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Products & Services

Mold Services
Dust Mites Control
Mold Spores
Mold Prevention
Dry Rot & Brown Rot

Basement Repair Services & Products
WaterGuard Interior System
DryTrak Drainage Channel
TrenchDrain Drain Grate
IceGuard Discharge Line
FlexiSpan Wall Crack Repair
Polyurethane Crack Sealing
WellDuct Window Drainage
BrightWall Waterproof Panels
ThermalDry Wall Barrier
Basement to Beautiful Pre-Finishing Wall Insulation Panels
Drain Tile Installation
SuperSump Pump System
TripleSafe Pumping System
UltraSump Battery Back Up
SaniDry Dehumidifier

Aspen Air Filter

Crawl Space Repair Services & Products
CleanSpace Encapsulation Vapour Barriers and Liners
Turtl Access Hatch
EverLast Crawl Space Doors
SaniDry CSB Dehumidifier
SmartDrain Water Drainage
SilverGlo Wall Insulation
TerraBlock Floor Insulation
SmartSump Sump Pump
WallCap Block Wall Sealer
SmartVent Flood Vents

Foundation Repair Services & Products
Push Pier Underpinning for Settlement, Foundation Leveling, Sinking Foundation Repair
Structural Repair
Geo-Lock Wall Anchors
Geo-Lock Helical Anchors
PowerBrace Bowed Wall Repair
CarbonArmor Fiber Wall Repair
SmartJack Crawl Space Support
Slab Pier Repair
ShotCrete Wall Restoration
LintelLift Garage Lintel Repair

Before and After Pictures from Thornhill
Multiple Cracks in Wall Foundation in Thornhill, ON

Multiple Cracks in Wall Foundation in Thornhill, ON

Before After
Multiple Cracks in Wall Foundation in Thornhill, ON Multiple Cracks in Wall Foundation in Thornhill, ON

A home in Thornhill, Ontario had a wall foundation with multiple cracks in it. There was water seeping through the cracks causing the floor to be wet. The customer had previous plumbing problems and was tired of seeing water in their home. They wanted a dry basement and did not want to worry about water entry constantly.

The customer called Clarke Basement Systems and talked to Chris Luke, who explained everything. Mark Dougherty and the team came in and installed FlexiSpan® wall crack repair on the cracks and then installed CleanSpace® over the top for extra protection. The patented Flexispan wall crack repair system has a 25-year warranty. They also installed a drainage system on the floor, below the cracked area to collect any water that tries to seep through. Now the basement is dry, and the customer can rest easy. 

 

New Renovated Home Faces Water Behind Basement Walls, Thornhill ON

New Renovated Home Faces Water Behind Basement Walls, Thornhill ON

Before After
New Renovated Home Faces Water Behind Basement Walls, Thornhill ON New Renovated Home Faces Water Behind Basement Walls, Thornhill ON

In Thornhill, Ontario, this newly renovated home had experienced water coming from their basement corner. The studs and insulation were mouldy after the homeowner removed some of the drywall. He contacted Clarke Basement Systems to get a professional opinion and solution. Our Sales Manager, Jeff Fraser, investigated the leak and concluded 3 products to ensure the basement is dry, draining water effectively, and insulated. He explained each product to the client, which helped him visualize what would be done to his home. Products being: WaterGuard®, R20 Insulation, and CleanSpace®. Our installation foreman, Jose Martinez, and Specialist, Trevor Bowman, began the work efficiently yet organized. The homeowner checked in occasionally and was impressed by the craftsmanship. After all was said and done, it was time to walk our client through the work. He was familiar with our systems based on our videos and website material but was still interested in how it worked. From concerned to happiness, our client could enjoy that side of the basement again. 

Two Cracks Fixed With FlexiSpan®, Thornhill, ON

Two Cracks Fixed With FlexiSpan®, Thornhill, ON

Before After
Two Cracks Fixed With FlexiSpan®, Thornhill, ON Two Cracks Fixed With FlexiSpan®, Thornhill, ON

Wall cracks can happen anytime, no matter how old or new the home is. This home in Thornhill, Ontario, had a wall crack in the cellar that ran behind all of their shelving and started to destroy all stored goods. This was not the first time a repair had been done in the cellar, but they wanted to resolve it professionally, so Clarke Basement Systems was their go-to. 

 

Our System Design Specialist, Ben Wallis, went to the home knowing what products needed to be used to fix this issue permanently. He recommended our FlexiSpan® wall crack repair system that keeps all leaky water behind the wall and directs it to the footing, where we install a drain underneath the basement floor. Alan Murphy, our Installation Specialist, went to the home and began the work. Prepping the area included cleaning debris and removing the shelving to be able to access the wall crack. Once everything was all set, it was time to seal off the crack. As Alan was installing our FlexiSpan®, he noticed that the crack split off into the corner and raised concerns that it could be a problem later on. He ended up carefully repairing two cracks instead of one. The homeowner was impressed with Alan’s attentiveness to details presented in this job and the clean, polished finished look. No remaining stressors for this cellar! 

Company Awards
Best of 2019 Homestars Award
Hailed as HomeStars' highest honour, the Best of Awards, presented by DEWALT, Canadian Contractor and RenoRun, recognizes the most trusted... [Read more]
More Awards

Basement Waterproofing & Foundation Repair Company in Thornhill, ON

It's exactly what we wanted.  We will definitely recommend your company. Thanks again!      ...
Happy Customers Surrounding Thornhill, ON
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Reviews From Thornhill
Testimonials From Thornhill
Quality of work is very good. This is the second time I used Clark systems and would recommend it to anyone...
Testimonial by Leon K. from Thronhill, ON
Choose Clarke For whatever work you need. They are the best.
Testimonial by Sheryl C. from Thornhill, ON

Basement Waterproofing Experts Serving Thornhill, ON

Water in the basement or crawl space leads to mold, rot, musty odors, and structural issues. It also leads to a reoccurring headache for you. Luckily, Clarke Basement Systems has a team of trained experts that are available to permanently fix the problem.

We will properly install a hidden drainage system in your Thornhill 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
  • Crawl Space & Basement Dehumidifiers
  • Hundreds of Satisfied Customers

Foundation Crack Repair Contractor

Foundation repair problems destroy your Thornhill home’s value and can be dangerous. Our in-house team of structural and geo-technical engineers are here to help. We design and install the right solution and usually have the project finished in less than a week. You will have peace of mind as we provide a 25-year written warranty against defects on our foundation products.

We Fix
  • Bowing Walls
  • Sagging Floors
  • Stair-Step Cracks
  • Tilting Chimneys  
  • Foundation Cracks
  • Garage Slabs   
We Use
  • Wall Anchors
  • Slab Piers
  • I-Beam Wall Braces
  • Helical Deck Piers
  • Underpinning

 

Crawl Space Vapor Barrier Encapsulation Experts

Crawl space encapsulation is the best way to eliminate musty odors, mold, moisture and mildew from under your house. Clarke Basement Systems has a team of dedicated crawl space encapsulation experts with decades of experience and warrantied products. Our patented crawl space vapor barriers provide a dependable moisture barrier that is guaranteed to last 25 years. Trust our crawl space encapsulation team to permanently fix your leaky or damp crawl space. Our crawl space encapsulation services are proven, dependable and warrantied. Call or click today to schedule your FREE crawl space encapsulation estimate!

Benefits of our Crawl Space Vapor Barriers:

  • Seal Out Cold Air, Humid Air & Moisture
  • Prevent Crawl Space Leaks
  • Improve Energy Efficiency
  • Durable Crawl Space Vapor Barrier Material with 25-year Warranty
Case Studies From Thornhill
Water
In Thornhill, Ontario, a newly renovated home on the block had water from the drywall. The homeowner was initially confused about where it was coming...
Soaking
In Vaughan, Ontario, a home's basement floor started to get wet during rainy days which confused the homeowmners wondering where the water was coming...
Damp
A basement is more than just a space to store things and forget about them. It can be an integral part of our home, offering an area to entertain,...
Job Stories From Thornhill, ON
Wall Crack Repair to Keep This Basement Permanently Dry, Vaughan Ontario

In Vaughan, Ontario, a wall crack had formed in the basement from the constant rainfall, resulting in an incredible amount of water entering the house. The homeowners were concerned about it causing more damage inside their basement. They contemplated doing the work themselves but noticed that the crack had formed outside too. They contacted the experts at Clarke Basement Systems for a professional opinion. Our System Design Specialist, Chris Luke, went to the home and did a complete inspection. At first glance, he knew that it was a job for our FlexiSpan® Wall Crack Repair System – it blocks off the water from entering the basement with a single-celled foam strip that covers the crack to absorb water and direct it down to a drain underneath the floor. Our service technician, Ali Fereidouni, installed the system in a few steps:

  • He started with jackhammering the area creating a pit for water to flow to if needed
  • Next, he filled the pit with gravel and cactus board 
  • Ali removed debris and dust so the Flexi Caulking could stick and cure effectively
  • Next, he installed foam and pressed in the sealant
  • The pit was finished with fresh concrete at the footing of the wall

Ali walked the homeowners through the installation – explained the curing process, the material used, and how the system works. The homeowners were excited about the entire service, from the initial call all the way to the final result.

Wall Crack Repair to Keep This Basement Permanently Dry, Vaughan Ontario - Photo 1
Cellar Had an Extra Hidden Crack! Thornhill, ON

In Thornhill, ON, a cellar had a leak that caused the homeowners to remove all their stored belongings, fearing that the space would flood and the wooden shelves would collapse. They called the pros Clarke Basement Systems to save this space once and for all. Once everything was quoted and finalized, it was time to get to work. Our Installation Specialist, Alan Murphy, came to the rescue. The best way to tackle the cracks is to remove the shelving. When he finished the removal, he noticed that the crack split off towards the corner of the wall making it two. The repair system he used was our FlexiSpan®. FlexiSpan® uses a blend of our Flexi Caulk and a foam strip applied directly to the crack. A layer of caulking goes on both sides of the gap, not covering it. From there, Alan uses the foam, which will cling to the first application, catch any water, and direct it to the footing of the wall. Finally, another layer is coated on top to secure the work. The base of the wall is a water deposit and has our WaterGuard® attached, so any existing water goes behind the FlexiSpan® and out of sight. Alan was meticulous yet efficient, making this job quick and easy. The wife came downstairs and was very impressed with the work and the attention to the second hidden crack. 

Cellar Had an Extra Hidden Crack! Thornhill, ON - Photo 1
Fixing a Leaking Crack in Thornhill, ON

Michael K. noticed that there was a leaking crack in the foundation of his home, resulting in a wet basement. The leak began to damage the drywall and flooring in Michael’s finished basement. To prevent any further damage to his home and fix the existing issue, Michael contacted Clarke Basement Systems.

The solution for this wet basement as proposed by our System Design Specialist Ron Monk included the installation of our patented FlexiSpan® Wall Crack Repair System. It seals the crack keeping the basement dry. A 25-year warranty backs our FlexiSpan®.

Michael K. can enjoy his finished basement once again without worrying about water damage to the foundation or furnishings. Clarke Basement Systems is pleased to have been able to help this Thornhill, ON homeowner with all of his waterproofing needs.

Fixing a Leaking Crack in Thornhill, ON - Photo 1Fixing a Leaking Crack in Thornhill, ON - Photo 2Fixing a Leaking Crack in Thornhill, ON - Photo 3
Large Waterproofing Job to Save a Living Space, Thornhill, ON

A home in Thornhill, Ontario, had a basement apartment that was constantly leaking. Other companies had tried to fix the problem in the past, but they couldn’t solve the problem. The water was seeping up through the basement floor in numerous locations throughout the basement. The basement was a living space that generates revenue for the homeowner, and the space was un-liveable. The tenant moved out due to the problem.

The customer contacted Clarke Basement Systems to fix the problem. Jose Martinez and the team came in and installed a full perimeter of WaterGuard drainage system, ThermalDry wall membrane, a TripleSafe sump pump and Window Well Ducts to take care of the problem PERMANENTLY. The ThermalDry wall membrane, collects any seepage and moisture and directs it into the WaterGuard. The WaterGuard directs the water into the TripleSafe Sump Pump and out away from the home. The job was done properly, efficiently and in a timely manner.Th customer can now re-finish the basement and it can again generate revenue for owners. 

Large Waterproofing Job to Save a Living Space, Thornhill, ON - Photo 1Large Waterproofing Job to Save a Living Space, Thornhill, ON - Photo 2Large Waterproofing Job to Save a Living Space, Thornhill, ON - Photo 3Large Waterproofing Job to Save a Living Space, Thornhill, ON - Photo 4
Multiple Cracks in Wall Foundation, Thornhill, ON

A home in Thornhill, Ontario had a poured wall foundation with multiple cracks in it. This was causing the floor to be wet. The customer had previous plumbing problems and was tired of water. They wanted a dry basement and did not want to constantly worry about water entry.

The customer called Clarke Basement Systems and talked to the inspector Chris Luke, who explained the simple process of what would be done. Mark Dougherty and the team came in and installed Flexispan wall crack repair On the crack and then installed Clean space over top for extra protection. The patented Flexispan wall crack repair system has a 25 year warranty. They installed a drainage system in the floor below the crack to collect any water that tries to seep through. Now the basement is dry and the customer can rest easy. 

 

 

Multiple Cracks in Wall Foundation, Thornhill, ON - Photo 1
Work Requests From Thornhill, ON
Project Location: Thornhill, ON
We have water coming in through the basement wall. Today's storm made it more noticable but it's been a problem for a while. Hardword flooring in basement has been slowly compromised over the last couple of years Would like a quote to repair
Project Location: Thornhill, ON
We have some leaking (wet spots) appearing in one room in our basement. We inspected the side of the house and there is a small crack in the foundation outside which we believe to be the culprit. We want to understand what is involved to fix it. Costs? Timeframes and is this something we can attend to now or have to wait until spring? In any every would welcome and estimate
Project Location: Thornhill, ON
Leak in a cold room
Project Location: Thornhill, ON
Want to get a quote on leveling stamped concrete patio and foundation repair.
Project Location: Thornhill, ON
Hi, we have a small cold room in the basement and would like to know price range for and water proofing service.
Project Location: Thornhill, ON
I have a sinking concrete issue in my garage. There is a new crack and ground water is seeping in.
Project Location: Thornhill, ON
The post holding up 2nd floor room seems to be shifting. Also could I get a quite on concert levelling for my garage floor.
Project Location: Thornhill, ON
I have basement leaks and Mold.
Project Location: Thornhill, ON
My concrete pool deck has cracks and a couple of sinking slabs in need of repair
Project Location: Thornhill, ON
There is a leak in the unfinished part of my basement.
Project Location: Thornhill, ON
My garage floor has significant cracking and is not level in certain places. I would like an estimate for repairing the floor.
Project Location: Thornhill, ON
Concrete levelling
Project Location: Thornhill, ON
BS"D Hello. Had a soaking wet floor in the basement. Found a small crack outside in the foundation then opened the wall inside and found same crack. I think water is coming in from there. Would like a quote to fix. Ty
Project Location: Thornhill, ON
Window well caving in, window frame all rotted out.
Project Location: Thornhill, ON
One small section on the north side of my house in the basement is wet.
Project Location: Thornhill, ON
We have a leaky basement. I was wondering if someone could come take a look to advise what can be done and at what cost. You can reach me at 416.553.1500. We can be available to meet with your estimator any day. Thanks.
Project Location: Thornhill, ON
When it rains water is leaking into the basement
Project Location: Thornhill, ON
Leak in basement wall
Project Location: Thornhill, ON
Slab near side door is sloped toward house allowing water to seap into house via basement wall.
Project Location: Thornhill, ON
We are replacing our basement windows, and will need two new wells. We are interested in the SunHouse window wells that we see on your website, but need some idea of the cost to have two of these installed. Thanks, Joe
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