Asbestos was commonly used in house construction up until about:

• A. 1980
• B. 1990
• C. 1970
• D. 1960

Answer: (A)

Asbestos was used in house construction for its fire resistance and insulating properties, so it showed up in insulation, pipe and duct wraps, flooring, and some cement products. Health concerns about inhaling asbestos fibers led to regulatory actions and a gradual move away from its use. By about 1980, asbestos-containing materials had largely fallen out of new residential construction, making that year the best approximate point when it was still commonly used. Earlier decades like the 1960s and 1970s saw heavier use, while the 1990s reflect the ongoing shift away from asbestos in new builds; older homes built before these changes can still contain asbestos. This matters in live-fire training because disturbing asbestos-containing materials can release dangerous fibers, so awareness and proper safety planning are essential.