How to detect and get rid of mould

Poorly controlled moisture can cause the growth of moulds. In addition to damaging materials, these microscopic fungi are harmful to your health. It is important to learn to recognize the presence of mould to be able to eliminate it quickly and completely.

Where can I find mould?

Wherever there is moisture. Water coming in through the floor, walls or roof is particularly likely to increase the presence of moulds. The same is true for plumbing leaks or poor ventilation in the bathroom, kitchen or laundry room. Beware also of standing water in a dehumidifier or air conditioning unit.

Moulds can grow and accumulate on various materials such as wood, cardboard and plasterboard. In the presence of moisture, window sills, bathtub rim, carpets, walls and ceilings must be inspected. Do not overlook closets where air does not circulate freely.

How can I tell if it is mould?

Material discoloration or stains can be signs of mould. To be sure, simply dab a drop of chlorine bleach onto a suspected spot: if the stain loses its colour or disappears, then it is probably mould. Don’t look only for black spots as moulds can range in colour from yellow, white, violet, blue, orange, and even red.

Your nose can also help you detect the presence of mould. A musty, earthy or even alcohol smell is a good indication. Watch for rings and bulges: fungi can be hidden in the materials behind walls and ceilings.

Should I seek professional help?

Not necessarily. According to the Canada Mortgage and Housing Corporation (CMHC), when the affected area is no larger than a square meter, you can very well clean and eliminate the mould problem yourself. If the mould area exceeds one square meter, assessment by a professional is recommended. Seek professional help if your house is still very damp and mould grows back despite repeated cleanings.

How do I get rid of mould?

Simply clean the area where mould is growing:

Mix water and an unscented detergent solution
Scrub the surface with a clean, wet rag<
Dry quickly and completely

All through this operation, be sure to wear a disposable dust mask and household rubber gloves. Pregnant women, infants or any person with asthma, allergies or other health problems should keep away from the work area.

To prevent mould from reappearing, find and fix water leaks and monitor the moisture level in your house using a hygrometer. Relative humidity should not exceed 45% in winter. Use a dehumidifier, if necessary.

A mould problem can, by itself, compromise the quality of the air in your home and cause serious health problems. Mould control is relatively simple: eliminate moisture as it is produced (using exhaust fans for example) and clean and maintain your home regularly.