Detecting Water Leaks In Your Basement

leaking basement where foundation meets first floorWinter in Toronto is cold and wet.  The thawing periods in between the freezing weather is where many basement starts to show signs of leaks. AS accumulated snow and ice start to melt, it makes it’s way into the earth, leading to basement leaks. Of course,  It can come from a number of areas, including sources inside your home.  Each problem has it’s own potential solution,

Almost every basement leaks from time to time, especially if it’s never been properly waterproofed from the exterior. It’s a natural phenomenon because building materials are porous unless treated properly, and structural cracks develop as the ground settles over time. This leaves important clues for anybody who knows what they are about. You just need to think logically about what causes dampness, and which of the following apply to you:

1- If your basement ceiling is moist then the water is likely coming from a drain or water pipe above, that could have sprung a leak. Alternatively, your problem could be the consequence of warmer air condensing on cooler pipes and dripping down. These are simple problems the average home handyman can probably fix themselves.

2- Surface water is a common cause of signs of damp on upper basement walls. It’s often caused by rain and flooding. If you allow water to pool on the surface, then the earth will absorb it because that’s what soil does. Where else do you think tree roots get their water from? It’s easy to figure out you need to lead storm water away from the walls of your house, especially near your basement location.


If the surface slopes towards your home then you need to re-grade it to a fall of one inch to one foot away from it. It will help greatly if you pave the immediate area too. This should deal effectively with damp showing in the upper parts of your basement walls. Don’t forget to clean out your window wells at the same time too.


  1. Ground water is usually the driver behind damp on lower basement walls and floors. This is moisture that travels through natural earth strata from elsewhere to your home. If your house is standing on a rise you shouldn’t have it. If it’s in a hollow then it’s inevitably there in winter. This is what causes damp on lower walls, and seepage through the joint between the walls and floor.

This is a tougher nut to crack, especially because problems behind walls and under floors that are hard to get to. If the leakage is radical you might have to excavate from outside and install the drainage systems builders call french drains and weeping tiles. If it’s minor, then a sump pump system might suffice.

It’s simpler when you understand the basics. However many of the cases we’ve dealt with had multiple causes that overlap. The best course of action is to look for the simple solutions and work your way back. If problems persist you’ll most likely want to call in a basement waterproofing company to conduct a full assessment of your water problems.


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NuSite Group is a Toronto based basement waterproofing and foundation repair company that specializes in Basement Waterproofing, Basement Lowering, and Foundation Repairs. Call us today at 416-622-7000 or 905-731-1228 for a free in-home estimate and inspection.

One Response to Detecting Water Leaks In Your Basement

  1. Professional and experienced licensed contractors will effectively waterproof your basement and leave you and your family with a comforted feeling of a safe and dry basement.Whether it’s a mold problem, water leak, foundation crack, commercial property water problem, crawl space or just a water presence in your basement

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Customer Testimonials

Interested in working with us? Check out some of our customer testimonials below and find more on Homestars. We are one of the highest rated basement waterproofing companies in Toronto

Mark Lipton - Homestars Review

Basement Waterproofing

Our basement leaked! Of course . . . we bought a 100 year old house! But my office needed to be in the basement permanently. I interviewed 10 different companies until we decided on the Steinbergs and their crew at Nu-Site! They are professional, reliable, courteous, honest, and they really make an effort to communicate with the client about every step of the process.

Sara Jack - Homestars Review

Foundation and Waterproofing Repairs

After several years of chronic leaks, we decided to have our basement waterproofed once and for all. The team over at Nusite was professional, answered my questions during the project and stayed within their quoted price....which is always a concern for me when working with contractors. Great job overall

Joshua Persaud - Yellowpages Review

Basement Waterproofing

Had several cracks in my basement wall and they would leak whenever we had a heavy rain. It started about a year and a half ago and seems to have gotten worse over the past 6 months. I tried having my neighbor seal it, but it started leaking again within a few weeks. Called several waterproofing companies and got several quotes. Finally went with Nusite contractors for the job. They gave a reasonable quote and I liked the guy that came by for the estimate. They stayed within budget and cleaned up before they left. It's been almost 3 months now and it seems to be working great.