Which protective measure reduces ash build-up on roofs?

• A. Steep roofs
• B. Earth embankments
• C. Hazard maps
• D. Evacuation routes

Answer: (A)

Steep roofs are best because they let volcanic ash shed off quickly under gravity. When ash settles on a roof, a steep pitch causes the ash to slide away rather than accumulate, reducing the weight load and the need for frequent cleaning. Flat or gently sloped roofs can hold a thick layer of ash, which adds weight, risks leaks, and can even threaten structural safety if the ash becomes saturated with water. Other measures mentioned have protective roles that don’t directly reduce ash buildup on roofs: earth embankments can divert or shield against certain volcanic hazards, hazard maps identify where ash fall is likely so people know where to avoid, and evacuation routes help people get to safety. But only a steep roof design directly minimizes the amount of ash that stays on the surface.