Basement repairs are mostly water management and mechanical systems. Neither one waits patiently.
01Water infiltration through foundation wall
Water coming through a foundation wall at a specific crack is addressed with hydraulic cement — a fast-setting cement product that expands as it cures and stops active water flow. Clean the crack, chisel it into a V-shape to create a mechanical key, mix the hydraulic cement per instructions, and pack it into the crack while water is still flowing if necessary. This is a surface repair. Significant water pressure through multiple cracks, or water seeping through the wall surface broadly, requires a waterproofing professional.
02Sump pump failure
A sump pump that runs but doesn't move water has a failed impeller or a clogged intake screen. Pull the pump, clear the screen, and test it in a bucket of water. If it moves water in a bucket but not in the pit, the discharge line is blocked or frozen. A pump that doesn't run at all has a failed motor — replace the unit. A submersible sump pump runs $80–$200. Install a battery backup if the pump doesn't have one — the times you need a sump pump most are often during power outages.
03Efflorescence on block walls
White powdery deposits on basement block walls are mineral salts deposited by water moving through the block. They indicate moisture infiltration but are not themselves structural damage. Remove with a stiff brush and muriatic acid solution (diluted per manufacturer instructions, with full PPE). Address the source of moisture — typically grading or gutter discharge directed toward the foundation.
04HVAC condensate line clog
An air handler in the basement drains condensate through a line that exits the house. When that line clogs — algae growth is the usual culprit — the overflow pan fills and the system shuts off or overflows. Pour a cup of diluted bleach or white vinegar down the condensate drain access port quarterly. A clogged line is cleared with a wet/dry vacuum at the exterior drain end.
Marcus Webb is a general contractor and home maintenance writer based in Columbus, Ohio. He writes about the repairs and installs that come up every year in every house — the practical, repeating work that keeps a home livable.