Foundation waterproofing
and French drain
See how our team waterproofs your foundation and installs effective drainage, step by step.
The Cause
During heavy rainfall or quick snowmelt, water exerts hydrostatic pressure on the foundation. This leads to water infiltration or absorption into the concrete. This problem may be the result of:
- Poor drainage: In some cases, the drain appears unobstructed, but the surrounding soil may block the access holes and prevent water from draining out.
- Iron Ochre: The drainage system is clogged with orange sludge that sticks to the drain walls. This problem occurs when iron bacteria is present in the groundwater. When this bacteria comes into contact with the atmosphere, it oxidizes and produces a gelatinous material, which blocks the drain and prevents water from draining.
- No Drain: Often, in pre-1950 buildings, there is no French drain around the foundation footing. During heavy rainfall and quick snowmelt, the water pressure on the foundation leads to water infiltration and cement degradation.
The Long-Lasting Solution
If your basement shows signs of water infiltration, it’s essential to take action to protect your foundation. Waterproofing, combined with an effective drainage system, helps evacuate water and preserve the durability of the concrete.
Depending on the configuration of your building, two approaches are possible:
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Exterior drainage, installed around the foundation through excavation.
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Interior drainage, installed under the basement slab when exterior access is limited or impossible.
With the right drainage system, exterior or interior, we waterproof your foundation and keep it protected from water infiltration, no matter the constraints of your building.
The Scope of Work – Exterior French Drain
- Excavation near the foundation using equipment that minimizes damage to the property.
- Cleaning and waterproofing of the foundation with a seamless polyurea lining, sprayed below ground level.
- Installation of a French drain at the footing of the foundation, covered with crushed stone.
- Connection of the drain to a catch basin to ensure proper water evacuation.
- Backfilling with suitable materials to guarantee soil stability.
Exterior drainage is a proven and durable method, but it can sometimes be limited by access constraints or require more extensive work. In townhouses, for example, shared walls often make excavation difficult. In such cases, the option of interior drainage can be considered.
The Scope of Work – Interior French Drain
The interior drainage system is a recognized and reliable waterproofing solution, equivalent to exterior drainage. This technology makes it possible to effectively waterproof your foundation while minimizing the demolition work required.
- Opening of a trench along the foundation walls.
- Installation of the interior drain at the footing of the foundation.
- Connection of the drain to a catch basin equipped with a sump pump to ensure proper water evacuation.
- Covering the drain with crushed stone, then finishing with concrete leveled to the existing slab.
Presence of Iron Ochre ?
If the drain on your property shows gelatinous, reddish deposits, it may be iron ochre. This buildup can clog the drainage system and lead to water infiltration problems.
Bisson Expert offers the installation of a rigid drain with cleaning chimneys, specially designed for properties affected by iron ochre. This system provides direct and easy access for regular maintenance, helping to keep your drains clear.
With this approach, you maintain a drainage system that is efficient, durable, and resistant to iron ochre without resorting to heavy or costly methods such as lifting the house.
Contact our experts today to find the best solution for your property.
Protect your foundations with the red polyurea lining
The new era of waterproofing
FREQUENTLY ASKED QUESTIONS
WHAT TYPE OF FRENCH DRAIN SHOULD I USE?
There are several types of French drains in Quebec, including rigid PVC drains (BNQ), flexible PVC drains (agricultural drains), and terra cotta drains. Rigid PVC drains (BNQ) are the best option available because they are very durable and offer the longest service life.
IS A FRENCH DRAIN MANDATORY?
In Quebec, all residences built since 1955 must be equipped with a French drain. If you live in an older home and aren’t sure whether a French drain was installed, it’s recommended that you check the construction plans.
HOW CAN I TELL IF MY FRENCH DRAIN IS DEFECTIVE?
There are some signs to look out for to determine if a French drain is defective, such as water infiltration after rain, constant moisture in the basement, mold, efflorescence, or a sump pump that isn’t working properly.
HOW DO I KNOW IF MY DRAIN NEEDS TO BE CLEANED?
A specialist can perform a camera inspection through the cleaning ports of your French drain to determine whether it needs maintenance. Additionally, if you notice signs of a problem, it may be a good idea to have your drain cleaned before considering replacement. Sometimes, a thorough cleaning is all it takes!
HOW LONG DOES A FRENCH DRAIN LAST?
The average lifespan of a French drain is 30 to 40 years, but this can vary depending on the material used and the quality of the installation.
More questions?
Contact us, and a representative will get back to you as soon as possible.
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FINANCING UP TO $100,000 FOR YOUR FOUNDATION REPAIRS
No matter what type of foundation repairs are needed, Bisson Expert is happy to offer its customers simple payment solutions thanks to our partnership with Financeit.
Our Satisfied Customers
The entire Bisson Expert team is committed to ensuring full customer satisfaction. Over the years, we have developed a proven process that encourages us to strive for excellence, thanks to our talented and committed team of experts.