Specialists in cast iron main drain stack repair and replacement in Kitchener, Waterloo, Cambridge & Guelph. 30+ years on older KW Region homes.
Kitchener-Waterloo has a large stock of older homes — many built between the 1920s and 1960s — with cast iron main drain stacks that are now reaching the end of their service life. Cracks, holes, and corroded joints in cast iron stacks cause drain backups, foul smells, and water damage. We specialize in diagnosing and repairing these systems, having worked on them across the region for over 30 years.
Before any repair, we assess the full extent of the problem. Cast iron stacks often have multiple failure points — a hole in one section may be accompanied by cracked joints or corroded fittings elsewhere. We inspect the full stack and give you an honest picture of what needs to be done and why.
If your stack has localized damage — a single hole, cracked fitting, or failed joint — we can repair just the damaged section rather than replacing the entire stack. We use approved repair methods and materials that meet Ontario plumbing code requirements.
When a cast iron stack is extensively corroded or has multiple failure points, full replacement is the most cost-effective long-term solution. We replace the entire main stack with modern PVC or ABS drain pipe — quieter, more durable, and maintenance-free for decades.
The vent portion of your main stack — the section that exits through your roof — is just as important as the drain portion. A blocked or damaged vent causes slow drains throughout the house and can allow sewer gas to enter. We repair and clear stack vents as part of our cast iron stack services.
Cast iron main stacks connect to branch drain lines throughout your home — kitchen, bathrooms, laundry, and floor drains. Where these connections have deteriorated, we repair or replace them and ensure proper slope and venting for each branch line.
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