The short answer
Why Dry Soil Leads to Cracks
Dry summer weather can make the soil around your foundation lose moisture and shrink. As the soil pulls away, it creates voids under and beside the concrete. Your foundation then has uneven support, so some areas may settle more than others. That differential movement is what often causes new cracks or widens existing ones.
The effect is more pronounced in clay-rich soils, which expand when wet and contract when dry. In areas with a mild marine climate, the ground can cycle between very wet and very dry. If your home sits on such soil, you might notice hairline cracks appearing in late summer or early fall.
How to Spot Foundation Cracks
Check your foundation walls and the interior walls directly above them. Look for vertical cracks that are wider at the top or bottom, or horizontal cracks that run along the mortar lines of block foundations. Also inspect the corners of doors and windows for signs of shifting, such as sticking or gaps around the frames.
Cracks from dry soil are usually narrow, often less than a quarter inch, but they can be a sign of ongoing movement. If you see a crack that is getting wider over time, or if water seeps through it during the rainy season, you should have a professional assess it. Early attention can prevent more serious structural issues.
- Check for cracks in the foundation walls, especially near corners.
- Look for interior wall cracks that mirror the foundation cracks.
- Inspect doors and windows for sticking or gaps that indicate shifting.
- Note if cracks are wider than a quarter inch or growing over time.
- Watch for water stains or dampness near cracks after rain.
What You Can Do to Prevent Cracks
Managing the moisture around your foundation can reduce the risk of cracking. During dry spells, water the soil around the foundation evenly, especially if you have clay soil. Soaker hoses or drip irrigation can help maintain consistent moisture. Keep the soil graded so it slopes away from the house, which prevents water from pooling near the foundation.
Also, keep tree roots away from the foundation, as large trees can draw significant moisture from the soil. If you have downspouts, extend them so they discharge water well away from the foundation. These steps help keep the soil stable, reducing the chance of differential settlement and the cracks that come with it.
When to Call in the Pros
If you notice a crack that is more than a hairline, or if you see signs of structural movement like sticking doors or uneven floors, it is time to consult a professional. A water damage inspection can determine if the crack is just cosmetic or a sign of a larger issue. The pros can also check for water intrusion that might worsen the problem.
For cracks caused by dry soil, foundation stabilization may be needed to address the underlying settlement. The pros can evaluate the soil conditions and recommend solutions, such as underpinning or soil moisture management. They can also help with waterproofing to prevent future water damage. Acting early is key to avoiding more extensive repairs.
- A water damage inspection can identify the cause and extent of cracks.
- Foundation stabilization may be needed if settlement is ongoing.
- Foundation waterproofing can prevent water from entering through cracks.
- Structural drying and dehumidification may be necessary if moisture is present.
- Leak detection can rule out plumbing issues that might be causing movement.
What to Expect During Repairs
When the pros address foundation cracks, the work usually involves cleaning out the crack, filling it with a suitable sealant or epoxy, and possibly reinforcing the area. If the cause is soil settlement, they might install piers or grout to stabilize the foundation. The exact method depends on the soil type and the severity of the crack.
The cost of such repairs varies widely, often ranging from a few hundred to several thousand dollars, depending on the extent of the damage and the accessibility of the foundation. Factors like the size of the crack, the type of foundation, and the need for excavation all influence the final price. A professional assessment will give you a clearer picture.
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Call Now (425) 407-5186Frequently asked questions
Are all foundation cracks a sign of a serious problem?
No, many hairline cracks are cosmetic and result from normal settling or seasonal soil movement. However, if a crack is wider than a quarter inch, is growing, or is accompanied by sticking doors or uneven floors, it could indicate a structural issue that needs professional evaluation.
Can I fix foundation cracks myself?
You can fill small, non-structural cracks with a concrete patching compound, but it is important to determine the cause first. If the crack is due to ongoing settlement or water damage, a DIY fix may not last. For any crack that is structural or growing, consult a professional to avoid making it worse.
How long does foundation repair take?
The duration depends on the method used and the extent of the damage. Simple crack filling might take a day, while stabilization work can take several days or weeks. The pros will assess the situation and give you a realistic timeline. Acting quickly is the right move to prevent further damage.