"Major" cracks are those that are more than 3/4 inch wide and have a tilting base. The discovery of these fissures would be reason for alarm, since it might indicate a far more costly structural problem. When fractures grow this serious, it is important to seek the advice of a professional foundation specialist or a structural engineer. Basement cracks can be caused by a variety of factors including shifting soil levels, moisture problems, excessive humidity, underground gas lines, uneven heating or cooling systems, and even plumbing leaks. Cracks in basements are often overlooked because they aren't visible until they reach a significant width or length. It is important to address basement cracks as soon as they are discovered so that necessary repairs can be made before additional damage occurs. Crack repair is best left to professionals because there are many different materials that could be used to fill in gaps and restore stability to damaged foundations. Some common solutions include polyurethane foam, epoxy resins, grout, and concrete. Professionals will be able to determine which material is best for your situation to ensure a long-lasting fix. Basement flooding is another common cause of basement damage. This problem can occur when it rains hard enough to push water under the house into areas where it cannot drain away. Flooding can cause major structural damage over time due to rising dampness and the formation of mold.