The best was to prevent mould in your home is to keep it dry. Periodically check for leaks or damage: gutters, down-spouts, roof or exterior wall damage, missing shingles, check around appliances for leaks, be alert for signs of a leak inside of a wall or ceiling. Our homes have many materials that are food for mould, and we keep them at a temperature that mould favours, so the point of control is always: Water. Control the moisture and you will control the mould!