Interior vs. Exterior Waterproofing

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Full Method Comparison

	Interior	Exterior
Addresses root cause	Manages water inside	✅ Stops water at source
Disruption to yard	✅ None	Excavation required
Disruption to interior	Floor perimeter cut	✅ None
Typical cost	✅ Lower	Higher
Works on finished basements	✅ Yes	✅ Yes
Requires exterior access	✅ No	Yes
Protects foundation membrane	No	✅ Yes
Best for	Managing recurring seepage	Long-term structural protection

© 2026 Canada Waterproofers. Recommendations are based on self-reported information and are indicative only. An on-site inspection is required for a definitive assessment.