Free tool
Moisture Risk Meter
Enter the weather and the crawl space and see the humidity, the dew point and the risk of condensation.
A planning guide from the physics of humid air, using a standard dew point formula. Real crawl spaces also gain moisture from soil and leaks, so we measure before we advise.
How to use it
Three quick steps
- 1Enter the weatherOutdoor temperature and humidity.
- 2Describe the spaceAir temperature and vented or sealed.
- 3Read the dialSee humidity, dew point and the verdict.
Questions
About the moisture risk meter
Is this exact?
It is a planning guide that uses a standard dew point formula. Real crawl spaces also gain moisture from soil and leaks, so we measure before we advise.
Why does a vented space show high humidity?
Warm, humid outside air cools when it enters the space, and cooler air has a higher relative humidity.
What humidity should I aim for?
Many aim for the 40s to 50s percent. Mold generally likes more than about 60 percent.
Next step
Services that go with this tool
Moisture and Humidity TestingReal numbers for humidity in the air and moisture in the wood, so decisions are based on data.See the service 
Foundation Vent SealingOpen vents let humid air and pests in. Sealing them is a key step in drying the space.See the service 
Crawl Space Dehumidifier InstallationA dehumidifier made for crawl spaces, sized to the space and set to drain on its own.See the service Find out what is under your house.
Call or text, or send the form for your free estimate. Tell us what you notice, from smells and cold floors to water and sagging.