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A free, no-obligation visit and a detailed written estimate before any work begins. No pressure to commit.
Serving Bangor, Hermon & Central Maine
Exterior Waterproofing & French Drains in Bangor, ME
French drains and downspout drainage that stop groundwater and roof runoff before they reach your foundation.
- 5.0 · 27 Google reviews
- Licensed & insured
- BPI · IICRC · MICRO certified
- Efficiency Maine partner
- 20+ years experience
- 500+ projects completed
Offers & financing
Payment options
Financing available
Financing options help make larger projects affordable. Ask about current terms when you book your estimate.
French Drain Systems & Downspout Drainage
Water pooling near your foundation is one of the most common — and most preventable — causes of basement moisture, foundation damage, and crawlspace problems. We install exterior French drain systems that intercept groundwater and surface runoff before it reaches your home, and connect downspouts to gutter systems to redirect roof runoff away from the foundation.
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 water problems around your home rather than just treating the symptoms.
French Drain Installation
Perforated pipe in a gravel bed, properly sloped to move water away from your foundation by gravity.
Downspout Attachment & Drainage
We connect downspouts to your gutter system and run underground lines to carry roof runoff away from the house.
Proper Discharge Points
Every system connects to a discharge point — pop-up emitters, dry wells, or daylight outlets — so water exits safely away from the home.
Foundation Crack Repair & Foundation Sealing
Water already coming through a cracked wall? We seal leaking foundation cracks from the inside so the repair bonds through the full wall thickness, and seal block and stone walls with dimple board and a perimeter drain. Pair it with exterior drainage to take the water pressure off the wall.
Our Exterior Drainage Services
We specialize in French drain systems and downspout drainage — the two most effective ways to keep water away from your foundation. 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 through properly sloped drainage pipe and washed stone aggregate.
- High-flow corrugated drainage pipe
- Washed stone aggregate for maximum flow
- Filter fabric to prevent clogging
- Proper slope for gravity-fed drainage
- Connected to a discharge point away from the home
Downspout & Gutter Drainage Solutions
Roof runoff is one of the biggest sources of foundation water problems. We attach downspouts to gutter systems and connect them to underground drainage lines that carry water far away from your foundation walls, preventing pooling and erosion near the foundation.
- Downspout attachment to gutter systems
- Underground downspout extensions
- Pop-up emitter discharge points
- Seamless integration with French drains
- Prevents erosion and pooling near foundation
How It Works
Every project starts with a free assessment so we can recommend the right solution for your property.
01
Free On-Site Assessment
We evaluate your property, identify where water is entering or pooling, and determine the best drainage solution for your specific situation.
02
Install French Drain System
We trench along the problem areas, lay perforated drainage pipe in a bed of washed stone, wrap it in filter fabric, and backfill. The system is sloped to move water by gravity.
03
Connect Downspout Drainage
If roof runoff is contributing to the problem, we attach downspouts to your gutter system and connect them to underground drainage lines tied into the French drain or a separate discharge point.
04
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.
Benefits of Exterior Drainage
A properly installed French drain system protects your home for years to come.
Prevents Foundation Water Damage
Intercepts groundwater and surface runoff before it can reach your foundation walls or seep into your basement.
Eliminates Standing Water
Removes water that pools in your yard, near walkways, or around your foundation after heavy rain or snowmelt.
Protects Against Freeze-Thaw
Keeps water away from foundation walls so it cannot freeze, expand, and crack the concrete during Maine winters.
Increases Property Value
A dry foundation with proper drainage is a major selling point and protects your largest investment.
Low Maintenance Solution
Once installed, a properly built French drain system works quietly for years with minimal upkeep required.
What does exterior waterproofing cost in Maine?
$3,000–$12,000
Typical range
Typical for an exterior French drain with downspout tie-ins and a discharge point on a Central Maine lot. Trench length, depth, soil, and how far the water has to travel to daylight or a dry well move the price.
Every job starts with a free, no-obligation estimate. You get the exact price in writing before any work begins.
Why Central Maine homeowners choose Nason's
Long-term solutions, not quick fixes
We fix the cause, not just the symptom. Water, mold and heat loss get traced to the source so the problem stays solved.
Transparent, written estimates
A free on-site visit and a detailed written estimate with no pressure to commit. The price you see is the price you pay.
Certified, local crew
BPI, IICRC and MICRO certified professionals working from our Hermon office, with 20+ years of experience and 500+ completed projects across Central Maine.
What our customers say
5.0 rating · 27 Google reviews
Nate Curtis
January 2026 · Google
“I've used Nick for all of my insulation and waterproofing needs and he's never failed me. Always on time, always polite, always a good price. I have nothing but amazing things to say about him and his team. We recently got our house re-insulated and it cut more than half of our heating bill.”
Todd Hanlon
August 2024 · Google
“I highly recommend Nick and Nason's home solutions! I hired Nick and his Team to tackle a difficult mold and water remediation project in our historic home in mid-coast Maine. Nick's customer service, attention to detail, and quality of work was outstanding.”
Linda Scrofano
August 2024 · Google
“We contacted Nick to discuss a serious foundation issue and a mold issue with a property we intended to purchase. Nick came out to look at the issues within just a couple of days and provided us with a comprehensive estimate and discussed the details of the proposed repair with me. He also answered some questions I had with mold in another area of the house. The quote is extremely reasonable for the work to be done.”
Exterior waterproofing questions from Bangor-area homeowners
What is a French drain?
A trench with perforated pipe in washed stone, wrapped in filter fabric and sloped to carry groundwater away by gravity. It intercepts water before it reaches the foundation wall instead of catching it inside the basement.
Exterior or interior waterproofing: which do I need?
If water pools in the yard or against the foundation after rain, exterior drainage fixes the cause. If water comes up through the floor or the water table is high, an interior drain and sump pump is usually the better value. Many homes need both.
Do downspouts really cause basement leaks?
Roof runoff is one of the biggest sources of foundation water. One inch of rain on an average roof is well over a thousand gallons dumped beside the wall. We connect downspouts to underground lines that discharge well away from the house.
Where does the water discharge?
To a pop-up emitter, dry well or daylight outlet downhill from the house, chosen for your lot. The line is sloped so it drains fully and does not freeze in a Maine winter.
How long does an exterior drainage installation take?
Most residential French drain and downspout projects in the Bangor area are completed in one to three days, depending on trench length and access.
Will you damage my landscaping?
Trenching disturbs the strip we dig, and we backfill and grade it when we are done. We plan the route around trees, walkways and utilities during the free on-site assessment.
Related services in Bangor & Central Maine
More home performance services and towns we serve
Most homes need more than one fix. Alongside this, we offer foundation crack repair, crawl space encapsulation, basement finishing, spray foam and blown-in insulation, air sealing, BPI energy audits, mold removal and remediation, interior basement waterproofing and sump pump installation.
Our service area runs from the Penobscot valley to the coast and the North Woods: Dexter, Dover-Foxcroft, Greenville, Millinocket, Lincoln, Bangor, Hampden, Old Town, Orono, Hermon, Holden, Brewer, Ellsworth, Bar Harbor, Belfast, Waterville and Newport.
If you want to understand the building science first, start with Why Insulation and Air Sealing Are the Best Energy Investments for Your Maine Home, 5 Warning Signs Your Crawlspace Is Costing You Money and Mold in Maine Homes: What Every Homeowner Needs to Know.
You can also see all of our services, the full list of towns we serve, our certifications and team, answers to common questions, our home performance blog, how to book a free assessment, privacy policy and terms of service.
Get a free estimate in Bangor, ME
Tell us about your exterior waterproofing project. We reply with a time for a free on-site visit.
Need it today?Call (207) 291-6558