What is the cost of foundation waterproofing in New Brunswick?

Foundation waterproofing in New Brunswick costs $5,000–$15,000 per exterior wall for a full exterior excavation and membrane system, or $5,000–$15,000 for a full interior perimeter drainage system with sump pump. Smaller crack injection repairs run $500–$1,500 per crack for targeted fixes.

The right approach depends entirely on the type and severity of the water problem — and that diagnosis should come from a professional inspection, not a guess. The three main approaches are:

Exterior waterproofing involves excavating the soil away from the foundation wall down to the footing, cleaning the wall, applying a waterproofing membrane (spray-applied rubberized asphalt or dimple mat system), installing new weeping tile in gravel at the footing, and backfilling. This is the most permanent solution because it stops water at the source before it ever reaches the wall. Cost is higher because of excavation — a typical Saint John or Fredericton home requires a significant excavation in a tight backyard space. Expect $5,000–$15,000 per wall affected, more for larger homes or difficult access.

Interior drainage systems channel water that enters through the wall or floor to a collection point rather than stopping it from entering. A perimeter drain channel is cut into the basement floor around the perimeter, a sump pit is installed, and a sump pump ejects the water away from the house. Cost is typically $5,000–$15,000 for a full basement perimeter. Interior systems are less disruptive than exterior excavation and are the right choice when exterior access is impractical (finished landscaping, decks, attached garages).

Crack injection is appropriate for a single or few isolated cracks causing leaks in an otherwise dry basement. Polyurethane injection ($500–$1,500 per crack) expands and seals active leaks effectively.

In NB, the timing of water infiltration gives clues about the cause. Water that appears during spring thaw suggests weeping tile failure or high water table. Water that appears only during heavy rain suggests surface drainage problems. Both require different solutions. Never commit to an expensive repair without understanding the cause first. New Brunswick Concrete can connect you with foundation specialists in your area through the New Brunswick Construction Network.