A. Mike Strom. Foundations are rigid and tend to crack over time. Minor cracks are normally not a cause for alarm. Major cracks, on the other hand, indicate that there is movement and can undermine the home’s structural integrity. If the cracks are severe and many, it’s best to hire a structural engineer to evaluate the problem. A vinyl concrete patch is a good choice because of its elasticity. Mixed with a latex liquid, this can provide a good seal. It is, however, always recommended that you hire a professional who can inject the crack with an epoxy that will last for a long time and are usually guaranteed against re-cracking. Read more about repairing wall cracks