High Water Table Basement, Northside

The situation

Sitting on the lake plain, this basement took water from below rather than through the walls, driven by the water table (opens in a new tab) rather than rainfall. It was arriving through the slab and cove joint continuously from February onward, not just during storms.

What we did

Full-perimeter below-slab waterproofing installed in January while the ground outside was frozen solid, one of the reasons interior work matters here. Bedded in washed stone, wrapped in filter fabric, with clean-outs at all four corners.

The outcome

The basement stayed dry through the thaw that began six weeks later. Moisture readings taken in May came back at 45-49% relative humidity (opens in a new tab) against 71% before the work.

Water arriving along a line rather than at a point is hydrostatic pressure (opens in a new tab) , and no amount of crack repair would have touched it. The 2026 cost article explains where full-perimeter pricing comes from, and our process explains how we confirm the diagnosis first.

By the numbers

Metric	Result
Linear feet treated	112 ft
Installed in	January
Humidity before / after	71% to 45-49%
Warranty	Lifetime transferable