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Products & Services
Basement Repair Services & Products
Basement Dehumidifiers
Basement Sealing
Basement Seepage Solutions
Basement Wall Repair
Flood Vents
Drain Tile Installation
Dry Basement Systems
Exterior Waterproofing
Flooded Basement Repair
Foundation Waterproofing
French Drain Installation
Interior Waterproofing
Leaky Basement Repair
Sump Pump Drainage
Sump Pump Installation
Sump Pump Repair
Sump Pump Battery Backup
Wet Basement Solutions
Basement Insulation
Basement Crack Repair
Basement Wall Cracks
Aspen Air Purifier


Crawl Space Repair Services & Products
Crawl Space Access Doors
Crawl Space Dehumidifier
Crawl Space Drainage
Crawl Space Encapsulation
Crawl Space Insulation
Crawl Space Liner
Crawl Space Moisture Barrier
Crawl Space Moisture Control
Crawl Space Mold Prevention
Crawl Space Sealing
Crawl Space Sump Pump
Crawl Space Vapor Barrier
Crawl Space Ventilation
Crawl Space Waterproofing
Crawl Space Excavation


Basement Remodeling
Basement Remodeling Plans
Basement Renovations
Basement Refinishing
Basement Subfloor
Basement Wall Panels
Thermaldry Basement Flooring
Basement Design
Basement Ideas
Basement Remodeling Ideas
Basement Ceiling Ideas
Basement Floor Plans
Basement Flooring Ideas


Seismic/Earthquake Retrofitting
Before and After Pictures from Cornelius
Rotting Beams in Crawlspace - Cornelius, OR

Rotting Beams in Crawlspace - Cornelius, OR

Before After
Rotting Beams in Crawlspace - Cornelius, OR Rotting Beams in Crawlspace - Cornelius, OR

By using Smartjack steel posts to replace your old wooden ones. 

Mud Caked Crawlspace and High Energy Bills - Cornelius, OR

Mud Caked Crawlspace and High Energy Bills - Cornelius, OR

Before After
Mud Caked Crawlspace and High Energy Bills - Cornelius, OR Mud Caked Crawlspace and High Energy Bills - Cornelius, OR

This home had mud caked throughout the crawlspace and high energy bills. To address this the homeowners had us do a full crawlspace insulation and encapsulation. 

Company Awards
Best of Beaverton Plumbers - 2021
The goal is to connect people with the best local experts. Expertise scored Beaverton Plumbers on more than 25 variables... [Read more]
Ten Years with Home Advisor
Currently an active member of the Homeadvisor network 10 Year anniversary of initial Screening & Approval No homeowner complaints in the last... [Read more]
Elite Service Professional
Have a minimum of five reviews with a 5-star rating Overall customer service rating of 4.5 or better No homeowner complaints in... [Read more]
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Your Proven Expert Basement Waterproofing & Crawl Space Repair Company in Cornelius, OR

Happy Customers Surrounding Cornelius, OR

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Basement Waterproofing & Crawl Space Repair in Cornelius, Oregon

Do you have water in the basement? Is your crawl space damp? This leads to mold, rot, musty odors, and structural issues. It also leads to a reoccurring headache for you. Luckily, our trained experts are available to permanently fix the problem.

We will properly install a hidden drainage system in your Cornelius basement and completely encapsulate your crawl space with CleanSpace vapor barrier. We are here to solve the problem for you.

Why Choose Us?
  • Lifetime Warranty on all Perimeter Waterproofing Systems
  • 25-year Warranty on Crawl Space Encapsulation Systems
  • Sump Pump Installation, Repair & Replacement
  • Basement, Crawl Space & Spray Foam Insulation
  • Basement Egress Windows
  • Flood Vents & Drainage Systems
  • Crawl Space & Basement Dehumidifiers
  • Crawl Space Excavation
  • Hundreds of Satisfied Customers

Basement Remodeling in Cornelius, OR

Waterproofing your basement prevents outside water from coming in but what if a pipe bursts or the water heater leaks inside the home. A newly remodeled basement done by your average contractor will mold and rot if there is an internal leak. You'll have to tear out your new basement! We fix this issue.

Our Products Include:
  • Waterproof, washable, insulated walls           
  • Mold-Resistant, No-Sag suspended ceiling
  • Modular carpet, tile & faux wood flooring

  • Energy-efficient, double-paned basement windows
  • Attractive Sunhouse basement window wells
  • French, bifold, louvre & six-paneled steel doors
Unlike the average Cornelius contractor we use completely inorganic, waterproof materials. Even if the basement floods your walls and floors will not be damaged by the water. These waterproof products are patented and are built to create an attractive basement that lasts a lifetime.

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Earthquake & Seismic Retrofitting in Cornelius

In Cornelius, earthquake risk is a reality. That is why it is critical to have your home properly reinforced and prepared for any seismic event. At John's Waterproofing, we provide seismic retrofitting services on your home or business using metal connectors and other reinforcing methods and materials. The goal is to counteract racking, sliding, and overturning, the 3 major earthquake-induced forces that can damage or ruin your structure.

For a FREE no-obligation written estimate in Cornelius, OR, please click below and John's Waterproofing will contact you shortly.

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Job Stories From Cornelius, OR
Leaky Basement Solution - Cornelius, OR

This homeowner was dismayed to find several places in their finished basement were leaking after a particularly nasty storm so they called John's Waterproofing in desperate need of help. A System Designer was sent out to the address to see what the problem was. It is not uncommon to have a previously dry basement start leaking for a number of reasons and why every homeowner in our area should waterproof their basement before finishing to protect your investment. 


The carpet, padding, drywall, and insulation all had to be removed and framing cut 32" above the ground before the crew began the job of installing the WaterGuard. WaterGuard is an award-winning piping system engineered specifically to solve basement water problems effectively and without the worry of clogging pipes from soil under the floor. Our crew installed it around the perimeter terminating it at a newly installed SuperSump Plus. It has a primary pump with a battery backup to assure continued pumping in the event of a power outage. Once the space was properly waterproofed, it was turned over to the homeowner and their contractors for finishing. 

Water in the Basement - Cornelius, OR

The homeowners had water entering their basement. The porous concrete walls were damp to the touch and it was making its way to the floorspace where the families storage items were kept. Worried about the imposing water threat to their belongings, they reached out to John's Waterproofing. 

To help with this issue we dug a trench along the interior perimeter and installed our WaterGuard system. This collects the water from the foundations surroundings and directs it a safe distance away from the home via a discharge pipe. To ensure that the water from the walls wouldn't just become a humidity in the basement causing damage we then installed a SaniDry Sedona to maintain a healthy humidity level so mold won't grow. 

CleanSpace in Cornelius, OR

Brian has a home out in Cornelius, Oregon that had a very dirty crawl space and he knew he needed to do something about it. He got the phone number for John's Waterproofing off of the internet and gave us a call. Not long after, Vincent went out to take a look and decided that the best solution for Brian was to do a full encapsulation of the crawl space eliminating any chance of dirt, debris or rodents from being able to get in. 

Ramon and Fernando were sent out to do the work and in just a few days they had the crawl space cleaned out and used the CleanSpace material to do the encapsulation. CleanSpace is an antimicrobial woven fiber that is 20 ml thick creating an airtight crawl space.

Now Brian has no worries about his crawl space and was very pleased with the work done.

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