Join Date: Jul 2007
Location: Northport, NY
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Re: Winter has arrived
I had no idea that mould and mildew was such a pervasive problem and required such extensive measures to combat it on boats as it seems in this thread.
"Mildew requires certain factors to develop. Without any one of these, it cannot reproduce and grow. The requirements are
a food source (any organic material)
sufficient ambient moisture (a relative humidity of between 62 and 93 percent)
a reasonable warmth (77 °F (25 °C) to 88 °F (31 °C) is optimal, but some growth can occur anywhere between freezing and 95 °F (35 °C))
Slightly acidic conditions are also preferred. At warmer temperatures, air is able to hold a greater volume of water; as air temperatures drop, so does the ability of air to hold moisture, which then tends to condense on cool surfaces. This can work to bring moisture onto surfaces where mildew is then likely to grow (such as an exterior wall). Preventing the growth of mildew requires a balance between moisture and temperature either in such a way that minimal moisture is available in the air and the air temperature is low enough to inhibit growth (at or below 70 °F (21 °C) without causing condensation to occur, or in such a way that warmer air temperatures, without an actual change in the amount of water vapor in that air, is by its nature "drier" (has a lower relative humidity) than cooler air and will tend to inhibit mildew growth in this way[clarification needed]. Warm temperatures coupled with high relative humidity set the stage for mildew growth.
Air conditioners are one effective tool for removing moisture and heat from otherwise humid warm air. The coils of an air conditioner cause moisture in the air to condense on them, eventually losing this excess moisture through a drain and placing it back into the environment. They can also inhibit mildew growth by lowering indoor temperatures. In order for them to be effective, air conditioners must recirculate the existing indoor air and not be exposed to warm, humid outside air. Some energy efficient air conditioners may cool a room so quickly that they do not have an opportunity to also effectively collect and drain significant ambient water vapor."
pay attention... someone's life depends on it