Basement moisture is one of Ontario’s most common home problems. Freeze-thaw cycles, high water tables in GTA, and aging weeping tile all contribute. Here is how to approach waterproofing correctly.
Exterior Waterproofing
Excavate to footing, apply waterproofing membrane and drainage board, install new weeping tile, backfill with clear stone. The gold standard. Cost: $15,000-$40,000+ full perimeter. Disturbs landscaping. Required for active foundation cracks or failed weeping tile.
Interior Drainage System
Perimeter drainage channel at interior footing, water directed to sump pit. Manages hydrostatic pressure from inside. Cost: $8,000-$20,000. Less disruptive. Manages water after entry — does not stop it from getting in. Best where exterior excavation is impractical.
Crack Injection
Polyurethane or epoxy injection for isolated active cracks. Cost: $500-$2,000 per crack. Effective for poured concrete wall cracks. Not a drainage system substitute.
Sump Pump
Every waterproofing system needs a reliable sump pump. Battery backup essential — power outages coincide with heavy rain events. Primary + battery backup: $500-$1,500 installed.
Contractor Vetting
Reputable companies offer 25-year transferable warranties. Get 3 quotes. Be wary of companies offering only one solution type.
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