How We Solved a Hidden Flooding Problem in an Old Town Alexandria Basement
When a historic Old Town Alexandria homeowner found his basement flooding despite a previous waterproofing system, he called DMV Foundation Solutions for help.
Our team uncovered an abandoned dewatering pit and failing under-slab drainage and then installed a comprehensive interior waterproofing system—complete with a sump pump upgrade, new drainage lines, and a fully finished basement. Today, the space is dry, livable, and protected for years.
The Challenge: Chronic Basement Flooding in a Historic Old Town Alexandria Home
Michael had recently purchased a historic end-unit townhouse in the heart of Old Town Alexandria—an area known for its charm and its aging infrastructure and tricky groundwater issues. Soon after moving in, he discovered his basement flooded during heavy rains.
Our Inspection Findings: Water Intrusion, Drainage Issues & Failing Sump Pump
Our Basement Waterproofing Solution: Interior Drain Tile and Sump Pump Upgrade
- Demolishing and removing approximately half of the basement slab for full system access.
- Removing all failed waterproofing components.
- Installing a full under-slab drainage grid using 6″ perforated pipe with filter socks.
- Backfilling with 6″ of #57 clean gravel to allow groundwater to flow freely beneath the slab.
- Installing dimpled drainage matting along interior walls to assist with wall runoff.
- Replacing the existing sump with a new PitBoss ¾ HP sump pump and Wi-Fi-enabled battery backup system.
- Excavating and removing the abandoned dewatering pit.
- Coordinating with the City of Alexandria for proper permitting and inspections.
Every step, from excavation to backfill, was documented, tested, and approved prior to slab pour-back.
The Outcome: A Permanently Dry Basement in Alexandria, VA
- Framing new interior walls
- Hanging drywall and painting
- Installing new flooring
More than six months later, including a spring season with record rainfall, Michael’s basement remains bone dry. No leaks. No musty smells. No stress.
Warranty & Follow-Up
What the Homeowner Said
Gallery
FAQs
Q: Do I need a sump pump in my basement?
Q: Can waterproofing be done from the inside?
A: Yes, and in many cases, it’s the best option. Interior systems handle groundwater that makes its way in and route it to the sump pump. It’s ideal when exterior excavation is impractical.
Q: Is interior waterproofing effective?
A: When properly installed, absolutely. It’s a smart, efficient, and long-lasting way to manage moisture especially in urban or historic areas like Old Town.
Q: Does this kind of work require permits?
Contact DMV
If your basement is still leaking—even after a previous repair—let’s talk. Our inspections are free, and our solutions are built to last.
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