What are two common uses of asbestos in construction before the ban?

The correct answer identifies two specific applications of asbestos that were prevalent in the construction industry prior to the material's ban. Thermal system insulation (TSI) refers to the use of asbestos in insulation for boilers, pipes, and other equipment where heat retention and fire resistance are crucial. Asbestos is known for its ability to withstand high temperatures without degrading, making it an ideal choice for these thermal insulation applications.

Surface materials (SM) include a diverse range of products that often contained asbestos to enhance durability and fire resistance. This category encompasses items like textured ceilings, certain types of flooring, and wall materials. The properties of asbestos helped to improve the performance of these materials, especially in terms of fire resistance and longevity.

These applications highlight the reasons why asbestos was widely used in construction. The combination of effective thermal insulation and enhanced safety measures for fireproofing made it a popular but ultimately hazardous choice in the building industry.