Mississauga’s basement leak specialists for over 25 years!

Our work comes with a 25-year warranty. We’ve got your back!

Call us today  905-564-3575

Foundation cracks and basement leaks are among the most destructive forces impacting your home on a yearly basis. They can cause dampness in your basement, water damage and even flooding. Worst of all, cracks always get larger over time, creating more and more risk to your home and your belongings.

If you think there might be a crack in the foundation of your home, the time to act is now. Call us or contact us via email and let us conduct a free inspection of your home to make sure it is not at risk. We promise swift, effective service and a 25-year warranty on our work. With 25 years of experience in the Greater Toronto Area, your home is in good hands when you trust Crownseal Inc.

The Crownseal Warranty

A waterproof basement and peace of mind are the most important benefits of working with Crownseal Inc. We Guarantee Your Satisfaction and Our Workmanship, and are committed to going above and beyond in service to our customers.

All Crownseal Inc. waterproofing work is warrantied as follows:

25 Year transferable warranty:

  • Outside Excavation and Waterproofing
  • Polyurethane Crack Injection
  • Inside Drain Tile with Delta Membrane
  • Sump Pump Installation
  • Rod Hole Repair
  • Pipe and Conduit Repair
  • Weeping Tile Installation and Replacement

about us

Let Us Know

How We Can Help

Family Owned

Crownseal Inc. is a family owned and operated business, successfully serving clients in Southern Ontario for over 25 years.


Offering both interior and exterior waterproofing options, our customer base is extensive and consists of residential, contractors, real estate, insurance, home inspectors, property management, government shelters & youth centres, home service clubs. We have been servicing these customers for over 25 years.

Our Work

100% of operation is foundation waterproofing & repairs. We are specialists and offer several different solutions to meet your needs. We employ TOP OF THE LINE PRODUCTS, and will give you the best case solution…every time!


We stand behind our work, and we are proud of it.

All work is backed by a 25 year transferable warranty on exterior and interior work.

over 25 years of dedication

Customer care, its our foundation

  • I would like to thank you for your professional and speedy service, getting my basement back in order was critical. Working with you was the best reno/construction experience in years. Will recommend to y friends and family.

    Rodrigo Zefferino Owner
  • Thanks so much for your great work yesterday. We appreciate the speedy service! Many thanks again. Alison

    Alison Interior Designer
  • I enjoyed working with you at our Milton house. You have a good crew working for you. If I can offer any recommendations of work for your company I would be pleased to do so. Yours Sincerely, Doug

    Doug Milton House