Crawl Space Repair - Testing the humidity in the crawlspace air

DryZone team members will generally say that 55-65% humidity is as high as you want to see in a crawlspace. In the summer, there will be an occasional spike, but for the most part it will stay in that range after our CleanSpace system is installed. In this picture you can see a relative humidity reading of over 91% which is ridiculously high. You can't get much higher than that, after all the scale only goes to 100. Around 90% means that the air ducts are probably causing a lot of condensation. The cool air passes through the hot, moist air and drops of water form on the ducts. If you look at the bottom of an air duct in these conditions, you will see something very similar to rain in your crawlspace. That's scary!