Learning Centre
Interior vs Exterior Foundation Crack Repair
Both methods work. The right choice depends on your home, the crack, access conditions, and your priorities.
CrackStop performs both interior crack injection and exterior crack repair. We don't default to one method over another — we recommend the approach that best fits the actual problem, the home, and the homeowner's situation.
Below is a clear breakdown of both methods — when each tends to make sense, and what factors should drive the decision.
Interior Crack Injection
Often the most practical and cost-effective approach
- No excavation — no disruption to yard or landscaping
- Completed in hours, not days
- Significantly less expensive than exterior in most cases
- Bonds the crack shut from wall face to wall face
- Works well when exterior access is limited
- Year-round — not weather dependent
- Lifetime warranty included
Best suited when: Exterior access is limited, the basement is unfinished or partially finished, cost is a priority, or disruption to the yard or landscaping needs to be minimized.
Exterior Crack Repair
The right choice in specific situations
- Addresses the crack and waterproofing membrane together
- No interior disruption to drywall or finishing
- Appropriate when the exterior membrane has failed
- Well-suited when the basement is heavily finished
- Can be the better fit when exterior access is easy
- Allows inspection of the wall exterior
Best suited when: The basement is heavily finished and interior access would require significant drywall removal; exterior access is straightforward; or the waterproofing membrane outside the wall has failed.
What Actually Drives the Decision
Basement finishing
A highly finished basement can make interior access costly — exterior may be less disruptive.
Exterior access
Decks, patios, and tight clearances can make exterior excavation impractical.
Crack type and condition
Some crack types and wall conditions are better suited to one method over the other.
Water involvement
Active or recurring leaks may influence which method seals more reliably in a given situation.
Budget
Interior injection is typically significantly less expensive. Budget is a real consideration.
Repair goals
Do you want minimal disruption? Maximum exterior protection? That shapes the recommendation.
The Honest Bottom Line
There is no single method that is always correct. Interior injection is practical and cost-effective in most situations. Exterior repair is the better fit in others. The right answer depends on the actual home, the actual crack, and the homeowner's priorities.
CrackStop will assess your situation honestly and recommend the method that makes the most sense for your home — not the most expensive one, and not the easiest one for us.
Not sure which repair is right for your situation?
Direct contact is the best route — we'll assess your specific situation and give you a straight answer.