Why Compaction is Important
While most contractors would never think of constructing a building without properly compacting the surface on which the structure will stand, many disregard the importance of creating a stable surface for their landscape projects.

However, many of the problems associated with failing to place buildings on stable foundations also apply to landscape projects. Interlocking-paver projects that lack proper compaction often become uneven and unstable.

For example, take a driveway constructed with interlocking-paving stones. Without proper compaction, both the sub-base and pavers lack stability, causing shifting and compression. Variables such as the weight of vehicles on the driveway will cause continued shifting and compression, eventually resulting in grooves or ruts in the area of the driveway where vehicles frequently pass.

In addition to the formation of grooves and ruts, other forms of displacement also occur. As poorly compacted pavers and sub-base shift, particular pavers will become higher or lower than others, resulting in an uneven surface. Not only will the surface become unattractive and create problems with stabilization of patio furniture and the like, but it will also create safety hazards by increasing the chances of tripping and falling.

In areas that experience cold temperatures, the freeze/thaw cycle increases the displacement of pavers. Failing to properly compact the surface may result in air voids under the structure and between the interlocking-pavers.  These air voids are potential places for water to settle and freeze as weather turns cold. As the water freezes and expands, it causes  pavers to lift and heave, resulting in an uneven surface.