Like any basement wall, concrete masonry basement walls may crack or bulge if lateral pressures are too great. SELECTING A REPAIR TECHNIQUE Wall cracks can be caused by a one-time overload or by normal earth and water pressure. In cases when the load is not likely to occur again, techniques can be used that repair the crack and restore the wall to its original strength. If the wall cracked due to normal earth and water pressures, it was probably underdesigned or built poorly. To correct the problem, you can't just treat the symptoms and patch the crack. METHOD 1: REDUCE LOADING Excessive lateral earth pressures are frequently caused by saturated clay backfill. The most effective way of reducing this pressure is to remove the clay backfill and replace it with compacted, free-draining granular fill. METHOD 2: ADD BUTTRESSES OR PILASTERS To make the basement wall transfer loads horizontally, intersecting walls, buttresses, or pilasters can be placed at spacings of less than 12 feet. METHOD 3: INSTALL EARTH ANCHORS Anchors or tiebacks can be used to tie the wall to the earth. METHOD 4: ADD REBAR AND GROUT Unreinforced block walls can be strengthened by installing vertical rebar in designated cores and filling the cores with grout. METHOD 5: INJECT EPOXY If the basement wall is made of solid block or is fully grouted, injecting epoxy into cracks can restore the wall's original strength. METHOD 6: APPLYING SURFACE BONDING Surface bonding can be applied easily to the inside face of a cracked block basement wall to increase the tensile strength of the wall face.