What is a potential hazard of using powder-actuated tools?

Using powder-actuated tools poses a significant hazard because they can cause the material being fastened to fragment into dangerous projectiles upon impact. This is particularly problematic as these projectiles can travel at high speeds and pose a risk of injury to nearby workers or bystanders. The explosive force generated by these tools creates not only a fastening effect but also the potential for shrapnel, emphasizing the importance of wearing appropriate personal protective equipment and ensuring a safe work environment when operating them.

The other options highlight concerns such as noise levels, electric shock, and work efficiency; while these can be relevant factors in a work setting, they do not encapsulate the most critical physical hazard associated with powder-actuated tools, which is the risk of material fragmentation leading to projectiles. Understanding the nature of these hazards is essential for ensuring safety in roofing and construction work environments.