Slab Leak Water Damage Restoration in Minneapolis

What a slab leak is and isn't

A slab leak is a leak in a pressurized water line that runs under or through a concrete slab. In Minneapolis this is less common than in sunbelt-climate homes because our older housing stock has basements rather than slab-on-grade foundations, and plumbing runs are in the basement overhead rather than under concrete. Where we see slab leaks in Minneapolis: slab-on-grade ranch homes in some suburban developments, garage slab penetrations for hose bibs and in-garage utilities, concrete-slab basement floors with embedded radiant heat lines, and commercial buildings where the main supply runs in a slab trench.

A slab leak is not: a crack in your foundation that's leaking groundwater (that's a waterproofing issue), a sump pump failure during a thaw (that's a hydrostatic pressure issue), or a leak in drain piping below the slab (drain leaks are usually non-pressurized and present differently).

How to tell if you have a slab leak

• A warm spot on a concrete floor (hot-water-side leak)
• Water surfacing through a crack or expansion joint in the slab
• Water appearing at the base of a wall away from any plumbing fixture
• A water bill that climbed significantly with no change in use
• Audible water flow when all fixtures are off
• Pressure drop at interior fixtures
• Foundation-level moisture readings at wall base plates

Our scope — what we do (and what we don't)

We are not plumbers and do not cut concrete, locate pipes under slabs, or re-route pressurized lines. That's a plumbing job that often requires specialized electronic leak-detection equipment to find the exact failure point without excavating the entire slab.

What we do: identify the moisture footprint above and adjacent to the slab leak with thermal imaging and meters, extract any water pooling on the slab, document the full damage scope for the insurance claim, remove and replace affected materials (wall base plates, lower drywall, carpet pad, trim), and run dehumidification until the slab and adjacent framing reach dry-standard moisture content.

Slab drying is slow — set expectations accordingly

Concrete holds water. Drying a saturated slab after a leak is not three to five days — it's often ten to fourteen, sometimes longer, depending on the volume that entered and the slab mass. We measure slab moisture directly with calcium chloride tests or relative humidity probes rather than estimating. Reconstruction on top of a not-yet-dry slab leads to flooring and subfloor failures later, so we wait.

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