checklist:
- Clean the crack: Use a wire brush and a vacuum to remove dust, loose concrete, and any debris. A clean surface helps the new material stick.
- Choose the right cement: Hydraulic cement is the top pick for foundation work. It expands as it sets, sealing gaps tightly and resisting water.
- Mix and apply: Follow the bag instructions – usually a 1:2 water‑to‑cement ratio. Fill the crack with a trowel, press the mix deep, and smooth the surface.
- Seal the area: After the cement cures (usually 24‑48 hours), spray a waterproof sealant. This adds a protective layer against future moisture.
Be sure to wear gloves and safety glasses while you work. Even a simple fix can last years if you follow the steps carefully.
When to Call the Professionals
While many cracks are DIY‑friendly, some need expert hands. Call a foundation specialist if:
- The crack is wider than 5mm or keeps growing.
- You see large gaps at the bottom of walls or around the slab.
- The house is sinking or tilting noticeably.
- Your insurance company asks for a certified inspection.
Maintaining a Strong Foundation
After you fix the crack, keep an eye on the area for at least a year. Small movements can happen as the ground settles again. Clear gutters and downspouts so water flows away from the base of the house. A simple French drain or grading the soil away from the walls can stop water from pooling under the slab.
Regularly check for new cracks, especially after heavy rain or winter freeze‑thaw cycles. Early detection means cheaper repairs and less stress.
Fixing foundation cracks doesn’t have to be a nightmare. With the right tools, a bit of know‑how, and a quick call to a professional when needed, you can keep your home safe and solid for years to come.
