What percentage of construction before 1970 contained asbestos in pipe or boiler insulation?

The correct answer indicates that 20% of construction prior to 1970 contained asbestos in pipe or boiler insulation. This figure reflects historical practices in building materials, particularly during a time when the hazardous effects of asbestos were not well understood. Asbestos was commonly used for its fire-resistant properties in insulation materials, especially in pipes and boilers, which were prevalent in many constructions.

By the late 1960s, awareness of the dangers of asbestos exposure began rising, leading to increased scrutiny and regulation. The percentage underscores the substantial presence of this dangerous material in older buildings, emphasizing the need for awareness among workers and the public regarding potential asbestos exposure during renovations or demolitions of such structures. Understanding this statistic helps highlight the importance of safety measures and regulations for workers involved in handling or removing asbestos-containing materials today.