Compaction is where density is achieved and pavement performance is locked in. Learn why density matters for durability and service life, how temperature, timing, lift thickness, and coordination with paving define the compaction window, and the role each roller plays in the construction sequence. A practical fundamentals session for industry professionals interested in learning more. Attendees will be able to: – Explain why pavement density is critical to durability, permeability, and long-term performance – Describe how temperature, time, and lift thickness impact the compaction window – Identify the types of rollers utilized within the compaction process and their roles – Recognize how consistent operations support uniform density and acceptance requirements.