Basement Waterproofing

Water always takes the easiest path

Every wet basement in Nova Scotia comes down to the same physics. Rain and snowmelt saturate the soil around your foundation. Saturated soil holds water against the wall, and that water pushes: roughly 60 pounds per square foot at eight feet of depth. That pressure is called hydrostatic pressure, and it does not need a large opening to get through. A hairline crack, a porous mortar joint, a tie rod hole, or the cold joint where your slab meets your wall is more than enough.

Our climate makes it worse than most. The freeze-thaw cycle across an Atlantic winter runs dozens of times a season, and each cycle widens whatever opening already exists. Clay-heavy till soils across much of the mainland drain slowly, so water sits against the foundation instead of moving away from it. On the Cape Breton coalfield the ground does the opposite and still costs you: porous sandstone keeps feeding water to the wall for days after the rain has stopped. Post-tropical storms drop more rain in six hours than the ground can absorb in two days.

None of that is unusual, and none of it is unfixable.

The three ways water gets in

Through the wall. Cracks, honeycombing in the pour, deteriorated parging on block, or the holes left by form ties. This is the most common source and often the cheapest to fix.

Through the floor–wall joint. The cold joint where the slab was poured against the footing is not a bond, it is a seam. When the water table rises, water comes up through it. You will see it as a wet line around the perimeter of the floor rather than a stain running down a wall.

Up through the slab. When the water table rises above the underside of your floor, water pushes up through the concrete itself. Efflorescence, that chalky white residue, is the giveaway.

Each of these has a different fix. A contractor who recommends the same system to every homeowner is selling a product, not diagnosing a problem.

What we install

Interior systems

An interior perimeter drainage system is the workhorse of basement waterproofing. We cut a channel in the slab along the inside of the footing, lay perforated pipe in clean washed stone, run a dimple board up the wall to direct wall seepage down into the pipe, and slope everything to a sealed sump basin. A quality pump with a check valve and a battery backup carries the water out and away from the house. Concrete goes back over top.

The result is that water is no longer fighting your foundation. It is being collected and removed before it can reach your floor.

Exterior systems

Exterior waterproofing is the more complete solution because it stops water before it ever contacts the concrete. We excavate to the footing, clean and repair the wall, apply a waterproofing membrane (not the spray-on damp-proofing that builders use, which is a moisture retarder rather than a waterproofer), install a dimple drainage board, lay new weeping tile in filter-fabric-wrapped stone at the footing, and backfill with free-draining material graded away from the house.

It costs more and it disturbs your yard. When access allows and the budget is there, it is the strongest thing you can do for a foundation.

Targeted repairs

Not every basement needs a full system. A single active crack in an otherwise sound poured wall is a two-hour polyurethane injection. A crawl space with a dirt floor needs encapsulation, not drainage. Downspouts discharging two feet from the foundation need extending before anyone excavates anything. We will always tell you when the small fix is the right fix.