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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

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

Concrete Repair
PolyLevel Concrete Lifting & Leveling
NexusPro Cracked Concrete Repair
SealantPro Concrete Sealant
Interior Slab Repair
Concrete Sidewalk Repair
Concrete Pool Deck Repair
Concrete Driveway 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. 

 

Large Waterproofing Job to Save a Living Space in Thornhill, ON

Large Waterproofing Job to Save a Living Space in Thornhill, ON

Before After
Large Waterproofing Job to Save a Living Space in Thornhill, ON Large Waterproofing Job to Save a Living Space in Thornhill, ON

A home in Thornhill, Ontario, had a basement apartment that was constantly leaking. Other companies had tried to fix the problem, but they couldn’t solve the problem. The basement was large, and there were many areas where water was seeping. 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 find a solution. Jose Martinez and the team came in and installed a full perimeter of WaterGuard® Below-Floor drainage system, ThermalDry® wall membrane, a TripleSafe™ Complete sump pump System and Window Well Ducts to take care of the problem. The Sump Pump was put into a small area in the basement to make sure it was out of the way. With the collaboration of all these waterproofing products, the basement is permanently dry. The job was done correctly, efficiently and the customer can now re-finish the basement. 

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]
HomeStars Best of 2016 Award
Clarke Basement Systems has been awarded the HomeStars Best of 2016 award which we are very proud of.... [Read more]
Readers Choice Award Winner 2015
The Community of Markham has chosen our business as the winner of the annual Markham Economist & Sun Reader’s Choice... [Read more]
More Awards

Your Trusted Thornhill, ON Basement Waterproofing & Foundation Repair Contractor

Well done - all 'round!...
Happy Customers Surrounding Thornhill, ON
Testimonials
Reviews
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Reviews From Thornhill
Testimonials From Thornhill
It's exactly what we wanted. We will definitely recommend your company. Thanks again!
Testimonial by Bethany W. 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. 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

Fast & Affordable Concrete Repair

The sunken and cracked concrete around your Thornhill home is both an eyesore and a safety hazard. It is also likely to get worse with time, but we can fix it for you!

Our experts use PolyLevel, a superior polyurethane foam to provide reliable concrete lifting & leveling solutions. Small holes are drilled in the concrete and the expansion of the foam lifts & levels the concrete. The majority of contractors you will call use mudjacking instead of foam. Mudjacking is heavier, requires larger holes in the concrete and does not last as long as PolyLevel.

If your home has cracked concrete steps, pool decks, patios, or other slabs, then NexusPro is the right solution. NexusPro repairs concrete cracks and joints and is ultra-durable, so it will withstand UV rays, extreme weather, and more.

After utilizing our expert concrete repair solutions, consider the powerful concrete sealant, SealantPro. SealantPro further protects your concrete by bonding with it to guard against oil, gasoline, liquids, and other debris. In just one coat, SealantPro extends the life of your concrete by 3 to 5 times overall. 

Call us today to learn more about our proven concrete leveling, cracked concrete repair, and concrete sealing techniques.

We Fix
  • Cracked Driveways
  • Uneven Patios
  • Sinking Sidewalks      

  • Uneven Concrete
  • Sunken Pool Decks
  • Highway & Commercial Issues
Case Studies From Thornhill
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,...
Basement
Contractor was doing a renovation for a customer who had a very wet basement. There had been a wood sub floor which had totally rotted and needed to...
Job Stories From Thornhill, ON
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
Vicinity of Romfield Circt in Thornhill
Window well caving in, window frame all rotted out.
Vicinity of in Thornhill
One small section on the north side of my house in the basement is wet.
Vicinity of Tinti Place in Thornhill
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.
Vicinity of York Hill Blvd in Thornhill
When it rains water is leaking into the basement
Vicinity of Linton Court in Thornhill
Leak in basement wall
Vicinity of Chumleigh Cres in Thornhill
Slab near side door is sloped toward house allowing water to seap into house via basement wall.
Vicinity of Woodward Avenue in Thornhill
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
Vicinity of Chumleigh Crescent in Thornhill
We have a leak coming from either a window or the east basement wall.
Vicinity of Spring Gate Blvd in Thornhill
There are areas in my garage floor that slope inwards rather than outwards causing some flooding when there is rain or snow
Vicinity of York Hill Boulevard in Thornhill
When there are continous heavy rains, we get gradually less than 100 ml of water leaking from the our wal in the basement. The cracks are are not longer than 1 foot, and they are not visible to the naked eyes. that wall has no wood structure, and is easliy accessible. We would like to have an estimate for the repair, because we would like to make the wooden structure, insulate the wall and install a drywall. thanks
Vicinity of Whitelaw Court in Thornhill
We have large concrete slabs that are recessed due to soil erosion.
Vicinity of Seabreeze Avenue in Thornhill
Seal around outside foundation is failing
Vicinity of Hoover Dr in Thornhill
Beneath the concrete basement floor, soil has settled abt 4 to 6 inches. Need to fill the void. Area size 25 x 30 feet.
Vicinity of Chumleigh Crescent in Thornhill
Crack in foundation is seeping, also a couple of small foundation rods holes are seeping as well. Crack in foundation is floor to ceiling and upper half had been previously fixed with concrete and is not leaking.
Vicinity of Swinton Cres in Thornhill
We are remodeling out home, and when gutting the basement noticed one wall was pretty Moist and so was the installation.
Vicinity of MacArthur Drive in Thornhill
Crack in foundation. Think it can be respaired from the inside. Would like to get an estimate ASAP.
Vicinity of Holsworthy Crescent in Thornhill
Retaining wall that's weak
Vicinity of Lilac Ave in Thornhill
I have a crack in the foundation that I would like an estimate for please Thank you so much
Vicinity of Brookmill Dr. in Thornhill
Vicinity of Jaimie Road in Thornhill
Are you available tomorrow to discuss a few issues we want to address to give us an estimate/estimates on options available to us re: PolyLevelâ„¢ Concrete Leveling & Lifting Structural & Foundation Repair Basement Waterproofing & Crawl Space Repair, or other. Hoping to here from you shortly.
Serving the following Thornhill, ON postal codes
L3T 0A1, L3T 0A2, L3T 0A3, L3T 0A4, L3T 0A5, L3T 0A6, L3T 0A7, L3T 0A8, L3T 0A9, L3T 0B1, L3T 0B2, L3T 0B3, L3T 0B4, L3T 0B5, L3T 0B6, L3T 0B7, L3T 0B8, L3T 0B9, L3T 0C1, L3T 0C4, L3T 0C5, L3T 0C6, L3T 0C7, L3T 0C8, L3T 0C9, L3T 0E1, L3T 0E2, L3T 0E3, L3T 0E4, L3T 0E5, L3T 0E6, L3T 0E7, L3T 1A1, L3T 1A2, L3T 1A3, L3T 1A4, L3T 1A5, L3T 1A6, L3T 1A7, L3T 1A8, L3T 1B1, L3T 1B2, L3T 1B3, L3T 1B4, L3T 1B5, L3T 1B6, L3T 1B7, L3T 1B8, L3T 1B9, L3T 1C1, L3T 1C2, L3T 1C3, L3T 1C4, L3T 1C5, L3T 1C6, L3T 1C7, L3T 1C8, L3T 1C9, L3T 1E1, L3T 1E2, L3T 1E3, L3T 1E4, L3T 1E5, L3T 1E6, L3T 1E7, L3T 1E8, L3T 1E9, L3T 1G1, L3T 1G2, L3T 1G3, L3T 1G4, L3T 1G5, L3T 1G6, L3T 1G7, L3T 1G8, L3T 1G9, L3T 1H1, L3T 1H2, L3T 1H3, L3T 1H4, L3T 1H5, L3T 1H6, L3T 1H7, L3T 1H8, L3T 1H9, L3T 1J1, L3T 1J2, L3T 1J3, L3T 1J4, L3T 1J5, L3T 1J6, L3T 1J7, L3T 1J8, L3T 1J9, L3T 1K1, L3T 1K2, L3T 1K3, L3T 1K4, L3T 1K5, L3T 1K6, L3T 1K7, L3T 1K8, L3T 1K9, L3T 1L1, L3T 1L2, L3T 1L3, L3T 1L4, L3T 1L5, L3T 1L6, L3T 1L7, L3T 1L8, L3T 1L9, L3T 1M1, L3T 1M2

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