I have used the following method on several retrofit homers with 100% success of:
Don’t drill through the footings or wall !
• Break out concrete basement floor approximately 18 " from the outside walls.
• Dig out a trench to the bottom of your footing. (Below floor, 1' to 2' deep)
• On the very first course of block, drill a series of ¾" hole into each block cavity releasing any trapped water from within the block.
• Install drainage board in front of drilled holes from the weeping tile trench up wall to just below the bottom of the floor.
• Place 4" weeping tile (Fabric covered) beside your footing.
• Inside weeping tile can now be hooked up to sump box or closest floor drain.
• Excavated area should be covered with ¾" gravel to just below floor level
• Re-pour concrete floor leaving ¾ gap space at wall
Success !
A lot of work but well worth it. I never did understand why builders just did not put weeping tile and proper exterior sealing and drainage board on foundations.
Do not drill holes into a poured concrete wall.
• To install an inside weeping tile system for a poured concrete foundation, the process is the same.
• Drainage board will allow any water, that has gained entry, to freely drain into new weeping tile system..
Dont's:
1. Again, do not drill holes into a poured concrete wall or footings !
2. Do not dig deeper than the bottom of your footing.