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Products & Services
Basement Waterproofing
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


Crawl Space Repair
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 Finishing
Basement Finishing Ideas
Basement Finishing Plans
Basement Finishing Systems
Basement Flooring Systems
Basement Wall Finishing


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 Finishing Ideas
Basement Floor Plans
Basement Flooring Ideas


Seismic/Earthquake Retrofitting
Before and After Pictures from Cornelius
Be smart when it comes to your home.

Be smart when it comes to your home.

Before After
Be smart when it comes to your home. Be smart when it comes to your home.

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

Company Awards
Innovation and Excellence Award
We just got this email! We have now reviewed all of the information on the companies and individuals taking part... [Read more]
2019 Build Awards- Outstanding Service in Waterproofing
We are delighted to announce that John's Waterproofing Company are recipients within the 2019 BUILD Awards! Build Magazine's first program... [Read more]
The 2017 Impact Award
We received the Impact award this year (2017) at the annual basement system dealer’s convention. This award means so much... [Read more]
More Awards

Your Proven Expert Basement Waterproofing & Crawl Space Repair Company in Cornelius, OR

Happy Customers Surrounding Cornelius, OR
Work Requests

Click the icons to see what our customers had to say.

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 Finishing & 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 finished 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 finished basement that lasts a lifetime.

Click for a FREE Estimate!

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.

Click for a FREE Estimate!

Plumbing services & emergency repairs

Does your home have dirty drains, a clogged toilet, a burst pipe, or other plumbing issues? John's Waterproofing can help with these issues and more. We offer fast and efficient plumbing solutions.

Our plumbing services:
  • Emergency repair & pump-out services
  • Residential plumbing
  • Drain cleaning
  • Sump pumps & sewer ejection pumps
  • Frozen & burst pipe repairs
  • Kitchen, bathroom & laundry plumbing
  • Boiler installation & replacement

We proudly serve Cornelius, OR and areas nearby. Schedule a free plumbing repair estimate to learn more.

Job Stories From Cornelius, OR
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.

Work Requests From Cornelius, OR
Vicinity of NW Roy in Cornelius
Water in Crawl space
Vicinity of SW Firdale Road in Cornelius
Poor vapor barrier in crawl space
Vicinity of in Cornelius
We have a duplex with water in the crawl space and will need a drainage system installed.
Vicinity of in Cornelius
Crawl space water build up
Vicinity of in Cornelius
Hi! I am the listing agent for this property and we had some foundation issues that came up on the repair addendum. I need your opinion to see if you think there are issues and what it would take to repair. Thanks!
Vicinity of in Cornelius
Crawlspace insulation
Vicinity of S Linden St in Cornelius
Some dry rot found on home inspection in crawl space floor joist and sill plate area
Vicinity of in Cornelius
Musty smell in the house all the time, particularly in winter. Excessive living space humidity also particularly in the winter. Evidence of standing water on the old "vapor barrier". I'm sure this is not a unique message left in this field. ;-) Looking into new vapor barrier that really blocks vapor but would also like to know about insulation as well.
Vicinity of N Holladay St in Cornelius
Hello. I need an estimate for fixing standing water in my crawlspace. Thanks.
Vicinity of SW Blooming Fern Hill Road in Cornelius
Basement concrete walls leaking.
Vicinity of S Jasper Ct in Cornelius
I recently purchased a home, and the inspection report revealed that there was some fallen duct work (sitting on the ground instead of attached to beams) and a little bit of fallen/missing insulation as well. There is no rot, or standing water anywhere - only evidence that animals have been down in there. I'd like a ballpark estimate for what a small cleanup job would be for a crawlspace of a 1400 sq ft home, to rehang a little insulation, re-attach a fallen stretch of ducting, and re-screen/re-seal the vents that lead from under the house to the outside, so I don't have any guests under there this fall/winter. Email is the best way to get a hold of me 8a-5p, Mon-Fri. Thanks, Dan
Vicinity of in Cornelius
I have a very Musty smell coming from my crawl space. it is very damp looking. I am concerned about the possibility of mold.
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