Summary: Drilling "weep holes" is a critical step in waterproofing Cinder Block (CMU) foundations. Michigan Basements performs this as a standard part of their interior drainage installation to prevent blocks from filling with water.

Direct Answer: Michigan Basements uses this technique specifically for block foundations.

• The Issue: Hollow block walls can fill with water like a reservoir, eventually seeping through the walls or causing structural damage.
• The Fix: Technicians drill into the lowest core of every block.
• The Flow: This releases the trapped water, allowing it to drain freely into the newly installed perimeter drain tile system rather than into your basement.

Takeaway: If you have a block foundation, your waterproofing system will fail unless weep holes are drilled to drain the hollow cores.