Concrete Services
Void under slab
Water washouts and shifting soil leave dangerous empty pockets beneath your concrete. We inject lightweight polyurethane foam to completely expand, pack, and seal these voids before the heavy slab cracks or caves in.
What causes dangerous voids under concrete?
Concrete slabs are incredibly heavy but surprisingly rigid. They require 100% continuous soil contact to stay stable. When underground water patterns or shifting dirt layers leave empty pockets of air beneath them, the concrete is forced to bridge the gap alone until it inevitably fails.
Pouring heavy concrete or mud slurry into these holes adds massive weight, which compresses the soil further and worsens the problem. Our advanced PolyLevel® system injects a lightweight expanding polymer that fills every microscopic pocket and stabilizes the subgrade permanently.
Heavy roof runoff, broken downspouts, or underground plumbing leaks sweep loose soil away from beneath the slab, carving out large empty spaces.
If the soil foundation was poorly prepared or loosely packed during the home's construction, gravity naturally compresses the earth over time, creating an underground gap.
Small animals, moles, and insects frequently dig tunnels directly under warm concrete patios and driveways, accelerating soil displacement and undermining the structure.
Your symptom matched
These issues often share the same root cause — inspect them together
or call 1-833-584-1049
What it looks like
Uneven concrete slabs
Self-diagnosis guide
A hollow space under concrete is an invisible hazard. Detecting it early prevents your slabs from snapping in half under heavy vehicle or foot traffic.
Can wait a few weeks
Call us now
FAQs
Sagging floors frequently asked questions
Find answers about our services and process
We install a perimeter drain system and a direct drainage channel that directs any water coming through the crack into your sump pump. Finally, we backfill the crack with stone and cover it with fresh concrete to prevent future leaks.
Still have questions?
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your concrete slabs?
Free professional diagnostic inspection · High-density foam cures in 15 minutes · Same-week booking available