Identify the crack type and size
Monitor the crack for movement
Clean the crack area
Remove loose debris and damaged material
Seal small non-structural cracks with epoxy or polyurethane injection
Patch surface cracks with hydraulic cement or masonry repair compound
Install carbon fiber reinforcement for widening or recurring cracks
Repair drainage issues around the foundation
Extend downspouts away from the house
Regrade soil to slope away from the foundation
Fix leaking gutters, pipes, and plumbing
Improve exterior waterproofing
Install or repair a sump pump if needed
Address soil expansion or settlement issues
Underpin or stabilize the foundation if settlement is severe
Consult a structural engineer for large, horizontal, or stair-step cracks
Hire a licensed foundation repair contractor for major repairs