Interior Basement Drainage Systems
An interior drainage system is one of the most reliable methods for controlling basement water intrusion. Instead of trying to stop water outside, these systems manage water after it enters and safely redirect it away from the foundation.
At Schmitt Waterproofing, we install sub-floor drainage systems using proven methods designed for long-term performance and minimal disruption.
How a Sub-Floor Drainage System Is Installed
Precision Concrete Cutting
We begin by cutting the concrete floor along the foundation wall using a professional concrete saw. This creates a clean, straight edge and minimizes unnecessary disturbance to the surrounding slab.
Concrete Removal & Trench Preparation
The cut concrete section is carefully removed, and the area beneath the slab is excavated to create space for the drainage system. All debris is cleared to ensure proper placement of piping and gravel.
Foundation Wall Drainage (Block Foundations)
If the home has cinder block foundation walls, we drill weep holes in the bottom course of block. These holes allow trapped water inside the hollow blocks to drain freely into the system instead of building pressure and leaking into the basement.
Drainage Pipe or Footer Track Installation
Depending on the system design and foundation type, we install either: A perforated drainage pipe placed alongside the footing. A drainage track installed directly on top of the footing. Both methods are designed to capture groundwater and wall seepage efficiently.
Gravel Filtration Layer
Clean gravel is placed around the drainage system to filter incoming water and prevent sediment from entering the pipe. This improves water flow and helps protect the system long-term.
Concrete Restoration
Once the drainage components are in place, the concrete floor is poured back and finished flush with the existing slab. This restores the floor’s appearance while maintaining full system functionality.
Optional Vapor Barrier Installation
Vapor barriers can be added along the foundation wall to help manage moisture vapor and improve overall humidity control within the basement.
Sump Basin & Pump Installation (If Needed)
When gravity drainage is not possible, a sump basin is installed to collect water from the drainage system. A sump pump is then used to discharge water safely away from the foundation through a dedicated outlet line.
Protect What Matters Most
Why Sub-Floor Drainage Systems Work
- Relieves hydrostatic pressure beneath the slab
- Captures wall and floor seepage
- Prevents recurring basement leaks
- Works year-round, regardless of soil conditions
- Minimal impact on exterior landscaping
Is a Sub-Floor Drainage System Right for Your Basement?
Advantages of Interior Drainage Systems
- Handles high water tables
- Relieves hydrostatic pressure
- Works year-round, rain or shine
- Minimal exterior disruption
Ideal Applications
- Finished or partially finished basements
- Homes with recurring seepage
- Block or poured concrete foundations
Ready to stop basement water problems for good?
Schedule your free inspection with Schmitt Waterproofing today and get a custom sub-floor drainage solution designed for your home.
FAQs About Interior Basement Drainage
What is an interior drainage system?
An interior drainage system collects water that enters the basement and redirects it away from the foundation, usually to a sump pump or drainage outlet.
How long does the installation take?
A partial interior drainage system typically takes 1–2 days, while a full basement system usually takes 4–5 days. In finished basements that require flood-cutting and removal of drywall or framing, installation can take 7–10 days depending on site conditions and access.