Slab Foundation Repair in Huntsville, AL
The problem is happening silently — beneath a slab you can't see, in soil that's been moving with every wet and dry season. By the time tile starts cracking or doors stop closing, it's been building for years. We find out what's happening and fix it. We're Huntsville Foundation Pros — locally based, no subcontractors.
What's Happening Under Your Home
Most homeowners only see the symptoms — uneven floors, cracked tile, sticking doors. Here's the process that produces those symptoms, step by step.
Wet season arrives
Clay soil beneath the slab absorbs moisture and expands. This lifts sections of concrete slightly and creates uneven pressure across the slab surface.
Dry season follows
The clay contracts as moisture leaves. It pulls away from the underside of the slab, leaving gaps and voids where there used to be solid soil contact.
The void grows
Each wet-dry cycle makes the void slightly larger. Over years, the concrete above loses support across an expanding area.
The slab drops
Without support, the unsupported section of slab settles downward. This shows up as uneven floors, tile cracking, door misalignment, and gaps at the baseboards.
The North Alabama factor: Huntsville's clay-heavy Tennessee Valley soil makes this cycle more severe than in many other regions. The clay swells and contracts more dramatically than sandy or rocky soil, accelerating void formation beneath slabs. Settling slabs also frequently cause foundation cracks to appear in interior drywall and exterior brick as sections of concrete shift.
Signs Your Slab May Be Settling
These symptoms appear gradually — which is why they're easy to overlook until the problem is bigger.
- Floors that feel noticeably unlevel when walking through the home
- Ceramic tile or grout cracking without any impact or obvious cause
- Gaps forming between the floor and the baseboards or walls
- Doors that drag along the floor or fail to latch properly
- Diagonal cracks in drywall, especially above door frames
- Visible cracks in the concrete slab itself
- Water pooling near the foundation after rain
How We Fix Settled Slabs
The right repair depends on how much the slab has settled and what's causing it. We recommend based on what we find — not what's easiest for us.
Polyurethane Foam Lifting
Best for: Moderate settlement with accessible voids
Small holes are drilled through the slab. High-density polyurethane foam is injected under pressure, filling the void and lifting the slab back toward level. Holes are patched. Most jobs done in a single day.
- Minimal disruption
- No major excavation
- Completed in one day
- Long-lasting when root cause is addressed
Helical Pier Underpinning
Best for: Significant settlement requiring permanent structural support
Steel piers are hydraulically driven through the slab to load-bearing soil far below the zone of clay movement. The slab load is transferred to the piers permanently. See our helical piers page for full details.
- Addresses root cause
- Permanent solution
- Backed by transferable warranty
- Can lift foundation back toward original elevation
Wondering what this will cost? See our Huntsville foundation repair cost guide →
Slab Repair Questions
How much does slab foundation repair cost in Huntsville?
Polyurethane slab lifting for a small settled area typically runs $1,500–$4,000. Pier installation for more significant settlement is more involved — costs commonly range from $10,000–$25,000 depending on the number of piers and site conditions. We provide a free on-site inspection and written estimate before anything starts.
What causes concrete slabs to settle in North Alabama?
The clay-heavy soil throughout the Huntsville area is the main culprit. Clay expands when wet and contracts when dry, and years of that seasonal movement can erode the contact between the soil and the slab — leaving voids that cause sections to drop. Plumbing leaks beneath the slab can also wash out soil and accelerate settling.
Is slab lifting a permanent fix?
Polyurethane lifting is long-lasting when the cause is addressed, but if the underlying soil conditions continue to change, future movement is possible. Pier installation goes deeper and transfers the load to soil that doesn't move with moisture — that's the more permanent solution for significant settlement.
Can I stay in my home during slab repair?
Usually yes. Polyurethane injection is minimally invasive — small holes are drilled, foam is injected, and the holes are patched. Most jobs are done in a single day. Pier installation requires more access and may mean moving furniture in the affected area, but doesn't typically require vacating the home.
Concerned About Your Slab?
We'll come out, take measurements, and tell you honestly what we're seeing — free of charge, no obligation.
Free inspection · No pressure · Serving Huntsville and North Alabama
Get Your Free Foundation Inspection
Tell us what's going on. A foundation specialist will call you back within one business day to schedule your free on-site inspection.