Not every crack is a crisis
Most concrete cracks. The question is whether a crack matters. Here’s how we triage a slab on a site walk.
Hairline cracks
Thin, shallow, often along a control joint. Usually shrinkage cracks from early-age curing. Cosmetic we seal them with a flexible caulk or epoxy and they’re done.
Medium cracks, stable
A crack wider than a credit card but not actively moving. We check for vertical displacement (one side higher than the other) and for recurrence across the slab. If the slab is stable, we route and seal with a flexible structural sealant. Life goes on.
Medium cracks, moving
Cracks that are widening year over year, or showing freeze-thaw damage at the edges. These point to base failure or reinforcement issues. Sometimes we add deck pins or inject epoxy to stabilize the base. If the slab is thin or the reinforcement is wrong, we recommend replacement.
Structural cracks in walls
Diagonal cracks in foundation walls, horizontal cracks indicating pressure from outside, or cracks with water intrusion these are never cosmetic. We call in an engineer, look at the drainage, and rebuild what needs to be rebuilt. This is not a DIY situation.
Surface scaling and spalling
The top quarter-inch of the slab is popping off in patches, especially on driveways and walkways that see deicers. This is freeze-thaw damage on concrete that wasn’t air-entrained properly or wasn’t sealed. Overlay or resurface if the underlying slab is sound. Replace if the damage is deep.
Settlement
The slab has dropped at one end or one corner. Doors that used to clear now drag. Depending on the severity, we can sometimes stabilize and correct the issue. In many cases, replacement is the long-term answer.
When to replace outright
- The slab is too thin for its use (happens with old home garages and pole-barn floors).
- Reinforcement is insufficient or corroded.
- Multiple failure modes are present at once (cracked and settled and scaling).
- The drainage issue that caused the failure hasn’t been fixed repair without fixing drainage just buys you a few years.
If you’re looking at a driveway, patio, foundation, or shop floor and not sure which column it falls into, have us take a look. Site visits are free across North Idaho. Call 1-208-304-3525.
