Quick answer: On Vancouver Island, most moisture problems come from four places: water that isn't being carried away from the foundation, failed seals and flashings on the building envelope, ventilation that can't keep up with the humidity indoors, and small leaks nobody noticed. Catching any of these early is inexpensive. Leaving them is what turns a maintenance item into rot, mould, and structural repair.
I'm Adam Lockwood, owner and lead inspector at Lockwood Home Inspections, serving Greater Victoria, the Saanich Peninsula, the West Shore, the Cowichan Valley, and Nanaimo. With a background in custom home building and timber framing, I've seen what a coastal winter does to a house that isn't shedding water properly.
Why Coastal Homes Are Different
Our climate is mild, wet, and long. Rain doesn't arrive as a single dramatic storm so much as months of steady water, and mild temperatures mean things stay damp rather than freezing dry. Add mature trees shading roofs, and organic growth becomes part of the picture.
None of this is a problem for a house that's kept up. It becomes a problem when a house is asked to handle a coastal winter with a blocked downspout, a failed seal, or a bathroom fan that vents into the attic.
The Early Warning Signs
Most moisture problems announce themselves before they become expensive. What to look for:
- A musty smell, especially in a basement, crawlspace, or closet on an exterior wall. Your nose often notices before your eyes do.
- Staining or discolouration on ceilings, walls, or around windows, including old stains you assume are historical. Worth confirming rather than assuming.
- Peeling paint, bubbling finishes, or soft trim, particularly at the bottom of window and door frames.
- Condensation on windows that persists, or visible mould at the frame edges.
- Damp or efflorescence on foundation walls, or a crawlspace that feels humid.
- Cupping or lifting flooring, especially near exterior doors, dishwashers, and bathrooms.
- Moss and debris building up on the roof, in valleys, or in gutters.
- Water pooling near the foundation after rain, or soil sloping back toward the house.
Where Water Usually Gets In
Drainage and grading. This is the most common one. Downspouts that discharge right at the foundation, or ground that slopes toward the house, deliver water exactly where you don't want it. The fix is often as simple as an extension.
Perimeter drains. Buried around the footing, they carry groundwater away, and they don't last forever. They collapse, fill with silt, or get invaded by roots, and because they're underground there's nothing to see. A damp basement with no obvious source is a reason to have the line scoped with a camera.
The building envelope. Failed caulking, worn flashing at roof-wall junctions, deteriorated window seals, and gaps at penetrations. Small openings, but they only need to work against you a few hundred times a winter.
Ventilation. Bathroom and kitchen fans that are undersized, disconnected, or terminating in the attic instead of outdoors. Moisture generated inside has to leave the building, and if it can't, it condenses on the coldest surface it can find.
Plumbing. Slow leaks under sinks, at supply connections, and behind appliances. Undramatic and easy to miss until the damage is done.
Mould: What Actually Matters
Mould needs moisture. That's the useful thing to remember, because it means the visible growth is a symptom, not the disease. Cleaning a surface without fixing the water source just resets the clock.
So when I find mould-like growth during an inspection, the question I'm working on is where the water is coming from. That's the finding that saves you money. Where growth is extensive or in a living space, testing and remediation by a specialist is the right call, and identifying the moisture source first makes that work far more likely to hold.
Seasonal Maintenance That Prevents Most of This
A short list, done twice a year, prevents the majority of what I find:
Before the wet season: clear gutters and downspouts, confirm discharge is carrying water well away from the foundation, clear roof debris and check for moss, look over flashings and caulking, and test that every bathroom and kitchen fan actually moves air.
During and after: walk the perimeter during heavy rain and see where water goes, check the crawlspace or basement for damp, and look at ceilings and exterior walls for new staining.
Fifteen minutes with a flashlight after a big rain tells you more about your house than almost anything else you can do.
When to Bring Someone In
Call for an inspection when you notice a musty smell you can't place, staining that's new or growing, a basement or crawlspace that stays damp, or water pooling at the foundation. Also worth doing if you're buying a home and want to know what a coastal winter is going to do to it.
Thermal imaging is genuinely useful here, because temperature differences behind a surface can reveal moisture that a visual inspection alone won't show. I include it when it's appropriate, and I can arrange a perimeter drain camera inspection when the symptoms point underground.
Booking
If something in your home has you concerned, or you're buying on Southern Vancouver Island and want to know what you're taking on, get in touch. You'll work directly with me, you'll get a same-day digital report with clear photos, and you can call or text with questions afterward.