Condensation
When water condenses on cool exterior walls, it is absorbed by the building material. This reduces the temperature of the wall causing futher condensation to form which sets in motion a cycle which can ultimately result in structural damage.
Most water absorbent materials are also susceptible to damaging mould growth.
Storage
Many products and even their packaging are damaged as a reslut of excess humidty. Condensation and dampness can form in the same way it does on walls and some products, electrical components for example, absorb moisture straight from the air.
Environmental Control
A damp atmosphere is unhealthy and unpleasant and in extreme cases can lead to absenteeism amongst staff as conditions such as asthma can be aggravated by excess moisture in the work place.
Also automated office equipment is more likely to suffer feed problems in conditions of excess moisuture.