Which building material is most likely to support mold growth?

Wood and drywall are the most likely building materials to foster mold growth due to their organic composition and absorptive qualities. Both materials can retain moisture, which serves as a critical factor for mold development.

Wood is particularly susceptible because it is a natural material that provides the necessary nutrients for mold spores to thrive. When wood becomes damp, either from water damage or high humidity levels, mold can quickly establish itself.

Drywall, typically made of gypsum sandwiched between layers of paper, also presents a favorable environment for mold. The paper face of drywall can absorb moisture, while the gypsum core can remain damp for extended periods, allowing mold spores to germinate and proliferate.

Mold is less likely to grow on materials like plastic and glass, which do not retain moisture and provide little to no nutritional value. Similarly, tile, metal, concrete, and stone surfaces are generally more resistant to mold due to their non-porous properties, which do not support the sustenance of mold growth as effectively as wood and drywall do.