What should be ensured when overlapping hot material onto a cold mat?

When overlapping hot material onto a cold mat, it is crucial to ensure that the overlap provides adequate material for compaction. This is important because proper compaction is key to achieving a strong, durable pavement. If there is insufficient material during the overlap, it could lead to weak spots that may not hold up against traffic loads and environmental conditions. Adequate material in the overlap area helps to ensure that the layers bond properly, improving the overall integrity of the pavement structure.

This approach ensures that the transition between the new hot mix and the existing cold mat is effectively managed, supporting proper temperature and density during compaction. A well-compacted overlap minimizes the risks of delamination or failure at the joint, ultimately leading to a longer-lasting surface.