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Hairline cracks are common while fresh concrete cures. They usually tighten up as the wall dries and the temperature and moisture levels stabilize. Watch them over the first few weeks, and if they grow wider than about 1 inch—or begin to leak—bring in a concrete pro right away. Paying attention early on keeps a minor surface issue from turning into a structural problem.
A well-built concrete wall can last anywhere from 30 to 100 years. Routine inspections, prompt crack repairs, and proper waterproofing push it toward the upper end of that range, while heavy loads or constant moisture can shorten its life. Some reinforced foundation walls even reach the two-century mark, but once the wall nears its expected lifespan, schedule a structural evaluation to catch early signs of damage and deterioration.
Concrete is porous, so water can seep through over time. Below-grade walls require waterproofing and moisture management during installation with membranes or sealants. Proper drainage also protects the walls from absorbing too much moisture. For above-grade walls, a breathable sealant and proper grading usually do the trick. Add a dehumidifier or sump pump in damp basements to keep moisture in check. Address leaks quickly, as persistent water can weaken the wall and invite mold growth.