French Drain Installation in Toronto

Our French drain installations start with a thorough site survey where we map the property’s natural water flow using grade measurements and observation during wet conditions. We then design a trench layout — typically 12 to 24 inches deep and 12 inches wide — that intercepts water at the right point. The trench is lined with non-woven geotextile filter fabric, which prevents Toronto’s fine clay particles from silting up the gravel bed. We lay 4-inch perforated pipe (holes down, as per best practice) on a bed of 3/4-inch clear washed stone, then fill the trench to grade with more stone before wrapping the fabric over top. The system is sloped at a minimum of 1% grade toward the discharge point.

Where the water goes is just as important as how it’s collected. Depending on your property, we discharge to a dry well (a buried infiltration chamber), a sump pump connection, or a gravity outlet to the street or rear yard — always in compliance with City of Toronto bylaws regarding stormwater management. We never connect French drains to the sanitary sewer, which is both illegal and counterproductive. For properties near Lake Ontario with high water tables, we often combine a French drain with a curtain drain strategy that creates an underground barrier redirecting water around the entire structure.

One thing we always tell homeowners: a French drain is not a substitute for foundation waterproofing — it’s a complement to it. The French drain handles surface and shallow water, while foundation waterproofing and weeping tile handle deep groundwater. When both systems work together, your basement stays dry regardless of what Toronto’s weather throws at it. We warranty our French drain installations for 20 years and include cleanout access points so the system can be maintained without digging it up.