There are several signs that indicate a crawl space may be harmful to your home and health:
Musty or damp smell: A musty or damp smell in your home can indicate that there is moisture in the crawl space, which can lead to mold growth.
Visible mold: If you can see mold growing in the crawl space, it is likely that the area is not properly ventilated or insulated, which can lead to mold growth.
Rotting or crumbling wood: Rotting or crumbling wood in the crawl space can indicate that there is a moisture problem and that the area is not properly ventilated.
Pest infestations: Pests, such as termites or rodents, are attracted to moisture and can indicate that the crawl space is not properly sealed.
High humidity levels: High humidity levels in your home can indicate that there is a moisture problem in the crawl space.
Sagging floors: Sagging floors can indicate that the crawl space is not properly supported or that there is a moisture problem in the crawl space.
If you suspect that your crawl space is harmful, it's important to address the issue as soon as possible to prevent further damage and potential health hazards.