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How Poor Drainage Causes Concrete Settlement in Spokane
September 2, 20266 min read
Drainage is the single biggest driver of concrete settlement on Spokane properties. Here's exactly how water undermines slabs — and the drainage fixes that protect them.
In Spokane, drainage is the single biggest reason residential concrete settles. Water is patient — it works on the same slab edge for years, and eventually the soil beneath the concrete gives up.
How Water Undermines a Slab
Concrete is strong enough for anything a homeowner asks of it. What fails is what's underneath. When water is concentrated at a slab edge — from a downspout, a bad slope, or an over-watered garden bed — soil erodes and consolidates, leaving a void.
Once a void exists, the slab has nothing to bear against. In Spokane's freeze-thaw climate, the void grows every winter as water freezes and expands, then contracts on thaw. Eventually the concrete settles into the void.
The Drainage Mistakes That Cause Most Failures
- Downspouts discharging directly onto or beside slabs
- Ground sloping toward the house instead of away
- Irrigation spray heads soaking soil next to concrete
- Missing or degraded joint sealants that let water below the slab
- Downspouts routed underground into abandoned drain lines
Detail on each is covered in 7 common drainage mistakes that can lead to concrete settlement.
Drainage Fixes That Protect Concrete
- Extend downspouts 4–6 feet from the foundation
- Grade soil to fall at least 6 inches over the first 10 feet
- Adjust irrigation to avoid direct spray on slab edges
- Reseal control joints every few years
- Verify buried drain lines aren't clogged or broken
The single biggest single fix — extending downspouts — is covered in downspouts and slab settlement.
If your slab is already settled, concrete leveling can restore grade — but the lift only lasts if the drainage cause is corrected too. Request a free on-site inspection and the technician can identify both.
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Lift it — don't replace it.
Have questions about your concrete? Need advice? Want a free estimate? We're here to help. Concrete leveling saves the slab you already have, at a fraction of the cost of replacement.
- Often less costly and less disruptive than tear-out and replacement
- Repair before replacement when appropriate
- Modern concrete lifting methods
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