Weeping tile replacement

Weeping tile is the perforated pipe that runs around the outside of your footing, buried since the house was built, doing the single most important job in keeping a basement dry. Nobody thinks about it until it stops working. When it does, the symptoms look like a foundation problem: water at the floor and wall joint, a sump that never stops, efflorescence blooming across the block.

Why it fails. Houses built in Ottawa before roughly the 1970s often have clay tile, short lengths of unglazed pipe laid end to end with gaps between them. Roots find those gaps, and silt fills them. Later houses have perforated plastic pipe, which does not rot, but which crushes if it was backfilled carelessly and silts up over decades if it was laid without filter fabric or clean stone around it. Either way the failure mode is the same: the pipe stops carrying water and the ground beside your footing becomes a reservoir.

Step one: confirming that this is the problem. Before anyone digs, the drain should be investigated. A camera down the sump inlet or a cleanout will show whether the pipe is intact, crushed, root-bound or simply full of silt. A silted line can sometimes be flushed and jetted for a fraction of the replacement cost. Skipping this step and going straight to excavation is a common and expensive mistake.

Step two: locates and access. A locate request through Ontario One Call is legally required, free, and should be submitted at least five business days before digging (Ontario One Call, homeowners). Landscaping, decks and walkways along the wall come out. Because the new pipe sits at the footing, the trench goes the full depth of the basement.

Step three: the replacement itself. Old pipe is removed, the footing is exposed and cleaned, and new perforated pipe is laid on a bed of clear stone with the perforations oriented correctly, wrapped in a filter sock or with fabric over the stone to keep silt out. It is pitched to run toward the sump pit or the storm connection. Because the wall is open anyway, this is the natural moment to apply membrane and drainage board, which is why weeping tile replacement and exterior waterproofing are usually quoted together.

Step four: the connection and the backfill. The new line is tied into the sump pit or the storm lateral, a cleanout or inspection point is added so the drain can be camera-checked in future without digging, and the trench is backfilled with free-draining granular material in lifts rather than dumped clay. Final grading falls away from the house.

How long it takes. One wall is typically three to five working days. A full perimeter is two to four weeks. Add a week at the front for locates. Camera inspection alone, if that is all you need for now, is an hour or two.

What it costs in Ottawa in 2026. Indicative ranges. A camera inspection of an existing drain is commonly $200 to $600. Flushing and jetting a silted line, where the pipe is otherwise sound, is often $500 to $1,500. Replacement is priced with the excavation, so it sits inside the same band as exterior waterproofing, roughly $150 to $300 per linear foot of wall, and a full perimeter frequently totals $20,000 to $42,000. What moves it: depth, access for a machine, what has to be removed and reinstated, and whether the storm connection at the street end also needs work.

What makes an Ottawa house different. Two things. Champlain Sea clay means the drain is carrying water that has nowhere else to go, so a failed line shows up faster here than it would on sandy ground (NRC, Geotechnical properties of Leda clay in the Ottawa area). And the ownership line matters: the City of Ottawa maintains the sewer service from the sewer main to the property line, and the property owner is responsible for the section from the property line to the house (City of Ottawa, water and sewer homeowner responsibilities). If your weeping tile drains to a storm connection, the part under your front lawn is yours, and the City page also notes that repairs to private service lines may not be covered by basic homeowner insurance.

Who should do the work. Excavation and drainage are not licensed trades in Ontario, so check liability insurance, WSIB coverage and the locate process instead. Where the new drain connects to a sewer lateral, that connection is plumbing work, and plumber is a compulsory trade requiring a current Certificate of Qualification, checkable on the Skilled Trades Ontario public register. Connecting to a City sewer also needs the City's permission under its sewer connection rules.

What to ask before you hire. Will you camera the existing drain before quoting replacement. Can this line be flushed instead. What pipe, what stone, and is filter fabric or a sock included. Where does the new line discharge. Will you add a cleanout so it can be inspected later. What are you backfilling with. Is membrane on the wall included while the trench is open, because doing it later means digging twice.

If a contractor quotes full weeping tile replacement after looking only at a wet patch on your basement floor, ask for the camera inspection first. It is a small cost that occasionally saves a very large one.