Why Slab Foundations Are Common in Montgomery
Most homes built in Montgomery County since the 1970s use slab-on-grade or post-tension slab foundations - they eliminate the crawl space, are cost-effective to build, and work well in Alabama's climate. However, they are directly exposed to the expansive clay soil below, with no air gap to buffer seasonal movement. When clay swells and shrinks, slabs crack, heave, and settle - often in different areas at different rates, creating the differential movement homeowners notice as sloping floors and cracked walls.
Post-Tension Slab Considerations
Post-tension slabs (containing high-strength steel cables tensioned after the concrete cures) require special repair procedures. Drilling into a post-tension slab without locating the cables first can sever them, causing catastrophic and extremely expensive failure. We use cable locating equipment before any drilling or cutting and coordinate with engineers when post-tension work is involved. Do not let any contractor work on your post-tension slab without cable detection.
Slab Repair Methods We Use
Polyurethane foam injection lifts and stabilizes sections of slab that have settled over voids - small holes are drilled through the slab, and expanding foam fills the void and lifts the concrete. Push piers can be installed through the slab to stabilize severely settled sections on larger structures. Crack injection with epoxy or polyurethane seals structural and non-structural cracks. In some cases, partial slab removal and replacement is the most cost-effective option for heavily damaged sections.
Frequently Asked Questions
Do you offer free estimates in Montgomery, AL?
Yes. Montgomery Foundation Repair Co provides free on-site inspections and written estimates throughout Montgomery County - no obligation. Call (334) 835-5928 to schedule.
What causes slab foundations to crack in Montgomery?
Montgomery's expansive red clay swells and shrinks with seasonal moisture changes, creating differential movement under concrete slabs. This causes slabs to crack, settle unevenly, and develop voids underneath. Poor initial compaction and drought conditions accelerate slab movement in Central Alabama.
Can a cracked slab foundation be repaired without replacing it?
Yes - most cracked slabs can be stabilized and repaired without full replacement. Polyurethane foam injection fills voids and lifts settled sections. Steel piers stop ongoing settlement. Montgomery Foundation Repair Co determines the right repair after evaluating crack patterns and settlement measurements.
How do I know if my slab is settling?
Signs of slab settlement include diagonal cracks at door corners, gaps between the floor and baseboards, doors that drag on the floor, uneven tile or wood flooring, and visible cracks in the slab itself. Catching settlement early reduces repair costs significantly.