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Exterior Basement Waterproofing Toronto

Exterior Waterproofing for Your Property!

Welcome to Aquamaster, your expert exterior waterproofing company in Toronto & Ontario. Since 2009 we helped thousands of properties prevent & repair basement water leaks.


Book your FREE on-site estimate to learn how basement waterproofing can help protect your property!

Built to Last for Decades



What is Exterior Basement Waterproofing?

Exterior waterproofing refers to the process of preventing water from entering the foundation or basement walls of a building from the outside. It is a method used to protect the structure from water damage, such as leaks, dampness, and mold growth. Unlike interior waterproofing, waterproofing the basement from the outside is considered a permanent solution that actually prevents water from entering your basement, as opposed to managing the water that has already made it through.

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Why Waterproof Your Property from Outside?

Benefits of Exterior Waterproofing Toronto

A dry & healthy basement is something that every household wants. The heavy rainfall, snow melts and high humidity can create unwanted risks to the cozy basement space. This can pose risks especially if your basement is finished – water leaks can damage not only the foundation but also the drywall, floor coverings, and more.


In cases like this, you will likely see wet or damp basement floors, wet wall stains, mold growth or a musty smell. In case you do, it’s very important to act ASAP. Wet basement problems don’t fix themselves. In fact, they only tend to get worse over time.


While there are a lot of different approaches to wet basement repairs, exterior waterproofing is considered to be the most effective solution.


This is because waterproofing your basement from the outside will involve installing a waterproofing membrane – a barrier that will minimize the interaction your foundation has with the groundwater. The result – is minimum water makes it to your basement (or if done properly – no water at all).

Find Out What Your Project Could Look Like

Exterior Waterproofing Gallery

Here is What your Exterior Waterproofing Project May Look Like

Exterior Basement Waterproofing Process

Exterior waterproofing process by Aquamaster involves top quality materials & workmanship to ensure the waterproofing is done right and lasts for a long time. In order to achieve a quality and lasting solution, our team will make sure your foundation is sealed with the waterproof coating from the outside. In a nutshell, this typically involves excavating around the foundation, claning and drying the foundation walls. Our team will then repair any of the newly discovered wall cracks and begin the waterproofing process. Here is more details of the process.


A professional waterproofing contractor assesses the building to determine the extent of water infiltration, the condition of the foundation walls, and any other potential vulnerabilities. Our team will perform a visual inspection, may also conduct tests, and analyze the drainage patterns around the building.

Wall Repairs

Next, we will need to fix wall cracks. Any cracks, gaps, or damaged areas in the foundation walls will be repaired. This can involve filling cracks with hydraulic cement, epoxy injections for structural cracks, and patching damaged sections. The goal is to create a solid and seamless surface. Many of these cracks are not visible from the inside, so it’s good that we caught them early on.


Once the waterproofing membrane and drainage system are in place, the excavated area is backfilled with soil and gravel. The soil is carefully compacted to provide proper support and prevent settling. The grade of the soil and gravel is also adjusted to ensure water flows away from the building.


The area around the foundation is excavated to expose the exterior walls. This is typically done using heavy machinery such as excavators or backhoes. However, in cases when that is not much space evailable we may need to do the diffing manually. The depth of the excavation depends on the specific requirements of the project.

Waterproofing Membrane Application

A waterproofing membrane is applied to the exterior walls. The type of membrane used may vary, but common options include asphalt-based membranes, rubberized asphalt membranes, or polymer-based coatings. The membrane is typically applied in multiple layers to ensure effectiveness.

Landscaping & Restoration

Finally, any landscaping or hardscaping features that were removed during the excavation process are restored. This may include reseeding the lawn, replanting vegetation, concrete work or repairing any pathways or structures that were disturbed.

Wall Preparation

Once the walls are exposed, they are thoroughly cleaned to remove dirt, debris, and any loose or deteriorated material. The contractor may use power washing, wire brushes, or other appropriate methods to ensure a clean surface.

Drainage System Installation

A drainage system (weeping tile aka French drains) is installed around the foundation to redirect water away from the building. This includes components such as drain tiles, gravel, and perforated pipes. The system collects water that may accumulate near the foundation and directs it towards a suitable drainage outlet, such as a sump pump or a drain field.

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Which WAterproofing is Right for You?

Interior vs Exterior Basement Waterproofing

Interior and exterior waterproofing are two different methods used to protect buildings and structures from water intrusion and moisture damage. Here's a comparison of the two:


How it Works

  • Interior Waterproofing - this method focuses on managing the water that has already made it inside your basement. Waterproofing membranes will redirect water to the drainage system which leads to the susmp pump that pushes the water outside your basement.

  • Exterior Waterproofing - this method is designed to stop water from entering the structure altogether. It creates a barrier on the outside of the building, preventing water from reaching the foundation walls or basement.

Location of Application

  • Interior Waterproofing - the work is typically performed inside the building, primarily in the basement or crawl space. It involves the installation of drainage systems, sump pumps, vapor barriers, and sealants on the interior surfaces.

  • Exterior Waterproofing - the work is done outside the building, primarily around the foundation walls and basement. It includes techniques such as excavating around the foundation, applying waterproof membranes or coatings, and installing drainage systems.

Accessibility and Disruption

  • Interior Waterproofing - since the work is performed inside the building, it is generally easier to access and requires less disruption to the landscaping or external structures. However, it may require some interior finishes to be removed temporarily.

  • Exterior Waterproofing - this method involves excavation around the foundation, which can be more intrusive and disruptive. It requires access to the exterior walls of the building and may involve removing landscaping, decks, or other structures temporarily.


  • Interior Waterproofing - generally, interior waterproofing tends to be less expensive compared to exterior waterproofing. The materials and labor costs are often lower, as it involves less extensive work and excavation.

  • Exterior Waterproofing - due to the excavation, additional materials, and labor required, exterior waterproofing is usually more expensive. It often involves more complex construction techniques and can be a larger-scale project.


  • Interior waterproofing system - will require an ongoing maintenance for the sump pump, drainage system, sump pump discharge line etc.

  • Exterior waterproofing – normally doesn’t require maintenance.

The choice between interior and exterior waterproofing depends on various factors such as the source and severity of water issues, budget constraints, site conditions, and personal preferences. In some cases, a combination of both methods might be necessary for optimal water management and protection of the building. It's recommended to consult with a waterproofing professional or structural engineer to assess the specific needs of your property.


Make sure to get one of our experts for an on-site assessment to decide what waterproofing method is right for you.

  • Why is Basement Waterproofing Important?
    Your property may be protected from a number of unfortunate situations by having foundation and basement waterproofing done. Other then catching fire and burning down, flooding in a basement is one of the worst accidents that can happen in a home. When foundations begin to fracture, water can enter the basement and damage the bases of the flooring and walls. In the worst-case scenario, it may even cause a home to collapse. Basement waterproofing applies not just to basements but also the home’s foundations. Basement waterproofing is an essential fix if you have water, mildew, or rotting issues in your basement. Basement waterproofing can both solve any underlying issues in the space and be a preventative countermeasure against potential water damage. 1. Protects Structural Integrity of your Home - another advantage of waterproofing your basement is that it strengthens the structure of your home. Take note: your basement acts as the foundation for your home. It must be robust enough to complete this task. Waterproofing may ensure that your home lasts a prolonged lifespan. This is especially true if your home frequently experiences severe weather or adverse temperatures. 2. Increases the Value of Your Home - If you intend to sell your house in the near future, consider basement waterproofing. A home free of dampness and leaks is a crucial selling element for home buyers, making it more desirable. If you have not improved your basement in decades, buyers may consider it a significant inconvenience. This might give visitors a negative image of your home, especially if they smell the mustiness of old water. Distinct odors and signs of excess water can drive away potential buyers. Basements with waterproofing are also simpler to clean. This is another selling factor that can be desirable to future residents. Your home is more valuable if it is effectively protected and maintained. This adds more value to your home while you still live there and in the case that you do end up selling your home, a return on investment. In most circumstances, you may deduct the expenditures of the waterproofing job. 3. Prevents Mold & Mildew - Mold can be a serious problem if it develops in your home. Mold will gradually destroy the area where it colonizes and has the potential to create health problems for your home’s inhabitants. People who suffer from Bronchitis are especially vulnerable to mold and poor air quality. Mold grows from small spores that are invisible to the human eye and can be found in both outdoor and indoor air. Mold can start growing inside if it is on a damp surface. It simply requires moisture, water, and dust to thrive. Since dust is everywhere, if it settles on a damp surface, it might begin to grow indoors. That should give you an idea of the dangers of a damp or wet basement. However, basement waterproofing can prevent mold buildup from ever happening. Although mold typically stays unnoticed until it has developed, seeking the assistance of a qualified professional is a proactive decision. Certified specialists are trained to deal with mold in the home and are up to date on the latest products, techniques, and laws. Now, prevention is the greatest choice when it comes to keeping mold out of your home. So, if you discover a moisture or water problem, have it rectified or checked as soon as possible. With the benefits of basement waterproofing, there are two main types to consider, exterior basement waterproofing and interior basement waterproofing. Each with its own advantages and applications.
  • What are the Causes of a Leaky Basement?
    There is a number of things that commonly cause basement to leak, here is a couple of the most common ones. Basement Window Wells - Water penetration through your window sill can be caused by water buildup around near-grade basement windows. To remedy this, water entering your window area should be drained by adding or replacing defective window wells, as well as installing vertical weeping tile and a 3/4 gravel bedding. This will keep your foundation from leaking and your basement from flooding. Home Foundations made of Block or Bricks - Air gaps and mortar joints in block and brick walls may allow water to penetrate the crevices of your walls. Water infiltration inside block and brick foundations may be prevented and repaired using a mix of exterior and interior waterproofing methods. Water collecting between brick walls can be drained by drilling into the foundation’s interior to remove the water buildup. Basement Leaks Caused by Joints - joint leaks occur at the intersections of your wall and footing, your basement floor and foundation, and joints where additional extensions have been installed. To repair and fill these various sorts of joints, hydraulic cement is used. The altered cement is critical to preventing more damage and water leaks. Top of Foundation Leaks - If the sill is not sealed or if the original seal has deteriorated, the area where the foundation meets the brick might become a source of water leakage. Maintaining the sill with a waterproof sealant is critical for resolving this problem and avoiding water infiltration into the sill. Water may still pass through this place even if there is no hydrostatic pressure.
  • What is Internal Basement Waterproofing?
    Internal basement waterproofing is another method of stopping water damage and flooding in your basement. While external repairs provide the best solution, an internal project can be performed when foundation digging is not optimal. The internal waterproofing method may be the best option depending on a specific criteria: The area surrounding the exterior cannot be accessed because the space is confined or the area cannot be reached. The water problem is not a foundation leak but a hydrostatic pressure problem, which means the groundwater under the concrete slab raises up and down and causes the water to penetrate through the basement slab or where the wall meets the floor. This groundwater can also mean there could be an underground creek where the house was built. The internal system is an economical solution for unfinished living areas. Interior Wall & Floor Sealer - Internal waterproofing allows you to install drainage on the inside of your home, rerouting water intake to a correct point of release. The major advantage of implementing an internal waterproofing system is that it may collect water passing through the wall and beneath the footing. Basement walls that have been pierced will be drained away by our drainage membrane, creating a barrier between your wall and your living space. Water that travels beneath the footing might cause wet spots and leaks on your basement floor, which will be covered by the drainage board and drained through new weeping tiles. Sump Pumps - The fundamental component of every waterproofing system is a place where the water in the system may be discharged. When current drainage is clogged or there are no other drainage alternatives, your expert may recommend a sump pump installation. In your basement, a pit is dug to serve as the lowest point of your waterproofing system. Inside the pit, a high-quality plastic liner is put, allowing water to flow in by gravity drainage. The trigger of a sump pump, which ejects water from the sump pit to the exterior of the home, detects water buildup. We only utilize high-quality pumps and plumbing materials, and we also provide battery backup pumps that will keep working even if your power goes out. Before we perform any work, we provide you with the same inspection service. This is important to ensure that we cover every problem that is leading to a wet basement issue. After we have identified all of the trouble areas, we will provide you with the best internal waterproofing solution for your unique needs. Our internal waterproofing solutions may include repairing all cracks or breaks in your foundation walls, adding a waterproof membrane to the interior and replacing any defective weeping tiles. A French drain installation can also be part of your solution. This image gives you an overview of some of the problems that cause a wet basement: No matter how well your home was built, the basement can still develop leaks. Homes are constructed to meet industry and safety standards. However, over time, homes settle and the foundation walls and floor may crack. Other water problems may come from the water table under your home or changes in the city sewer system. A small leak now can turn into a major problem as time passes. Leaks also create mold, mildew and water damage. This can end up requiring very costly repairs to your home. Professional basement waterproofing requires knowledge and skills, along with the right resources and tools. A fully effective treatment includes addressing drainage and adding sealers. Once your basement is professionally waterproofed, it will remain dry. We guarantee this. Call us, or email us today, so we can provide you with an inspection and a cost effective solution to your leaky basement problem. Our licensed experts are ready to fix any type of foundation problem you are experiencing.
  • What Causes Basement Interior to Leak?
    Damp or Wet Basement Flooring - the source of water entering the basement through the concrete floor or where the basement walls meet the floor is most likely subterranean groundwater. Rising groundwater and saturation produce hydrostatic pressure during rainy weather, which pushes against the foundation and drives water through cracks and gaps in the concrete. This stress can cause cracks in the basement floor and walls. Visible White Substances on Walls - limestone, clay, mortar, and aggregate make up concrete and the white border or patch you observe is calcium evaporating from the block. It is a sign of water or too much moisture and should be treated carefully. It is referred to as efflorescence. Since this will only show on concrete, you will only be able to see it if your basement is not finished. Other indicators will develop if your basement is experiencing excessive leaking, water damage will nearly always show some kind of warning indication. Painted Walls Appear Damaged - paint can peel away from the surface it was painted on as it ages, similarly to peeling paint in older homes. It does not, however, flake off just because it is aged. Paint may peel for a variety of reasons, including the paint being the incorrect type for the material it was painted on, the surface not being properly prepared, or humidity or moisture in the walls you painted on. Wet surfaces will not hold paint. Water vapor will discolor it, causing it to peel off the wall or poke holes in it. This can be a direct indication that the walls of your basement are holding too much moisture or are very damp. Excess Rusting - metal rusts when there is an abundance of moisture in the atmosphere. Rust can form on fuse boxes, water heaters, jack posts, and appliances due to excessive moisture and humidity. When rust occurs, remove it completely and repaint it as soon as possible, and then analyze the source of the moisture. The rust will return if not addressed immediately.
  • How Exterior Basement Waterproofing Works?
    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. Exterior waterproofing is a method of repairing a leaky basement from the outside of your home by exposing the foundation and applying the necessary waterproofing material to create a foundation waterproofing system that redirects and disperses water away from your foundation walls. This is one of the most effective waterproofing options for basement leaks and the most typical method of basement foundation repair. Aquamaster has been providing professional waterproofing to Toronto homes for many years. An external waterproofing solution is the best choice to provide the highest level of protection against basement flooding and water damage. Our experts understand the processes fully and we offer complete transparency in all the work we perform. We will explain every step of the process to you so that you will know what to expect from our work. Poor foundation drainage, high levels of groundwater, major storms and foundation cracks can all contribute to a wet basement and water damage. We will consult with you and inspect your home, drainage systems and property. We look for any problem areas and will discuss the recommended solutions to provide you with permanent protection from leaks and moisture. Every home is different and Aquamaster provides customized solutions for every job we complete. The work may involve repairing cracks with epoxy or replacing the waterproofing membrane along your foundations. In the majority of cases, external waterproofing involves digging down to the footers of your foundation to locate all the problem areas and ensure that your basement is fully protected. On some occasions, we may not have to completely dig out the foundation. You may simply need to have your weeping tiles replaced or a French drain installed. If your existing drains are clogged, the groundwater will back up and place additional pressure on the foundation walls, forcing water into any cracks. A complete inspection of your home’s drainage system and foundation is the only way to truly know what work needs to be done. The experts at Aquamaster will provide you with a customized plan to repair your basement that includes a full guarantee. We understand waterproofing in Toronto and the Greater Toronto area and our staff are experienced professionals.

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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.


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


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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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