Posts by Carl McDowell
White Powder on Basement Walls (Efflorescence): What It Means & How to Fix It
If you’ve noticed a white, chalky residue on a basement wall, you’re probably looking at efflorescence. It often gets mistaken for mould, but it’s usually a mineral deposit left behind when moisture moves through concrete, block, brick, or mortar and then dries at the surface. It’s not the powder itself that matters most. It’s the…
Read MoreHow to Tell If Your Basement Needs Waterproofing (10 Warning Signs)
Interior of a basement showing different signs to why basements leak It’s easy to miss early signs, but catching these visible signs of foundation problems can save thousands in the long run. Keep an eye out for: 1. Visible cracks in basement walls or floors 2. Cracked foundation walls. 3. Minor cracks that may develop…
Read MoreHow to Waterproof a Basement from the Inside: Step-by-Step Guide
A wet basement isn’t just an inconvenience — in the Greater Toronto Area, it’s a structural threat, a health hazard, and one of the costliest problems a homeowner can face. Ontario flooding events have resulted in over $2.4 billion in home insurance claims in 2025, according to the Insurance Bureau of Canada, making basement protection…
Read MoreToronto Neighborhoods Most at Risk for Basement Leaks
If you own a home in Toronto, your basement is quietly under attack — and it likely has been for years. According to the Canada Mortgage and Housing Corporation (CMHC), over 60% of Canadian homes will experience some form of water damage or basement leak in their lifetime. In the summer of 2024 alone, severe rainfall…
Read MoreTop 10 Reasons why your Basement is leaking in winter
So you have a leak in the basement… How and What To Do Winters mean holidays and fun but it also comes with the problems of flooded basements. No one wants to ruin their holidays by mopping out the water from a flooded, leaky basement when you can easily enjoy with your family. It is…
Read MoreHow Much Does Basement Waterproofing Cost? (2026)
Homeowner’s Toolkit Waterproofing Cost Calculator Waterproofing Cost Calculator Add one or more services to build your estimate. For an exact quote, please contact our team. Service type Exterior waterproofing (per linear foot) Interior waterproofing (per linear foot) Sump pump Sump pump with battery back-up Interior backwater valve Exterior backwater valve Existing sump pump replacement Battery…
Read MoreFrench Drain Installation to Stop Backyard Flooding
The Problem (before) The homeowner contacted Canada Waterproofers after dealing with ongoing flooding in the backyard, especially after heavy rainfall. Water was pooling near the rear of the house and slowly moving toward the foundation, raising concerns about long-term water damage and basement issues. The yard wasn’t draining properly, and each storm made the situation…
Read MoreDrain Backup & Toilet Leak Repair
The Problem (before) The homeowner reached out after noticing water coming up from under the toilet and ongoing drain issues that kept getting worse. At first it seemed like a simple blockage, but the problem kept returning, which was a clear sign something deeper was going on below the slab. Inspection & Findings We started…
Read MoreHow to Shut Off Your Home’s Water Supply: Interior & Exterior Water Shut-Off Valves
A burst pipe or plumbing failure can flood your home in minutes—causing major structural damage, mold growth, and costly repairs. Knowing how to shut off your home’s water supply is one of the most important steps you can take to protect your property. At Canada Waterproofers, we help homeowners prevent and recover from water damage…
Read MoreBackwater Valve Cost in Toronto and GTA
If you own a home in Toronto or the GTA, installing a backwater valve is one of the smartest things you can do to protect your basement from sewer backups. It’s not the most glamorous upgrade, but it can literally save you tens of thousands of dollars in damage and a huge amount of stress.…
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