When and How to Compact
Making the decision to compact is important, but equally important is ensuring that proper compaction techniques are used. Failure to use proper compaction techniques will lead to many of the same problems associated with not compacting at all.

Sub-base should be placed in 4- to 8-inch lifts with compaction occurring after each lift.

Initially, any project begins with excavating the area for the pavers. Excavation is typically between 8- and 12-inches deep depending on the type of paver used and the purpose of the finished project.

While many contractors avoid compaction following the excavation stage, it is important to ensure that the sub-base is being placed on an even and solid surface. It is a good idea to go over the surface three to four times with a plate compactor before introducing the sub-base material.

Once the surface of the excavated area is sufficiently compacted, sub-base material may be added.  Typically, a limestone or sandstone sub-base should be placed in 4- to 8-inch lifts with compaction occurring after each lift. Proper compaction should be achieved in three to four passes per lift with a plate compactor. Specific recommendations on the number of required passes for a particular job can be obtained by contacting the equipment manufacturer or local distributor/rental house.