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“ What’s a French drain? ”

For over 50 years Québec entrepreneurs have been installing drains around foundations. The main role of the French drain is to monitor changes in the level of the water table to prevent the water from rising above the building’s footing, causing water infiltration.

The firsts symptoms of a weak drainage system are:

  • bulky white powder line called EFFLORESCENCE at the base of the foundation;
  • high humidity level in the basement;
  • water infiltration;
  • cracks on the floor and the foundation.

Different common material used:

Clay tiles (Terra Cota)

Until the 60s, entrepreneurs were installing drains with clay tiles. The technique was quite rudimentary, but still worked for several years. Today, most of these drains now have to be replaced, as they are not equipped with a system preventing roots or soil to come in, and are not covered with enough stone. Thousands of homes in Quebec have this drainage system around the house. These owners will realize that the system is failing the day they open walls in the basement and realize the presence of mold and efflorescence.

We offer the inspection service of these drains. Pretty often, when the owner wants to investigate and know if it is clay tiles, we have to dig for access since these drains are connected by gravity drainage and have no inside access.

Flexible drains (Big O)

For decades, the agricultural drain was the only material used. Many entrepreneurs are still using this material but the techniques have evolved since. The advantage of this drain over the Terra Cota, is that it has more holes, so the water penetrates a lot easier. Some agricultural drains are coated with geotextile. This type of drain has been installed enormously in the last decade. This drain was revolutionary when it appeared on the market but the industry soon realized that this coating around the drain mostly ended up creating a barrier preventing water from entering the drain ESPECIALLY in the presence of iron ochre.

When we replace a French drain, we do not use this material. Being flexible, it tends to move and create up and downs on the building perimeter, creating water retention.

BNQ type drain

This drain is almost the same drain that is used for sewage. Being much more durable and smooth then an Agricultural Drain, this drain offers a longer lifespan and eliminates the risk of having ups and downs by installing it with the use of a laser. Perforated all around and with joints that unite the lengths of over 3 inches, it offers strength and performance beyond the industry standards. Since it is made entirely of plastic, the interior and exterior is smooth. When the time comes to clean it, it becomes effective as its new.

“We consider the BNQ drain has far surpassed all its competitors and that’s why we install it.”

“A work of this magnitude deserves to be well done and it only once!”

-Lesage Excavation’s Team

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