12/03/2025
An internal drainage system is one of the most effective basement waterproofing solutions for managing water that enters or builds up around your foundation. Here’s a clear breakdown of what it is, how it works, and when it’s recommended:
🔧 What Is an Internal Drainage System?
An internal drainage system (sometimes called an interior French drain, perimeter drain, or water control system) is installed inside your basement, along the perimeter of the foundation.
Its purpose is to collect and redirect groundwater or seepage before it can rise up through the floor or leak through the walls.
🛠️ How It Works
Concrete is cut along the basement perimeter.
A trench is dug next to the footer.
Drain tile (perforated pipe) is installed in the trench.
The pipe is surrounded with gravel to promote drainage.
Water collected flows toward a sump pit.
A sump pump discharges the water safely away from the home.
The trench is sealed with new concrete.
✔️ Benefits of Internal Drainage Systems
Highly effective against hydrostatic pressure (water pushing through floors/walls).
Works even if outside is inaccessible (tight lot, finished landscaping, neighboring structures).
Typically less expensive than exterior waterproofing.
Allows additional systems like:
Wall v***r barriers
Dehumidifiers
Moisture control liners
📌 When You Need an Internal Drainage System
You may need one if you notice:
Water coming up through floor cracks
Basement walls leaking at the bottom
Water pooling where the wall meets the floor (cove joint)
Mold/mildew growth
High humidity or musty odors
Persistent dampness after rain
Call us for a free estimate
586-522-2840 or 586-515-3018
