Rod Hole and snap ties in the poured concrete foundation walls can also be the source of leaks. Typically they are sealed by the basement foundation contractors with a black damproof spray at orginial construction stage. Typically we can seal snap ties and rod holes all from inside with an AquaSeal Flexible Grout™, or AquaPak™, but they can also be sealed without injection by using an adhesive. Tie rods and snap ties are metal bars that are inserted during the pouring process of the concrete to hold the wall forms together. Over time, water can penetrate these holes. Rod holes and snap ties should only be repaired with high-grade materials (not hydraulic cement) and by a professional for the best results. Please contact us if you have any other questions concerning leaking snap ties and rode holes.