What is the minimum humidity level at which mold can grow?

Mold growth is heavily influenced by environmental conditions, particularly humidity levels. For mold spores to thrive and develop into visible mold, a certain minimum level of moisture is essential. Research indicates that mold typically begins to grow when indoor relative humidity levels reach about 55% or higher.

When humidity is at or above this threshold, it provides the moisture necessary for mold spores to germinate and develop into a mold colony. This threshold is critical in managing environments to prevent mold growth, especially in areas prone to dampness, such as basements, bathrooms, and kitchens.

While lower humidity levels may not support mold growth, they can still create conditions where mold spores survive. Therefore, controlling humidity to remain below this crucial percentage can be an effective strategy for mold prevention.