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9 minute read Published on Jul 2, 2026 by BrokerLink Communications
You’re walking past a familiar hallway when something small catches your eye, like a faint ripple in the paint or a shadow that wasn’t there last week. In Canada, it doesn’t take much for water to creep into a home, from hail cracking a home's siding to an ice dam forcing melting snow back under the shingles.
Below, we'll help you learn how to spot the early signs, what steps you need to take and where your home insurance comes in. Not sure what your policy includes? Connect with a BrokerLink advisor today.
If you've spotted what you think might be water damage, it's important that you protect yourself and your home before you start inspecting it.
Health Canada warns that mould and dampness in a home can pose serious health risks. It can irritate your eyes, nose and throat, trigger coughing or eczema, and make asthma or other breathing issues worse, especially for kids, older adults or anyone who already has trouble with their lungs. If you suspect that mould might be covering a large area, contact a licensed professional for guidance.
When water has been somewhere it shouldn't have been, or if it's still there, there are often noticeable clues. Because moisture can move fast, and mould can begin growing within about 48 hours if the area stays damp, being able to spot these signs early can often save you from costly repairs later on.
Below you'll find some examples of the most common signs of water damage, like peeling paint or soft walls, to help you know what visible signs to look for:
What you see or sense
Likely source
What to do
Who to call
Brown/yellow rings or map-like stains on the ceiling or wall
Leaking roof, upper-floor bathroom, laundry area or a cracked pipe from above
Gently press around the stain to see if the surface is damp; avoid poking or cutting.
Photograph stain for records.
A plumber, roofer or water-damage restoration professional
Peeling, bubbling or flaking paint, plaster damage or hairline cracks.
Moisture seeping behind drywall or plaster from possible plumbing issues, slow roof leaks or condensation buildup
Avoid sanding or scraping paint; try to keep the area dry; note nearby water sources (showers, roof, leaks).
A plumber for pipes or an exterior repair specialist for leaks through the roof or siding
Drywall feels soft or spongy, a sagging ceiling or a bulging wall
Water pooling behind drywall; it could be a major pipe leak or a roof issue
Evacuate the area under the sagging ceiling, move valuables away and photograph the bulge. Avoid standing under a sagging ceiling.
A restoration or structural repair contractor, and possibly a plumber or roofer, depending on the source
Musty smell or earthy odour with no visible stain or moisture
Hidden damp cavity, condensation build-up, hidden leak or a previous water leak that's not yet visible
Open windows (if safe), improve ventilation and avoid disturbing the walls. Look around baseboards, closets and less-used rooms for damp spots.
A mould specialist or a qualified home inspector
Small patches of mould (black, green, fuzzy) on walls, corners or baseboards
Persistent moisture from leaks, condensation, poor ventilation or past water leaks
Close the room off from the rest of the home, document with photos and ventilate by opening a window if possible. Do not touch mould with your bare hands or breathe it in.
Small area: homeowner (with PPE)
Large or recurrent area: certified mould remediation contractor
Sound of running water when no tap is on or the water meter spinning with no usage
Pressurized leak inside the wall, basement, slab or hidden pipe
Shut off the main water valve, check appliances and fixtures for drips, then record the water meter reading. Wait 30 to 60 minutes without using any water, then check the meter again to see if it has changed.
A plumber for a pressurized leak and a water-damage restoration company if the damage has spread
Unexplained sudden increase in water bill
A slow, hidden water leak, likely under the slab, behind the walls or an outside line that's leaking
Compare meter readings over 24 hours with no water use and look for damp baseboards or foundation spots
Plumber to locate and repair the leak and a restoration/moisture-specialist if it caused structural damage or mould
Cold spots or sweating pipes; puddles near the heating ventilation and air conditioning (HVAC) system
Condensation issue, blocked drain line or sweating or frozen pipes
Switch off the unit if HVAC is involved, check the drain pan and dry the area gently
An HVAC technician or plumber
Please note that even though the table lists different professionals who can help, your first call should always be to your insurance company or broker before any restoration work begins.
When to act fast and contact a professional for water damage in walls and ceilings:
Okay, you've spotted a leak. Now what? First, you'll want to figure out whether it's an active water leak or an older one. Here's what you can do:
Next, if it seems like the leak is active, you'll want to slow it down. Start by turning off the tap or appliance closest to the problem. If water keeps coming, locate and turn off the main shut-off valve instead. If that still doesn't help, it might be rainwater from exterior damage. After heavy rain, using a tarp or towel barrier may help buy you some time until you can get it fixed.
There are a few easy ways that you can check for a leak before you make that phone call to a professional:
It's often best to start with your water meter. Turn off every indoor and outdoor tap and appliance, then watch the meter's dial. If it keeps moving, it may mean that water is still escaping somewhere in the system.
Note that toilet fill valves, humidifiers, ice makers and irrigation timers can affect results. Try to isolate them if you can, or consider doing your water meter test at night.
For pipes or appliances you’re unsure about, place a dry paper towel underneath and run a small amount of water from a nearby tap. If there's a leak, a fresh drip will show up on the dry paper towel right away. You can also use this to check windowsills for leaks by placing one before it rains.
You can also add food colouring or a non-staining UV dye to a sink or tub to see if coloured water finds its way into places it shouldn’t. This one is handy for leaking toilets. Drop a bit of food colouring or a dye tablet into the tank, then leave it alone for 10 to 15 minutes. If the water in the bowl starts to pick up that colour, it means there's a leak.
A thermal camera can read surface temperatures and shows cooler spots as darker areas on the screen. Since damp material loses heat faster than dry material, those darker patches may hint that moisture is sitting behind the wall or ceiling.
Pressing a moisture meter's small sensors against the surface will give a reading. You can then compare it to different parts of the wall or another wall altogether. A higher reading may suggest that part of the wall is holding moisture.
Please note that these tests can only give you possible answers. If you plan to open up a ceiling or wall for a better visual, make sure the power is off, the area is safe and you’ve taken a few photos so you have a clear record of what things looked like before you started.
It's not uncommon for homeowners to misread water stains. A ceiling stain under a bathroom is very different from a stain on an exterior wall after a storm, even if they look similar. Below, we've put together a table to help figure out where the moisture may be coming from because the location often hints at the most likely cause:
Where the moisture shows up
What it often points to
Ceiling or wall below a bathroom or kitchen
Supply lines, drains or traps, loose toilet wax rings, worn grout, slow leaks from sinks, tubs or appliances
Exterior walls or attic slopes
Wind-driven rain, worn or missing roof flashing, ice dams pushing meltwater back under shingles
Near appliances or HVAC equipment
Condensation from air conditioners, humidifier line leaks, washer or dishwasher hose issues
Basement walls or floors
Foundation seepage, rising groundwater, sump pump problems, discharge line blockages or overflow
This short window is when you can do the most to slow the damage. Mould growth or structural integrity problems can start to form quickly if the area isn’t dried and taken care of as soon as possible. According to Health Canada, mould growth can begin within 48 hours of excess moisture. Here's what you need to know:
The First 72 Hours Are Key After Water Damage—Here’s What to Do in the First 0–6 Hours:
After the Initial Response: What to Do 6–24 Hours After Water Damage:
After a day has passed: actions for the next 24–72 hours:
It's important that you keep a log of what you did and when, as it can help both contractors and your insurer better understand the full picture.
When water shows up where it shouldn’t, the most important thing is to stop the damage it can cause. The next most important thing is knowing how your policy might respond.
Most home policies cover sudden or accidental water damage, such as a burst pipe or rainwater entering a damaged roof from a fallen tree, but certain conditions may apply. For example, if your dishwasher leaks and causes water damage, your policy will often respond as long as the problem wasn’t caused by wear and tear or a lack of maintenance.
Extended absences can also affect how a water damage claim is handled. Many insurers have requirements around vacant or temporarily unoccupied homes, especially in winter when frozen pipes are a concern. If you plan to be away for an extended period, review your policy requirements for regular property checks and notify your insurer if necessary.
Please note that other types of water damage that are generally not covered include overland water, sewer backups, groundwater entry or slow seepage, unless you add endorsements to your policy.
In 2024, Canada recorded a record-high $8.5 billion in insured losses from severe weather, with much of it tied to water damage from hail, flooding and heavy storms. This means that protecting your home against all types of water damage is now more important than ever. Some insurers reward households that go the extra mile by offering discounts if you install water-leak sensors, automatic shut-offs or water alarms that help detect or stop leaks early.
Hidden water damage can wreak havoc on your home. Thankfully, home insurance exists to protect homeowners from the financial ramifications of water damage caused by everything from overland water and sewer backups to burst pipes, roof damage, leaky appliances and more.
For more information on how property insurance can protect you against water damage or flooding, contact BrokerLink. As property insurance experts, we can also offer tips to protect your home from water damage and other important information on flooding prevention. Get in touch to speak with a licensed home insurance broker today!
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