In what type of constructions is lead most commonly found?

Lead is most commonly found in structures built before the 1950s due to its widespread use in various building materials during that time. This includes lead-based paints, which were commonly used until the late 1970s when regulations were put in place to limit its use owing to health risks. Additionally, lead was used in plumbing, solder, and older roofing materials, further increasing the likelihood of its presence in buildings constructed prior to this era.

On the other hand, buildings from the 1980s, residential buildings from the early 2000s, and commercial buildings built after 1970 generally incorporated newer materials and techniques that reduce or eliminate the use of lead, reflecting evolving health and safety standards.