Key takeaways
- Vents let humid air in during summer
- Sealed spaces control humidity more reliably
- Local rules and climate matter
- A professional assessment helps you choose
For decades, builders vented crawl spaces on the idea that airflow would dry them. In many climates, the opposite happens.
The problem with vents
Warm, humid air flows in through the vents and meets cooler surfaces such as joists, ducts and soil. The moisture condenses and the space stays damp, especially in summer.
What sealing does
Closing the vents, covering the soil and managing humidity keeps outdoor air out and the indoor space stable. In humid and mixed climates, this is often the better path.
Check your local rules
Codes and conditions vary, so we look at your climate, your soil and your house before recommending one approach.
Related services
Questions about your own crawl space? Call or text 800-224-9245, or use the quote form below.