Cracks occur in the walls of our condo units, on occasion. Repair by excavation, patching cracks using hydraulic cement , hydromastic recoating, sheathing with styrofoam, stone backfill and repalcement of earth,etc is very costly. many new inside methods are advdertised on the Internet. Expoxy resin injection seems to be the favored procedure but one contractor recommended a procedure which cleaning the crack, gluing a vintl sheet plastic coated to the wall using silicone,anchored with pins shot into the wall. Below the crack,the concrete floor is cut out exposing the PVC drainage tile to a pumped sump.This will carry leakage continuously. He will provide a lifetime guaranty. Has anyone reading this have any experience with either method. Comments pro or con much welcomed. Jim Fallon