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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

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 Alliston
Flooding in Finished Basement, Alliston ON

Flooding in Finished Basement, Alliston ON

Before After
Flooding in Finished Basement, Alliston ON Flooding in Finished Basement, Alliston ON

Jeff was in distress and called Clarke Basement Systems to get connected with our System Design Specialist, Logan Watson. His fully finished and furnished basement with two bedrooms and a laundry room had a major flood. Although he received cheaper quotes from other companies offering to solve his wet basement problems “tomorrow,” Jeff was so confident in our approach and systems that he said, “I’d rather wait for the best and only do this project once Logan.” Due to this water seepage problem, the customer lost near everything that was in the basement. From clothes to couches to beds, it was all ruined. He was planning on having his daughter move back home from college in the summer but had to put a hold on those plans quickly. Since he had significant amounts of water coming into the basement, it became like a part-time job for him to keep it from becoming an indoor swimming pool. This was affecting the customer’s daily life because instead of spending his time after work relaxing, he was mopping up water and desperately attempting to salvage whatever was left of his personal belongings. This was very frustrating for Jeff because he was looking forward to welcoming his daughter home with open arms, but instead he needed to help her find somewhere else to stay. This caused a financial burden for him also, not just to find another place for his daughter to stay, but now this unexpected cost to fix that water problem.


Once we completed this project for Jeff, he was so relieved. He was very hesitant in proceeding with the work as he was warned by friends that this was too much water for just any company to handle. He was very involved in the project from start to finish and said that by day 2 of the install he trusted our crew enough to just let them do their thing. Now, Jeff could start working on restoring his basement and in time to welcome home his daughter from college before her semester ended! He went on to write us a great review and sent Logan an email telling him to pass along the message to everyone involved in the process that we are the best contractors he has ever hired. He said, “I felt like part of the Clarke Basement Systems Family!”


Waterproofing Using ThermalDry® in Alliston, ON

Waterproofing Using ThermalDry® in Alliston, ON

Before After
Waterproofing Using ThermalDry® in Alliston, ON Waterproofing Using ThermalDry® in Alliston, ON

A basement experiencing water seepage from the floor-wall joints of their home made the area have an unpleasant smell. The homeowners were worried that mold had begun to grow and would impact their health. So they called Clarke Basement Systems, where System Design Specialist Ben Wallis described the great benefits of using our ThermalDry® wall system.

The customers decided to go with ThermalDry® as it is a fantastic option to keep the basement dry and insulated during the winter as it preserves heat. They also determined the thermal dry was a great option as they hoped to renovate one day. With ThermalDry®, they can have both waterproofed and pre-insulated walls for energy efficiency.

Crawl Space Contractors in Alliston, ON

Crawl Space Contractors in Alliston, ON

Before After
Crawl Space Contractors in Alliston, ON Crawl Space Contractors in Alliston, ON

A homeowner had contacted several companies regarding her concern with the main support beams in her basement. It appeared to her that the brick was crumbling, and she feared the worst of her basement caving in. Out of the four companies she called, CBS was the first to attend to her home for an inspection, where System Design Specialist Dean Merendino created a well-suited solution for Nicole’s home that would adequately support her home.


Installed by Foreman Don Clarke and his trusted crew, they placed our SmartJacks™ beams on both sides of the two main support beams. Following, they wrapped the bottom of the existing beams with CarbonArmour® to ensure that the posts have support. Nicole was highly pleased with the work done by Clarke Basement Systems and can now sleep well, knowing her home is properly stabilized!


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

Respected Basement Waterproofing & Concrete Repair Contractor Serving Alliston

From Logan's quotation and plan to Jose's great team (Trevor, Carlos), an enjoyable experience. Cheers to a dry basement going forward!...
Happy Customers Surrounding Alliston, ON
Work Requests

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

Reviews From Alliston
Testimonials From Alliston
I am really happy I decided to go with Clarke Basement Systems. They took care of every basement repair issue...
Testimonial by Daniel A. from Alliston, ON
Luke on installation was a real pleasure to deal with
Testimonial by Gail G. from Alliston, ON

Basement Waterproofing Experts Serving Alliston, 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 Alliston 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 Alliston 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

Fast & Affordable Concrete Repair

The sunken and cracked concrete around your Alliston 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 also offer professional installation of LintelLift to repair and support sagging, cracked garage lintels.

We Fix
  • Cracked Driveways
  • Uneven Patios
  • Sinking Sidewalks      

  • Uneven Concrete
  • Sunken Pool Decks
  • Highway & Commercial Issues
Case Studies From Alliston
Jeff from Alliston, ON, was looking forward to having his daughter home for the summer after her first year spent away at university. But,...
Nicole from Alliston ON, was very concerned with the main beam in her basement supporting the home. The bricks around it were falling apart. She...
Leaking water from the floor-wall joints of your home often means that groundwater is pooling at the side of your home. If left unattended, the water...
Job Stories From Alliston, ON
From Worried and Frustrated to Thrilled, Alliston ON

In Alliston, Ontario, a home had significant basement flooding that ruined the homeowner's belongings and tarnished the surrounding walls. The homeowner, Jeff, contacted Clarke Basement Systems to get a new working sump pump and fully encapsulate the space. He said it was like maintaining an unwanted indoor pool in the basement. Logan Watson, one of our System Design Specialists, arrived at the home to begin his multiple-point inspection. The inspection takes place inside and outside the house to determine where the water was coming from and how we could permanently fix it. Logan suggested many products, such as CleanSpace®, WaterGuard®, TripleSafe®, and IceGuard®. Our Installation team, Jose Martinez and Trevor Bowman, started the work. Jose and Trevor explained each product's function as it was installed, leaving Jeff entirely comfortable with our crew. He was thrilled with the time it took, how well everything was done, and the cleanup. Luckily he had ample time to restore the basement to its original state before his daughter came home from college. Jeff went ahead and recommended us to all his friends and loved ones. He also left us a great review saying, "From Logan's quotation and plan to Jose's great team, an enjoyable experience. Cheers to a dry basement going forward! Thank you!". From frustrated and worried to happy and part of the Clarke Basement System family!

From Worried and Frustrated to Thrilled, Alliston ON - Photo 1
Creepy Crawl Space Confrontation in Alliston, ON

Crystal K. noticed some groundwater and unpleasant odours in her crawl space. No longer wanting to deal with these unfortunate circumstances, especially with the Spring Thaw around the corner, she called Clarke Basement Systems for the best permanent solution.

One of our System Design Specialists, Robert Langton, devised a solution including the use of our patented WaterGuard® Below-Floor Drain System, CleanSpace® Wall Vapour Barrier System, SuperSump® Premier Sump Pump System, ThermalDry® R20 Wall Insulation and Drainage matting. Together, these systems were able to successfully encapsulate the space, which in turn sealed the crawl space from the earth’s moisture leading to an elimination of groundwater, bad odours and potential energy loss.

Crystal no longer has to settle for a musty, wet crawl space nor how it negatively impacts her home. Clarke Basement Systems is pleased to have been able to assist this Alliston, ON homeowner with all of her waterproofing needs.

Creepy Crawl Space Confrontation in Alliston, ON - Photo 1Creepy Crawl Space Confrontation in Alliston, ON - Photo 2Creepy Crawl Space Confrontation in Alliston, ON - Photo 3
Work Requests From Alliston, ON
Project Location: Alliston, ON
Crack in foundation on end unit of freehold townhouse.
Project Location: Alliston, ON
Have a small water leak in my basement when there is a substantial rain. Hoping to get an evaluation on whether foundation repair is necessary or if a outdoor drainage system (frenxh drain) would suffice.
Project Location: Alliston, ON
We have water that leaks through our cold storage (outside of foundational wall) and down (french?) drain in spring and heavy rainfalls, however this spring the accumulation overflowed through the rest of the basement. We plan to restore the damage, but would want the leak resolved before putting in the effort.
Project Location: Alliston, ON
Good day. After the thaw of a couple of days ago water was seen in the finished basement we have. I removed the drywall in the area I suspected the problem was and found a crack in the poured concrete foundation that was the root cause. I would like to get a quote and an understanding on timeframe to have the problem resolved. Thanks kindly, Eric
Project Location: Alliston, ON
Looks like a need a crawl space encapsulation. What is the minimum space from dirt to bottom wood you can work with?
Project Location: Alliston, ON
I have I basement crack aproximately 6ft long that does leak and 4 more that are 2 to 3 ft long, no leaks yet. it is a poured foundation aproximately 4 years old. Look forward to hearing from you.
Project Location: Alliston, ON
Two sections of the basement of my 130 year old home are dirt. Interested in the cost of encapsulating the areas.
Project Location: Alliston, ON
One room in basement has musty smell so I ripped out the almost 10 year old carpet, pad beneath and wiped cement floor with bleach solution. Some parts of cement floor were "powdery" and reddish brown so I scraped that powder off. Smell us still there so wondering how to get rid of it and also what the powder is. Thanks! Steph
Project Location: Alliston, ON
Crack in the basement foundation. Water coming in after rainfall.
Project Location: Alliston, ON
Leak in the foundation under the basement window.
Project Location: Alliston, ON
Leaking cove joint in basement
Project Location: Alliston, ON
100 year old house in Alliston. Stone foundation with cracks. House might have to be jacked up.
Project Location: Alliston, ON
Hi In preparation of finishing our basement we need to level our basement floor. However some of the issues seem to be just the slope. Not sure if your product is what I need to level this basement. Would be interested in talking with someone and possibly receiving a quote. Thx
Project Location: Alliston, ON
West foundation wall in basement leaks intermittently from various locations, including rebar holes and where wall and footing meet and others.
Project Location: Alliston, ON
Small leak in foundation
Project Location: Alliston, ON
My basement is leaking ever since the ice storm. It hasnt stopped. It is leaking where the wall meets the floor
Project Location: Alliston, ON
We have three issues that need to be addressed in our garage: (1) the garage floor needs to be lifted to bring grading to code, (2) the garage floor has sunken, (3) foundation repair from water slowly flowing into garage.
Project Location: Alliston, ON
Crack in foundation/ brick motar joints has resulted in water in basement looking for an estimate to repair.
Project Location: Alliston, ON
We have a gap letting in water where the poured concrete window ledge meets the block foundations.
Project Location: Alliston, ON
Recently bought this house (July 6th) and have had leaking in the basement. It seems to be coming from rusted metal posts in concrete foundation and other cracks.
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