Basement Waterproofing

Basement waterproofing is arguably the most important renovation investment for New Brunswick homeowners. The Maritime climate delivers heavy rainfall, rapid spring snowmelt, and persistent humidity that puts constant pressure on below-grade walls and floors.

Older homes in Saint John, Moncton, and Fredericton frequently have foundations built from rubble stone or poured concrete with no original waterproofing membrane, making them especially vulnerable to seepage, efflorescence, and chronic dampness. Interior waterproofing solutions include weeping tile systems installed along the basement perimeter, sump pump installation with battery backup, and interior drainage membranes that channel water to the sump before it reaches finished surfaces.

These systems typically cost between $3,000 and $8,000 depending on basement size and severity of the water problem. Exterior waterproofing is more comprehensive and involves excavating around the foundation, applying waterproof coatings or membranes, and installing or replacing exterior drainage tile. This approach addresses the water at its source but requires heavy equipment and typically runs $8,000 to $15,000.

In New Brunswick, where frost depth reaches 4 to 5 feet, exterior excavation must go deep enough to expose the full foundation wall and footing. Crack injection using epoxy or polyurethane is an effective and affordable fix for isolated foundation cracks, usually costing $300 to $800 per crack. Before finishing any NB basement, waterproofing should be the first priority. Moisture problems that go unaddressed will destroy drywall, promote mold growth, and create unhealthy living conditions.

Look for contractors who offer written warranties and carry proper WorkSafeNB coverage for excavation and confined-space work.