Mold is one of the most common problems in Winnipeg homes, and one of the easiest to miss. It grows in the dark, behind walls and under floors, and by the time you can see it the colony has usually been there for weeks. This guide covers what mold is, what it needs to grow, the types you are likely to find, the health effects, and how it gets removed properly.
Mold spores are always in the air, indoors and out. They are harmless until they land on something damp and start to feed. That is the whole problem in one sentence: spores, plus moisture, plus time. At Mold Removal Winnipeg, we see this every week in older homes across the city, usually after a spring basement flood or a slow leak nobody noticed.
What Is Mold?
Mold is a type of fungus. It grows in thread-like filaments and spreads by releasing spores into the air. Outdoors it breaks down dead leaves and wood. Indoors it breaks down your house.
Researchers estimate there are more than 100,000 types. Only a few turn up regularly in homes: Penicillium, Aspergillus, Cladosporium and Rhizopus. Most are a nuisance. A few are a genuine health concern.
How Does Mold Grow?
A spore needs six things to become a colony. Take away any one of them and growth stops.
- Temperature: mold grows best between 25 and 30 degrees Celsius. It cannot grow below 4.4 degrees.
- Moisture: damp air, wet materials, condensation, or standing water from a leak or a flood.
- Oxygen: mold needs air, the same as we do.
- Food: wood, drywall paper, carpet, fabric, dust, and many synthetic materials.
- Darkness: most mold prefers dark, undisturbed spaces.
- Time: in good conditions, mold begins to grow within 24 to 48 hours.
That last point matters most. Wet drywall left over a weekend is already a mold problem. If water has been sitting somewhere in your home, call (204) 789-1514 and have it checked.
What Does Mold Look Like?
Individual spores are invisible. You see mold only once a colony forms, as spots, streaks or patches that look fuzzy, slimy or powdery. Colour proves nothing: mold can be black, green, blue, red, orange, white or grey, depending on the species, its age and what it is eating. Many people mistake early growth for dirt or water staining, which is why it spreads unnoticed.
Mold vs Mildew
The two words get used as though they mean the same thing. Mildew is a surface growth: flat, powdery, usually white or grey, and it wipes off tile and grout. Mold goes deeper. It is irregular in shape, fuzzy or slimy, and it feeds on the material underneath, so surfaces covered in mold begin to rot. Our guide to the difference between mold and mildew has the full comparison.
Identifying Black Mold
Black mold, or Stachybotrys chartarum, is one of the types you do not want. Early growth often looks green or grey in the middle with pale borders, then darkens to deep black and turns slimy. It favours material that has stayed wet for weeks, such as soaked drywall. You cannot be certain by looking, because several harmless species look nearly identical. Only a lab test confirms it. Read more on black mold symptoms, treatment and prevention.
The Three Types of Mold
Mold is grouped into three categories by how it affects people.
Allergenic Molds
The least harmful and the most common. They cause trouble mainly for people with asthma or mold allergies. Examples: Alternaria, Aspergillus, Cladosporium and Penicillium.
Pathogenic Molds
These can cause infections and hypersensitivity pneumonitis, especially in people whose immune systems are already weakened. Examples: Aspergillus fumigatus, Aspergillus flavus, Cryptococcus neoformans and Histoplasma capsulatum.
Toxigenic Molds
These produce mycotoxins and carry the highest risk. Several species of Fusarium, Penicillium and Aspergillus are toxigenic, along with Stachybotrys chartarum.
The Three Levels of Mold Damage
Size decides how a job is handled. Contamination is sorted into three levels by surface area.
- Level 1: 10 square feet or less. Contained, and usually simple to remove.
- Level 2: 10 to 30 square feet. Often a sign of a larger hidden problem underneath.
- Level 3: 30 to 100 square feet or more. Growth is widespread and needs professional removal to avoid health and safety risks.
Not sure which level you have? Describe what you see through our contact page and we will tell you.
Where Does Mold Grow?
Mold grows wherever moisture collects. In Winnipeg homes, the same places come up year after year.
- Bathroom tile, grout and the wall behind the shower surround
- Kitchens, under the sink and behind the dishwasher
- Basements, especially after spring melt or a sewer backup
- Attics with poor ventilation
- Garages, bedrooms and living rooms with damp exterior walls
It also settles into carpet, furniture, upholstery, fabric, washers and dryers, air conditioners, furnaces and air ducts.
The bigger risk is the mold you cannot see. It grows behind walls, under floorboards and inside vents, spreading for months before anyone notices an odour. Winnipeg makes this worse twice a year: water in basements every spring, then a sealed-up house all winter, trapping humidity indoors.
Health Effects of Mold
Mold produces allergens, irritants and, in some species, mycotoxins. Breathing them in can cause reactions that range from mild to serious. Common reactions include:
- Sneezing, and a runny or stuffy nose
- Red, itchy or watering eyes
- Skin rash
- Headaches
- Coughing
Heavier or longer exposure can bring harder symptoms, including difficulty breathing, worsened asthma, sinus problems and hypersensitivity pneumonitis. People with weakened immune systems can develop fungal infections.
Infants and young children, older adults, people with asthma or allergies, and anyone who is immune compromised react sooner and more strongly. If symptoms in your household will not clear up, speak to a doctor. We remove the mold; a health professional handles the health side. There is more in our article on the health effects of mold exposure.
Mold Removal vs Mold Remediation
The two words get used interchangeably, and they should not be. Removal means physically taking the mold out: cutting away contaminated drywall, cleaning surfaces, clearing spores from the air.
Remediation is the whole job. It finds the moisture source, contains the work area, removes the mold, dries the structure, restores what was damaged, and stops the problem returning. Removal without remediation is a temporary fix, because the water never left.
DIY or Professional Mold Removal?
Size decides. A patch under 10 square feet on a hard, non-porous surface is usually safe to clean yourself. Anything larger, anything inside drywall or insulation, and anything you suspect is toxigenic belongs with a professional. Scrubbing a colony also throws spores into the air, so one patch becomes three rooms.
How to Clean a Small Patch Safely
- Wear an N95 mask, goggles and gloves.
- Open a window or run a fan venting outdoors, so spores do not travel through the house.
- Seal the doorway with plastic sheeting to keep spores in one room.
- Clean hard surfaces with a mold-killing product made for the job.
- Throw out soaked porous materials such as carpet, ceiling tile and drywall.
- Dry the area completely, then fix whatever let the water in.
If the patch keeps returning after you clean it, stop. Recurring mold means the water source is still active. Call (204) 789-1514 and we will find it.
Two Mistakes to Avoid
Never Use Bleach
Bleach lightens mold on the surface, so it looks like it worked. It does not reach growth inside wood or drywall. It is also mostly water, and that water soaks into porous material and feeds the colony.
Never Paint Over Mold
Mold-resistant paint stops future growth on a clean surface. It does nothing to mold already there. Painting over a patch hides it for a few months while it keeps eating the wall.
The Professional Mold Removal Process
Certified technicians work to a checklist so nothing gets missed. The job runs in four phases.
1. Mold Assessment
- Air quality testing and mold testing
- Identifying the type of mold present
- Locating the source: a leak, a flood or poor ventilation
- Recommending a treatment plan
2. Water and Mold Removal
- Taking humidity and moisture readings
- Containing the area so spores do not reach clean rooms
- Removing standing water before it causes more damage
- Clearing airborne contaminants with air scrubbers
- Removing visible mold by hand, using antimicrobial treatment
3. Drying and Cleaning
- Drying the structure with dehumidifiers, fans and scrubbers
- Bringing moisture down to a level where mold cannot return
4. Prevention and Restoration
- A written report on what caused the mold
- Maintenance advice so the problem does not repeat
- Repairing water and mold damage, and safely disposing of anything beyond repair
Our technicians are IICRC certified, we answer calls 24/7, and we work directly with insurance companies. The full sequence is in our 8 step guide to the professional mold removal process.
How to Prevent Mold
Prevention costs less than remediation every time.
- Keep indoor humidity low. A dehumidifier in the basement does a lot of work.
- Fix leaking pipes, roofs and windows fast. Leaks cause most household mold.
- Dry anything wet within 24 hours, including carpet, drywall and furniture.
- Take laundry out of the washer right away.
- Run bathroom and kitchen exhaust fans, and vent the dryer outdoors.
- Open windows when the weather allows, to move air through the house.
- Vacuum with a HEPA filter to pull spores out of carpet and fabric.
- Book a mold inspection once a year, especially if your basement has flooded before.
Before you spend a weekend guessing, get an answer. Call (204) 789-1514 and book an inspection.
Talk to Mold Removal Winnipeg
Mold does not clear up on its own. If you have found growth, smelled something musty, or had water in the basement this spring, get it looked at while it is still small. Our certified team answers 24 hours a day and works with your insurer. Call (204) 789-1514 or reach us through our contact page.
