I ovserved an 8’ long horizontal crack at the side of the foundation footing in the crawlspace. The crack was 1/2" wide at its widest. The foundation wall above the footing was about 40" high and had no cracks or signs of movement. This is a two story beach house. The rest of the foundation looked great. What caused the crack? Corroded re-bar? 1979 2 story home.