The material has not dried at all, which is somewhat disheartening. So, now the project and the MIPs’ are starting to ask questions. The restorer responsible for counting the grains would likely be perplexed, as the conditions appeared to be quite favorable with warm air, lowered relative humidity, and decreased humidity ratio. Thus, one may wonder what the issue could be.

Have you managed to identify the root cause?

To solve this issue, it is crucial to determine the dew point temperature of the drying chamber’s surroundings. In this case, the plywood’s surface was cold enough to cause water to condense from the air, making it more humid despite the air becoming drier. Ignoring this situation could prolong the restoration process until the crawl space naturally warms up in the spring, raising the temperature of the plywood. Simply counting grains cannot assess our expertise and could result in ineffective drying techniques.

Grain counting is a valuable technique for determining the amount of moisture in an environment only. This technique is commonly used to calculate the moisture removal rate of dehumidification systems. By quantifying the vapor being processed through the system, it is possible to determine if there is a difference in humidity ratio (GPP) between the air stream entering and leaving the system. This difference is called “grain depression” and is a reliable metric for evaluating the system’s performance.


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