Foundation waterproofing, interior and exterior drains


There is water infiltration and moisture in the basement.

Infiltration symptoms in the basement:

When your basement has water infiltration and high humidity in the concrete, you may notice the following symptoms:

  • Presence of a white powder on the concrete (efflorescence)
  • Presence of mold at the bottom of the basement walls
  • Damp or wet concrete on basement floor
  • Persistent high humidity and bad odors

Cause of water infiltration in the basement:

During heavy rains or snowmelt, water exerts hydrostatic pressure on the foundations. This causes water to seep in or absorb water through concrete.

This is caused by:

  • Poor drainage: In some cases, the drain appears clear, but the surrounding soil obstructs the access holes and prevents water from being drained.
  • Iron ochre: The drainage system is blocked by orange mud or slime like substance that sticks to the drain. This problem occurs when iron bacteria is present in the water. When this bacterium come into contact with the atmosphere, it oxidizes and produces a gelatinous slime that clogs the drain and prevents the drainage of water.
  • No drainage system: In buildings dating back to before 1950, there is no French drain around the footing of the foundation. During periods of rain and snowmelt, the water pressure on the foundations causes infiltrations around the weak points in the foundation.

The solution: exterior or interior drainage systems

If you have water infiltration in your basement, work should be considered to waterproof the foundation and drain the soil. It is possible to drain excess water from the ground to dry the basement with an interior or exterior drainage system.

Outdoor drainage work

  • Excavation near the foundations using equipment that minimizes damage to the property.
  • Cleaning and waterproofing with a jointless elastomer membrane, sprayed below ground level.
  • Soil draining is installed by French drain at the foot of the foundation, covered with crushed stone.
  • A drainage panel is installed below ground level to protect the membrane and provide vertical drainage (optional, depending on the type of soil).


WARNING: Outdoor drainage sometimes encounters obstacles that aredifficult to bypass or costly to demolish and rebuild. Buildings with adjoining walls, such as townhouses, also present problems for the outside approach. Indoor drainage is a more economical and appropriate state-of-the-art technique.

Indoor drainage works

A patented indoor drainage system combining the waterproofing membrane, Drain SDI Pro and MultiFlow is the most complete and efficient sealant on the market for indoor drainage. This is the first ultra-modern technology that allows you to waterproof your foundations efficiently, minimizing demolition work and often at a lower cost than the traditional approach. Furthermore, the MultiFlow floor drain is easier to handle and insert than a standard perforated drain, since it is narrower.

Our unique system captures water leaks, controls hydrostatic pressures and reduces slab moisture.

  • Preparation of a trench along the foundation walls.
  • Installation of the Drain SDI Pro floor drain system, designed by Safe Basements Inc., horizontally above the foundation footing. The Drain SDI Pro stops water infiltration and redirects it to the MultiFlow drain, located under the concrete slab.
  • Installation of a sump pump basket connected to the drain with a discharge line.
  • The SDI Pro drain is covered with crushed stone and concrete leveling out to the existing slab.
  • The system can also be installed with inspection and cleaning ports.

Presence of iron ochre?

If the drain on your property has gelatinous, reddish deposits, it could be iron ochre. The traditional solution for waterproofing your foundation and keep your drains clear is to lift the residence and create a waterproof basin. It is a question of installing a waterproof membrane under the concrete that goes up to the outside of the foundations.

Bisson Expert offers an indoor drainage system with several access points for properties with the presence of iron ochre. This unique waterproofing approach allows the owner to control the system to ensure the drain is kept clear. With regular maintenance, the drainage system with several access points remains clear and resists iron ochre. The state-of-the-art system developed by Bisson Expert allows the problem of iron ochre to be managed in a non-invasive and efficient manner at a lower cost.

Contact our experts now for an estimate and find the best solution for your property.