Carpet in a below-grade suite can hold moisture for weeks without ever feeling wet to the hand. That is the part most people miss about mould prevention in Victoria BC homes. The surface feels fine, the backing and the underlay are damp, and the smell arrives long before anything shows up that you can see.

Most of our rain falls between October and March. Through those months the windows stay shut, the laundry runs indoors, and four people breathe and shower in a house that was built before anyone installed a bathroom fan. Carpet is the largest absorbent surface in the building. It takes in whatever the air is carrying.

Why the damp ends up in the floor

Mould needs spores, something organic to feed on, and water. The first two are already in your house and always will be. Spores drift in on shoes and on the dog. The food is wool fibre, dust, skin cells and dander, all of which settle into the pile no matter how well you vacuum.

Water is the only one of the three you control.

In older Fairfield and James Bay houses, the moisture often comes up rather than down. A concrete basement floor with no vapour barrier under the carpet wicks damp out of the ground all winter. In newer Langford and Colwood builds the problem is usually air: a tight envelope, wall-to-wall synthetic pile, and humidity that has nowhere to go. Both end with the same result at floor level.

The spots that go first

Growth starts where the carpet is coldest and the air moves least. Check the perimeter of a basement room where the carpet meets the baseboard on an exterior wall. Check under the bed, under a dresser pushed flat against the wall, and inside closets on the north side of the house. A rug laid over a bathroom floor or over bare concrete is worth lifting once a season.

Rooms above a crawl space give themselves away underfoot. If one bedroom feels cool and slightly heavy to walk on in February while the rest of the house feels normal, that floor is holding water.

Signs worth checking this week

A musty smell that gets stronger as you lower your head. Stand up and you may not notice it. Kneel on the carpet and you will.

Dark speckling along the very edge of the carpet, right where it tucks into the tack strip. People often read this as ordinary filtration soiling from air moving under a door. Sometimes it is. In a basement in January, it often is not.

Allergy symptoms that get worse in winter. Pollen runs the other direction, so a stuffy house from November to March points at something indoors.

A carpet that stays damp for more than a few hours after a spill, a wet dog, or a cleaning. That tells you the room is not drying, and a room that does not dry will grow something eventually.

Mould prevention for Victoria BC homes between cleanings

Keep indoor humidity below 50 percent. A hygrometer costs less than a takeout dinner and it takes the guessing out of it. Through the wet months, a dehumidifier in the basement does more for the carpet upstairs than most people expect.

Run the bathroom fan for twenty minutes after every shower. No fan, which is common in character houses, means opening the window instead, even in the rain.

Pull furniture a few centimetres off exterior walls so air can reach behind it. Vacuum slowly, and go over the perimeter of each room rather than only the traffic paths, because the edges are where the dust and the damp meet.

Deal with spills the same day. Blot with a towel, press hard, then put a fan on the spot. Water left in the underlay overnight is the start of most of the odour calls we take.

One more thing about timing. If you were planning to rent a machine from the grocery store in January, think about what a soaked carpet does in a house that is already at 60 percent humidity. Drying is the whole problem here, and a rental machine leaves far more water behind than it lifts.

What a professional cleaning actually removes

Cleaning takes out the spores, dust and dander sitting in the pile, which is the food supply. It does not fix a leak, and we will say so.

We use a low moisture carpet cleaning system for exactly the reason this post exists. The solutions are non-toxic and safe around kids and pets, very little water goes into the carpet, and the floor is dry in one to two hours. In a Victoria winter that difference matters more than it would in Kamloops. A carpet that is still damp at bedtime in a humid house has undone half the point of cleaning it.

For a basement suite or a rental turnover, we usually suggest booking on a day when you can leave a window open for an hour afterward. It is a small thing that speeds the last of the drying along.

Carpet cleaner or remediation specialist

Call a mould remediation company, not us, if any of the following is true.

There is visible growth on drywall, framing, or the underside of subfloor. There is an active leak, a failed foundation drain, or standing water. The smell comes back within a week of a thorough cleaning. Someone in the house has asthma or another respiratory condition that has worsened since the smell started.

In those cases the carpet is a symptom. Remediation handles the source and the affected material, and carpet cleaning comes afterward, once the room is dry and staying dry. Booking a cleaning over an active water problem spends your money on a result that lasts three weeks.

If the carpet smells musty but the walls, the baseboards and the underlay are sound, cleaning is the right call and the difference is obvious the same day.

Get on the schedule

Phone Joanne at (250) 710-5244 and describe what you are smelling and where in the house you smell it. That conversation is usually enough to sort a cleaning job from a remediation job, and she will tell you honestly which one you have. Email works too: [email protected].

We clean carpets across Victoria and out to Sidney, Duncan, Nanaimo and Ladysmith, with a $280 job minimum. Weekday bookings run from 7:30 in the morning to 7:30 at night, and Saturdays until three.