I have a basement with two types of cracks. One crack is horizontal, about 1/2" thick and is in the center of the basement wall, about 80% of the width of the entire house in length (maybe 20 feet long). The other crack is in a step fashion, it follows the pattern of the concrete blocks and is about 6 ft. wide and 5 ft. long. I have sandy soils, no clay. I have no water leaking there. There used to be some large oak trees planted along that side of the house, I took them down. Also years ago there was flooding problems, but the town put in a storm drain system and that solved the flooding problem. My water table is about 6 ft. deep. How can I fix the cracks, is filling enough? The horizontal crack is located about 1 inch from the bottom of the block, not between blocks. Are epoxy injections better than concrete patch? Please help! Thanks.