Dirt Crawl Spaces are great places to live, thrive and reproduce if you're a bug. There is an even temperature, moisture, damp wood and shelter. Spiders, beetles, centipedes, termites, and all kinds of other insects are found in dirt crawl spaces. Animals such as mice (dead and alive) are commonly found in dirt crawl spaces. In some cases, even rats, snakes and small animals have been found.

Mold spores, the seeds of mold, are in the air everywhere. All they need to grow is organic material such as wood, the right temperature range, and moisture. Of these, the only one that can be controlled is moisture.

Dirt crawl spaces have a high humidity levels necessary for mold growth. Humidity levels from 50% to 90% are easily found in dirt crawl spaces that have never flooded.

Mold can grow on dirt, insulation, framing and even under your carpet on the first floor. Mold destroys organic materials as it feeds on them. Mold reproduces by producing millions of floating airborne spores, which some people are very sensitive to. Spores can be dormant for many years, waiting for the right conditions to grow. Some molds produce mytoxins, such as the black mold Stachybotrys. Many articles can be found on the effects of mold, and toxic mold.

Dr. Harriet Burge, an expert in airborne diseases at the Harvard School of Public Health says, "Mold in houses is not a good thing. It could lead to asthma. Houses with mold are damp, and have dust mites and other things in them that can cause illness, especially in children."

Don't panic; there is a solution that will stop your crawl space from being a hospitable environment for mold. Mold will not grow when the humidity levels are reduced below 40%.