Humidity vs. Dew Point

By July 18, 2017 August 23rd, 2017 No Comments

Humidity vs. Dew Point

All throughout the crawl space industry, you will hear concerns of “High Humidity” and of the numerous products triggered to operate solely based on a single humidity reading. Humidity is important to understand, but it only tells part of the story of what is going on in a crawl space.

Why does ATMOX focus on dew point?

  • Humidity is measured as a percentage (rH%). The R is important as it stands for the relative temperature.  Humidity levels can vary greatly as temperature changes.
  • Dew point is measured as a temperature in degrees.  This is an absolute measure of the water vapor in the air.  It is the temperature at which the measured air mass would reach 100% humidity and cause condensation as the air can no longer hold all of the moisture.
  • When you ventilate a crawlspace you need to know if the air mass outside is drier than the air in the crawlspace. Since crawlspace temperatures are typically much colder than outside summer temperatures, humidity measurement alone can be misleading.
  • ATMOX also focuses on a comparison of dew point in two locations in order to properly ventilate the crawlspace only when beneficial.

Video: Dew Point Illustration




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Mike Potts

Mike Potts

After graduating from Michigan State University with a degree in structural engineering, Mike moved to Tampa Bay and soon discovered a need in the community for trained, professional inspectors. Using his training in the field, Mike established Affordable Inspections, Inc. in 1992 and began offering his services to the public – inspecting commercial and residential properties. Taking on not just inspections, but full-on construction projects, Mike made a name for himself as an expert in structural engineering and worked on large commercial buildings in Tampa Bay and Clearwater.