In accordance with the United States EPA website
Mold and mildew are usually found on the surface of the outer walls of the corner rooms in heating climate locations. Exposed corner room is considerably colder than adjoining rooms, so it has a high relative humidity (RH) than other rooms at the same pressure of water vapor. If the growth of mold and mildew are located in a corner of the room, the relative humidity near the surface of the room there is a 70%. However, this RH above 70% on the surface because too cold room or because there is too much moisture present (water vapour pressure)?
The amount of moisture in the room can be estimated by measuring the temperature and relative humidity in the same place and at the same time. For example, suppose there are two cases. In the first case, it is assumed that the RH-30% and the temperature is 70oF to leave the room. Low relative humidity at that temperature indicates that the vapour pressure of water (or absolute humidity) are low. The high surface RH is probably due to room surfaces that are "too cold". Temperature is the dominating factor, and control strategies should involve increasing the temperature of the surface of the cold room.
In the second case, it is assumed that the RH-50% and the temperature is 70oF in the room. Higher RH at that temperature indicates that the vapour pressure of water is high and there is a relatively large amount of moisture in the air. The high surface RH is probably due to the air, which "too moist." Humidity is the dominating factor, and control strategies should involve reduction of humidity in the room.
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