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Basement Waterproofing Toronto & GTA

Not your Average Waterproofers, Toronto's Best

Welcome to Aquamaster. If you are looking for a job done right, you've come to the right place. 

Built to Last for Decades

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Why you Need Basement Waterproofing Services?

Welcome to Aquamaster

Have you discovered evidence of water damage in your basement? Basement waterproofing is the solution whether you are buying or selling a property or just want to fix your home. We resolve all types of damp basement issues such as leaks, humidity, and musty odors to provide you with a dry and healthy basement. If you have recurring issues with leaking walls, seepage through the flooring, or cracks in the foundation of your home, you need a solution that will keep your basement dry all the time. You may want to consider either exterior or interior basement waterproofing.

Aquamaster Drain Plumbing & Waterproofing Inc. does more than just fix your wet basement problem. Our proven basement waterproofing process makes sure that your basement does not leak ever again. We do not make guesses about your leaks; our system is based on expertise and quality craftsmanship. We have more than 20 years of industry experience and more than 3,000 satisfied customers. We treat all of our customers as individuals and all of our work is fully guaranteed. We are the #1 trusted basement waterproofing Toronto company.

How Basement Waterproofing Works

Why Choose External Basement Waterproofing?

External waterproofing is the ideal solution to stem water damage, or to prevent excess water from getting past the foundation into the basement. However, external waterproofing does cause disruption to the outside of the home. The soil and underlying gravel have to be removed in order to get a close look at defects on the outside of the foundation.

Power washing and then power drying the foundation walls is the best way to detect hairline cracks or fissures. Once the problem areas are uncovered, then each problem is handled separately. A flexible, cement sealant is applied to all the exposed areas of the foundation, which adds extra support and protection to the concrete foundation by strengthening the existing walls. Then a heavy polyurethane drainage mat is attached to the exposed walls. This extra protection on the outside ensures the foundation will ward off any excess buildup of groundwater.

Outside drainage is another part of the waterproofing solution. Many homes still have the old-fashioned clay weeping tiles, which degrade and clog over time. Outdated drainage pipes are replaced with modern weeping tiles, which are made of plastic and perforated so they don’t clog as easily. Done correctly, external waterproofing will keep the foundation and basement watertight for decades.

We are going to demonstrate the best practices of basement waterproofing that have been tested, proven and working for many years for all our clients. We are not talking about magic waterproof paints, channel drain tiles that sit on top of the footing, molding drainage system and e.c. None of them completely, and more important properly solve the wet basement issue. Most of the waterproofing systems have been designed for easy installation, and not for how well they will perform. That little box of tricks doesn’t take you very far. In fact, it sometimes takes you nowhere. The real best practice isn’t a particular product at all. It is a well-defined series of steps that conduct to effectively performing system.

The Aquamaster’s approach is significantly different from quick fixes. It’s not based on guesswork, and it doesn’t have the excitement and appeal of magic products. Our solid knowledge, craft, skill, and expertise prove that it always works.

How Basement Waterproofing Works?

Basement Waterproofing - Process & What to Expect

Basement Schema

Step 1: Identify Problems, Define Long-Term goals & Measure your Budget 

  • We need to find out (not guess) which parts of your foundation are underperforming. We need to clearly define the problem in order to assign the appropriate solution.

  • After a detailed analysis of the problem, we will come up with a proper solution that fits your budget.

  • You will clearly know how much money you’re going to spend now, and possibly in the future.

We try to stay away from quick fixes and prefer to address the problem at its roots. It is more expensive, but you pay once – guaranteed. If however, you want a quick fix – we will help you. Although you do need to realize that it is only a temporary solution which won’t last long and the possibility of spending again in the future is huge.

Step 2: Understand the Hydrostatic Pressure & Foundation Drainage

Basements leak for various reasons, some of them are easy to identify and some are not. When it rains or snow melts lots of water travels against the foundation wall, and without proper waterproofing, it quickly penetrates into the basement through foundation defects like cracks, tie-rod holes and others, as shown in the picture below. Also, the underground water table rises and creates hydrostatic pressure that forces water up through the basement floor. That is when weeping tile comes into action. Installed next to the footing it relieves hydrostatic pressure and controls the water table level. This is the reason why it is very important that weeping tile remains clean and free of dirt and tree roots.

Old-style weeping tiles are pieces of clay pipe aligned together with gaps in between; these gaps are entry points for water, but as water travels down through the soil it picks up sand, sediment, and mud, which over time block the pipes. That is why we recommend using modern weeping tile, which is a perforated, corrugated plastic tube with a cloth filter. Its design prevents weeping tile tubes from getting blocked plus it absorbs much more water in shorter periods of time.

What are the Types of Foundations, their Strengths & Weaknesses
There are 4 primary foundations: poured concrete, masonry, stone, and concrete blocks. Each foundation has its core strengths and weaknesses. The type of foundation determines the methodology and materials to be used. Once the system is analyzed, strengths and weaknesses are assessed, and water entry points are identified, we are ready to focus on repair solutions.

Internal vs External Basement Waterproofing

Step 3 - How to Choose the Right Waterproofing System?


Internal Basement Waterproofing

Although interior water drainage is not technically waterproofing, it is a working technique in mitigating basement water. This technique involves removing a section of the basement concrete floor, usually about a foot wide, along the foundation wall. Then a trench is dug out where weeping tile is placed and drainage membrane is installed on the foundation wall.

After that was done, the trench is backfilled with 3/4 grovel and new concrete is poured over it. Interior water drainage functions by draining underground water from underneath the basement floor and alongside the foundation footers. It then channels the water with a weeping tile pipe to a sump pump system, which will then pump the water from the basement outside. Wall conduits such as dimple boards or other membranes are fastened to the foundation wall and extended over the new drainage to guide any moisture down into the system.


  • Cleaning the Walls - We power wash the walls and then dry them up using a propane torch. After that foundation walls are inspected for cracks, holes openings and are fixed with hydraulic cement. Cleaning the walls is a very important step; it is impossible to pinpoint all defects without it, also foundation sealant that is used after won’t stick properly and as a result the entire waterproofing system will eventually fail.


External Basement Waterproofing - How it Works

As mentioned above the materials and methodology will depend on many factors. Herein is described a process of basement waterproofing for a house with poured concrete foundation.
This process consists of well-defined series of steps. 


  • Site Preparation - plants are removed to plastic containers with topsoil while the waterproofing process takes place. The job area is protected with sheets of plywood, plastic tarps and “caution” signs. 

  • Excavation - The process requires excavating soil along the foundation wall 4” below the top of the footing. Why exactly 4” you may ask? That is because the diameter of weeping tile that will be later placed along the footing is 4”. Once excavation is done and old weeping tiles are out, we start treating the foundation walls.

  • Cleaning the Walls - we power wash the walls and then dry them up using a propane torch. After that foundation walls are inspected for cracks, holes, and openings and are fixed with hydraulic cement. Cleaning the walls is a very important step; it is impossible to pinpoint all defects without it, also foundation sealant that is used after won’t stick properly and as a result, the entire waterproofing system will eventually fail.

  • Sealing - We now begin the sealing process that is exclusive to Aquamaster Drain Plumbing & Waterproofing Inc. Our first layer of protection is a cement based sealant. This material strengthens and hardens concrete walls by closing its pores. Then we apply a coating of elastomeric waterproofing membrane (polymer-modified asphalt).

    In contrary to the black tar this rubberized asphalt membrane is formulated to stay pliable. The great advantage of it is that even if new cracks occur – the elastomeric membrane will simply stretch and will continue to perform. Black tar has no flexibility at all and will crack with any foundation movement. Also, black tar is rated as a damp-proofing not a waterproofing, it will slow down the penetration of water while elastomeric will prevent the penetration completely. Unfortunately, most home builders are still damp-proofing rather than waterproofing their foundations.

    For our final layer of protection, we install a heavy gauge polyethylene dimpled drainage mat to the foundation wall using specially designed fasteners. This material does not tear providing reliable protection for the elastomeric membrane. The dimples create an air gap, so if moisture gets behind it, it quickly channels to the drain tile.


  • New Footing Tile Installation - We install the new perforated weeping tile with the “SOCK” filter on it. Cleanouts are installed to provide access to the weeping tile pipe. Then we disconnect downspout pipes which will ensure that leaves and stones from the roof will not block the weeping tile, reducing the risk of flooding in the basement. You may also be eligible for rebates from the city of Toronto for doing that.

  • Backfill - Then we cover weeping tile with 3/4 gravel 16” on top. Many companies will use plywood to cut the trench in half. They will gravel on the house side of the wood and fill the other side with the excavated dirt. We fill the entire trench with river-washed gravel as opposed to the less expensive limestone that most waterproofing contractors use. Limestone compacts limit drainage. After that had been done we start backfilling with previously excavated soil, constantly tamping it down during this process, as the result – minimum soil settling.

  • Landscaping -  Finally, the landscaping is restored. We use premium topsoil when replanting previously removed plants. Aquamaster Drain Plumbing & Waterproofing Inc takes great effort in protecting your yard and landscaping during the process. All equipment is run on plywood, so damage is minimal. Often times it is hard to tell that we were ever on your property.

    The work is complete now and you have a piece of mind that it was done properly the best possible way. Proper waterproofing is a complex process. Few companies accomplish this in a timely manner, with minimal damage to the property, and little or no inconvenience to their customers. A superior attitude produces superior results.

Why Choose Us?

3,000+ Happy Clients Chose Aquamaster


True Warranty Coverage

Work, meterial and labour for 25 years. Fully transferable from owner to owner.

24-Hour Emergency

Our emergency team is available 24 hours a day.


Licensed & Insured

Aquamaster team is fully licensed & insured to work in plumbing, concrete, underpinning and waterproofing.



We offer all our clients 10% Off their first Aquamaster service. Get the offer today!

In Business Since 2009


We've been around for a while. We will be around for a lot longer!

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Proudly Serving South Ontario

Aquamaster team is proudly serving multiple locations in Toronto, GTA and multiple locations in Sothern Ontario.


Best Materials

We always choose high quality materials because we want to provide high quality service. 


Peace of Mind

Our service is well-thought through, so you don't have to worry about it!

Don't Take Our Word for It!

What Our Clients Say?


Stephanie G.

Residential Client

I used Aquamaster for two separate home waterproofing projects and I was extremely satasified with their work and price. Their team are highly skilled, thorough and were able to complete the 10.5 hour job in one day. They were even kind enough to seal my window frame after I noticed a minor leak. I would highly recommend Aquamaster for all your waterproofing and plumbing needs.

The Aquamaster team is absolutely fantastic! They went above and beyond to diagnose and correct the problem that I had with my basement plumbing caused by old pipes and persistent tree roots. I used them once in 2012 and in 2020. I cannot say enough good things about this team - Highly recommend.


Felicia F.

Residential Client


Chris D.

Residential Client

Aqua Master quoted me a very fair price for waterproofing and finshed the job ahead of schedule. We haven't had any water issues in our post-war hm since then. Highly recommend this business for its professionalism and quality of work. Hire with confidence!

How it Works?


Discovery Call

Connect with one of our certified experts, so we can advise on the best way to approach your project.


On-Site Survey

More complex projects require on-site surveys, where a certified Technician will provide a no-obligation estimate.



We sign a contract that outlines details of your project.



We do the work, you get peace of mind and a 25-year transferable warranty.

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What are your Service Areas?

Proudly Serving Southern Ontario and Beyond





King City

York Region















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