Which types of building materials are most affected by moisture?

The most affected building materials by moisture are wood, drywall, and insulation due to their organic composition and physical properties. Wood is particularly susceptible to moisture because it can absorb water, leading to swelling, warping, and even mold growth if not properly treated or maintained. Drywall, made primarily of gypsum, can deteriorate when exposed to moisture, losing structural integrity and also becoming a substrate for mold growth. Insulation materials can also lose their effectiveness when wet, as moisture can cause them to compact or promote mold, which compromises their thermal properties and overall performance.

In contrast, metal and glass can withstand moisture exposure without significant degradation, though corrosion can affect certain metals over time. Concrete and brick are more durable but can suffer from issues like efflorescence or spalling when moisture penetrates. Lastly, PVC and rubber materials typically resist moisture well and are often used in construction to prevent water-related problems. Thus, the combination of susceptibility to damage and potential health risks like mold growth makes wood, drywall, and insulation particularly vulnerable to moisture issues.