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Not all foundation cracks are created equal.
Some are harmless — just cosmetic surface splits from normal settling. But others? They’re signs of something more serious: water intrusion, structural stress, or long-term damage that could threaten your basement and your home’s safety.
Here’s how to tell the difference, and what UPR recommends if you spot a crack in your foundation.
There are a few common reasons we see cracks in concrete or block foundations:
Natural settling of the home over time
Water pressure building up in the soil around the basement
Freeze-thaw cycles (especially in GTA winters)
Poor drainage or clogged weeping tile
Hydrostatic pressure pressing against walls
Structural shifts or poorly compacted soil during construction
Here’s a simple breakdown:
| Type of Crack | What It Could Mean |
|---|---|
| Hairline vertical crack | Normal settling, often not serious |
| Wide vertical crack | Water may be entering — needs sealing |
| Horizontal crack | Serious pressure — could indicate wall bowing |
| Stair-step crack (in block walls) | Possible shifting or foundation movement |
| Crack with water stains | Active leak — waterproofing needed ASAP |
If you’re unsure? We can inspect and moisture test the area to tell what’s urgent and what’s not.
Once water finds its way in through a crack, it doesn’t stop. Over time, it can:
Weaken your foundation
Promote mold and mildew
Rot framing or insulation in finished basements
Devalue your property
Lead to full-blown basement flooding
We offer both interior and exterior repair options, depending on access and severity.
Polyurethane injection — Fills cracks from inside, sealing leaks and flexing with the wall
Exterior crack repair — Dig down, seal the crack from outside, apply membrane & drainage layer
Structural solutions — For severe cracks, we reinforce the wall with carbon fiber or braces
Waterproofing system — If cracks are part of a bigger leak issue, we may recommend full waterproofing
Cracks aren’t always urgent — but they’re never something to ignore.
At UPR, we’ll give you a straight answer. If it’s harmless, we’ll tell you. If it needs repair, we’ll explain your options and do it right the first time.
Call 647-833-6743
Book a Foundation Crack Inspection
Serving Toronto, Mississauga, Scarborough, Etobicoke & more
