Exterior Waterproofing
Stop water before it reaches your foundation. We install professional exterior French drain systems and foundation waterproofing throughout Central Maine using proven materials and techniques.
What Is Exterior Waterproofing?
Exterior waterproofing stops water before it ever enters your foundation. Unlike interior systems that manage water after it has already made its way inside, exterior waterproofing works from the outside to intercept groundwater, redirect surface runoff, and seal your foundation walls against moisture penetration.
We use the same materials and methods championed by the French Drain Man — high-performance drainage systems designed for real-world conditions. This approach addresses the root cause of basement water problems rather than just treating the symptoms.
Proactive Protection
Water is stopped at the source, before it can damage your foundation or enter your home.
Preserves Your Foundation
Keeps concrete and block walls dry, preventing erosion, cracking, and long-term deterioration.
Eliminates Hydrostatic Pressure
Drains water away from the foundation wall so pressure never builds up to force water inside.
Our Exterior Waterproofing Services
Comprehensive exterior solutions to keep water away from your foundation for good. We also offer interior waterproofing and crawlspace encapsulation for complete home protection.
Exterior French Drain Systems
We install high-performance exterior French drain systems using proven materials and methods popularized by the French Drain Man. These systems intercept groundwater before it ever reaches your foundation, channeling it safely away from your home.
- High-flow corrugated drainage pipe
- Washed stone aggregate for maximum flow
- Filter fabric to prevent clogging
- Proper slope for gravity-fed drainage
Foundation Membrane & Coating
We apply professional-grade waterproof membranes and coatings directly to your foundation walls. This creates a continuous barrier that prevents water from penetrating the concrete or block, even under hydrostatic pressure.
- Liquid-applied or sheet membrane options
- Dimple board drainage mat protection
- Covers cracks, joints, and porous areas
- Long-lasting, below-grade rated materials
Downspout & Gutter Drainage Solutions
Roof runoff is one of the biggest sources of foundation water problems. We connect your downspouts to underground drainage lines that carry water far away from your foundation walls.
- Underground downspout extensions
- Pop-up emitter discharge points
- Seamless integration with French drains
- Prevents erosion and pooling near foundation
Grading & Slope Correction
Improper grading is a leading cause of foundation water problems. We regrade the soil around your home so that surface water flows away from the foundation instead of toward it.
- Minimum 6-inch drop over first 10 feet
- Compacted fill to prevent settling
- Swale creation for water diversion
- Landscape-friendly solutions
Window Well Drainage
Basement window wells collect water and funnel it directly into your basement if not properly drained. We install drainage systems that keep window wells dry and functional.
- Gravel backfill for fast drainage
- Connected to perimeter French drain
- Window well covers available
- Prevents flooding through window openings
Our Exterior Waterproofing Process
Every project follows a proven, step-by-step process to ensure your foundation gets lasting protection.
Excavation Around Foundation
We carefully excavate down to the footing along the exterior of your foundation, exposing the full wall surface for treatment and drainage installation.
Install Drainage Pipe & Gravel Bed
A perforated drainage pipe is laid in a bed of washed stone at the footing level. This captures groundwater before it can build pressure against your foundation wall.
Apply Waterproof Membrane
We apply a waterproof membrane or coating to the entire exposed foundation wall, sealing cracks, joints, and porous areas to create a continuous moisture barrier.
Backfill & Grade
The trench is backfilled with clean aggregate and compacted soil, then graded to slope away from the foundation for proper surface water drainage.
Connect to Discharge Point
The drainage system is connected to a proper discharge point — either a pop-up emitter, dry well, or daylight outlet — so water is carried safely away from your home.
Why Exterior Waterproofing Is the Gold Standard
Interior waterproofing systems do an important job — they manage water that has already entered your basement and redirect it to a sump pump. But they are treating a symptom, not the cause. Water is still getting through your foundation walls, which means moisture, potential mold growth, and ongoing wear on your structure.
Exterior waterproofing is considered the gold standard because it prevents water from ever reaching the foundation wall in the first place. By combining proper drainage with a waterproof membrane on the outside of the wall, you eliminate the root cause of basement water problems.
The best approach? For many homes, we recommend a combination of exterior waterproofing and an interior drainage system for complete, belt-and-suspenders protection. Every home is different — we will evaluate your situation and recommend only what you need.
Benefits of Exterior Waterproofing
A properly waterproofed foundation protects your home for decades.
Prevents Structural Damage
Stops water from deteriorating foundation walls, mortar joints, and concrete over time.
Eliminates Hydrostatic Pressure
Drains water away before it builds up against your foundation, the #1 cause of basement leaks.
Protects Against Freeze-Thaw
Keeps water away from foundation walls so it cannot freeze, expand, and crack the concrete.
Increases Property Value
A dry, waterproofed foundation is a major selling point and protects your largest investment.
Permanent Solution
Exterior waterproofing addresses the root cause of water intrusion, not just the symptoms.
Protect Your Foundation from the Outside
Contact us today for a free exterior waterproofing consultation. Learn more about our interior waterproofing, crawlspace encapsulation, mold removal, and basement finishing services. Return to our homepage for more information.