Even though flow fill is poured as a virtual liquid, it sets up hard in just a few hours. It can be paved over at that time. Because no compaction is required, there are a number of benefits. First, trenches can be more narrow. Trench width is driven wider to accommodate the width of compaction equipment. With no compaction needed, then there are no workers require to run and support compaction equipment. There is no time set aside for compaction. Jobs are faster, safer and done better.