During which period was asbestos commonly used in building materials?

Asbestos was widely utilized in building materials before the 1980s due to its beneficial properties, such as resistance to heat, fire, chemical damage, and electrical conductivity. During this time, it was incorporated into a variety of products, including insulation, flooring tiles, roofing, and cement products, as manufacturers sought materials that would enhance durability and safety in construction.

The 1970s marked a significant turning point, as awareness of the health risks associated with asbestos exposure began to grow, leading to regulations and a decline in its use. By the 1980s, many countries had started implementing bans or strict regulations on asbestos-containing materials. Thus, the period before the 1980s is when the heavy reliance on asbestos in building materials occurred, making this the correct answer.