What are the common causes of vertical cracks in walls and how can they be effectively repaired?

Vertical cracks in walls are commonly caused by settlement of the foundation, shrinkage of building materials, or structural issues. To effectively repair these cracks, it is important to first identify and address the underlying cause. Repairs may involve filling the crack with epoxy or polyurethane injections, applying a patching compound, or installing carbon fiber strips for reinforcement. Consulting a professional is recommended for proper assessment and repair.