French drains are very effective for the removal of unwanted water from foundations. They are trenches filled with gravel that drives water away from the building. Generally, they are excavated then installed with a perforated pipe and stone with a little bit of topsoil.
If you have wet basement issues, installing a French drain system could be the answer you are looking for.
French drains are installed beneath the ground’s surface and are out of sight when installed. The drainage pipe could be from 4 to 12 feet long to allow excess water to flow away.
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When to Replace a French Drain?
Does heavy rainfall or melting snow leave your yard all soggy and wet? Is standing water a common occurrence in your home?
You need a good French drain on your property to avoid costly problems down the road. A French drain has no mechanical parts, making it convenient and affordable for homeowners to install.
But nothing lasts forever. If you have an existing French drain that is no longer effective in preventing water accumulation, it is time to talk to the experts.
The lifespan of a French drain varies depending on these factors:
- Quality of the materials;
- Quality of maintenance performed;
- Environmental factors (exposure to standing water, corrosive soil, etc.)
In general, a French drain typically lasts from 20 to 30 years. Issues will start to crop up to let you know that your French drain is not working properly.
What are the signs you need a French drain replacement?
#1: Presence of Humidity
In general, prolonged moisture in the basement could be a sign of an ineffective French drain. It means your existing system lacks the capacity to redirect water that collects around the foundation, causing increased humidity.
If the basement walls seem to be moist, the foundation of the home might have an excessive amount of water near the foundation.
Professionals can check the basement and ascertain if the French drain is, indeed, the culprit. At any rate, it is imperative to get it fixed as quickly as possible for your personal health.
#2: Concrete Efflorescence
If white powder is visible on the concrete’s surface, it indicates efflorescence, a state wherein the minerals in the concrete rise due to exposure to moisture.
When efflorescence in the basement walls is significant, it is a sign of a faulty drainage system of the foundation.
Maybe signs of water infiltration or humidity are not yet visible but you notice excess water on the property. A camera drain inspection can be done to see the condition of the drainage system. After all, it may just need cleaning.
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Steps to Take Before a French Drain Replacement
The best tip to know when replacing a French drain is to do elimination. Check for signs of efflorescence or humidity in the basement, and get a French drain camera inspection.
Drain camera inspection in the Greater Toronto Area costs around $100 to $120. For more complex problems such as multiple drains, the contractor may charge on an hourly basis.
After the camera inspection, you will know if the French drain needs partial replacement due to a broken part or if it is completely damaged.
The replacement of the entire French drain must be a last resort. You can have a partial replacement or opt for cleaning.
Know when the exact year the French drain was installed or replaced. If it is 20 years or more, you should get a complete replacement.
If it has reached the end of its life as advised by drainage professionals, it is better to replace it completely than to risk constant repairs which are more expensive over time.
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The Process of French Drain Installation
Contractors follow a process for a French drain installation to make sure of efficient water drainage and diversion.
The following is a brief description of the steps:
- Site Inspection: This is the first step to find the best location for the French drain.
- Excavation: Digging the trench to follow the target path of the drain follows. Its depth and width will be based on the drainage requirements.
- Pipe Installation: A perforated pipe is then installed at the bottom of the trench and surrounded with permeable landscape fabric to stop clogging.
- Gravel Installation: Rocks or gravel is placed on top of the pipe to prevent the soil from clogging the drainage.
- Installation of geotextile fabric: The fabric will prevent gravel and aggregate from combining with the soil so that water can pass through.
- Backfill: Soil is used to backfill the trench to create a level surface and protect the pipe.
- Testing – Testing is done to check that the drainage system is working properly. Water will be run through the system to look for possible leaks or clogging.
The process may vary based on your property’s requirements. Consult a professional with a solid reputation and experience with French drain installation.
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The cost to replace a French Drain
The average cost to replace a French drain varies. Contractors can charge between $25 and $50 per linear foot. Homeowners may pay from $6,000 to $15,000 for a French drain. It is hard to quantify because it all depends on the requirements of your property.
Yes, this is no small sum so it is best to deal with reputable French drain professionals to get your money’s worth.
The project’s cost will vary based on the excavation work, installation, the materials, and labor. Other factors like the type of soil, the distance from the sewer, waterproofing work, and foundation repairs also have an impact on the price.
One of the most common problems when installing French drains is accessibility. Neighboring properties might be so close that excavation becomes difficult with average equipment. If it takes longer to excavate due to access issues, the price can also increase.
Refer to the table below for more detailed prices on work related to French drain repairs or replacement.
| Type of Work | Average Cost |
| Drain and waterproofing | $180 to $220 |
| Window well | $750 |
| Repair of cracks | $1250++ (exterior) $700 ++ (interior) |
| Drain in front of the garage | $2,200 |
| Submersible pump (basement) | $2,000 to $2,300 |
| Water outlet / sewer | $7,000- $10,000 |
Installing or replacing a French drain is an investment with a lifespan of 25 years or more. Contractors normally provide warranties against malfunction.
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FAQS about French Drain Replacement in Ontario
We understand that a French drain replacement or installation is a significant investment. We have gathered some frequently asked questions to be your guide.
What is the required depth of a French drain in Ontario?
It is important to have the right depth for the trench, usually 18 to 24 inches to ensure efficient water capture and redirection.
Do you need a permit to install a French drain?
You may need a permit to install a French drain, depending on your local planning authority. Plumbing installations or replacement of any part of a plumbing system must comply with the regulations of the Ontario Building Code.
Why are French drains essential in Ontario?
French drains are important because they are affordable, easy, and effective for drainage issues in your yard, around your home, or to help prevent excess moisture in your basement.
Stagnant water along the foundation can result in moisture leaking through to the basement. It can result in foundation issues, increased insect population, and promote the growth of bacteria and mould.
How close should a French drain be to the house?
Ideally, a French drain must be installed 4 to 6 feet away from the foundation to avoid water accumulation. The distance can vary, however, based on the severity of the problem and the landscape of the property.
Will installing a French drain ruin the appearance of my yard?
Homeowners can choose many landscaping options for installing a French drain. Skilled landscapers can use stones and other accents to improve and enhance the appearance of the yard with a French drain.
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