What is the best method to achieve adhesion of stone aggregate during a flood coat?

Applying the aggregate immediately after the bitumen is poured is the best method to achieve adhesion because the hot bitumen creates a tacky surface that allows the aggregate to bond effectively. When the bitumen is still hot and fluid, it has optimal adhesion properties, ensuring that the stone aggregate is embedded properly just before it begins to cool and harden. This method promotes a strong mechanical bond that enhances the overall durability of the roof surface.

If the bitumen were allowed to cool completely, it would lose its adhesive qualities, making it difficult for the aggregate to adhere. Sprinkling the aggregate onto dry bitumen would also lead to poor adhesion since the bitumen needs to be in a tacky state to secure the stones effectively. While a mechanical spreader can assist in uniform distribution, the timing of applying the aggregate is critical for achieving the best bonding results. Thus, the correct application timing directly influences the performance of the flood coat.