Not All Foundation Cracks Are the Same
Some foundation cracks are cosmetic — minor shrinkage cracks that are common in poured concrete as it cures. Others are more significant, allowing water intrusion or indicating movement in the foundation. Understanding which type you have is the first step.
We assess the crack's width, orientation, length, and location to help you understand what it means and what, if anything, needs to be done.
Types of Foundation Cracks
- Vertical cracks: Often caused by concrete shrinkage or minor settling. Common and frequently repairable with injection methods.
- Diagonal cracks: Often caused by differential settling. The significance depends on severity and location.
- Horizontal cracks: These can indicate lateral soil pressure against the foundation wall and are generally the most serious type. Worth professional evaluation promptly.
- Stair-step cracks (block foundations): Follow the mortar joints in block walls and can be caused by settling or moisture-related movement.
Crack Repair Methods
For most non-structural vertical cracks in poured concrete foundations, epoxy or polyurethane foam injection is an effective, long-lasting repair. The material is injected under pressure throughout the full depth of the crack, bonding the concrete and sealing it against water.
Block foundation cracks and mortar joint failures are addressed differently — often through tuckpointing, hydraulic cement, and in some cases drainage improvements to reduce the water pressure causing the problem.
Structural cracks — particularly horizontal cracks indicating wall movement — may require engineering evaluation and reinforcement solutions. We'll be straightforward with you about what we're seeing.
South Coast MA Foundation Notes
Homes throughout Dartmouth, New Bedford, Acushnet, and the surrounding area have a mix of poured concrete and concrete block foundations — many of them aging. Winter freeze-thaw cycles in Massachusetts accelerate crack development. Early repair is almost always less expensive than waiting.
Request a Free Estimate →