If the crack is going all the way from top to bottom it becomes a problem, and homeowner has to take an actions to investigate the causes and fix the crack.

There are few proper ways to fix cracked foundations: 1. From outside, by excavating the foundation down to the footing, exposing and cleaning the crack, applying hydraulic cement to the crack, waterproofing the foundation, reinforce the foundation with glass-fiber mesh. 2. From inside, by drilling multiple holes through the crack and injecting epoxy product.

First of all cracked foundation is a waterproofing issue, and water can and will penetrate inside the basement through the cracks. Second, if the crack expends it may become the structural issue, causing cracks and deformation to the building structures.