Key takeaways
- Aim for the middle of the range or lower
- Wood stays safer when humidity stays down
- A small sensor tracks it over time
- A dehumidifier closes the gap when needed
Humidity is the amount of moisture in the air compared with how much it can hold. For crawl spaces, lower is better, up to a point.
A useful target
Many professionals aim for a relative humidity in the middle of the range or lower, often a little under sixty percent. Wood that stays damp for long periods grows mold and decays.
How to measure
A small humidity and temperature sensor in the space shows readings over days and seasons. A single reading tells little, because the number changes through the day.
How to lower it
Cover the soil, seal the vents and add a dehumidifier sized for the space. Our Dehumidifier Sizer gives a starting point.
Related services
Questions about your own crawl space? Call or text 800-224-9245, or use the quote form below.