Condensation occurs where moist air comes into contact with air or surfaces that are a lower temperature. Condensation is generally noticeable where it forms on non-absorbent surfaces, like on windows or tiles, but it can form on any surface. It may not be noticed until mould starts to grown or the material rots.
Without condensation control, mould spores known as allergens can become airborne with the slightest disturbance. The microscopic spores are then inhaled and can trigger respiratory problems such as asthma, dust allergies and hay fever.