What is a reason for ensuring surfaces are free of contaminants before fireproofing?

Ensuring surfaces are free of contaminants before applying fireproofing is crucial for improving the adhesion and performance of the fireproofing material. When surfaces are clean, the fireproofing material can bond more effectively, which enhances its ability to withstand fire and provides the necessary protection for structural elements. Contaminants such as oil, dust, or moisture can create barriers that weaken this bond, leading to potential failure of the fireproofing system during a fire event.

This emphasis on clean surfaces not only ensures that the fireproofing works as intended but also contributes to the durability and longevity of the material, allowing it to perform optimally in its protective role against fire. Proper surface preparation is a critical step in the application process, reinforcing the significance of a clean substrate in achieving the desired fire resistance ratings.