WHY PROPER COMPACTION MATTERS BEFORE LAYING PAVERS
- Paul
- May 22
- 2 min read
Many paving issues begin long before the pavers are installed. Uneven surfaces, sinking pathways, spreading edges, and weed growth are often caused by poor base preparation underneath the paving.
The pathway shown below is a good example of movement caused by an unstable base layer and insufficient compaction.
Why Some Paving Bases Fail
In many low-standard paving jobs, installers use mostly large rubble or loose stones underneath the pavers.
While this may appear stable initially, large stones alone leave significant air gaps and voids underneath the surface. Over time:
the base shifts,
the pavers settle unevenly,
and movement begins to appear.
Without enough smaller particles or fines mixed through the base material, the stones cannot properly lock together during compaction.
Why We Use Crushed Base with Fines
At PrimeHousePro Services, we prefer using properly graded base materials such as:
road base,
dolomite,
crusher dust,
and compactable rubble blends containing fines
.
These mixes contain:
larger crushed particles for strength,
and smaller particles/sand-like fines that fill the gaps between the stones.
This creates:
tighter compaction,
stronger interlock,
reduced movement,
and a far more stable foundation long term.
Large Stones Only
Large gaps remain underneath.
O O O
O O
Crushed Base with Fines
Smaller particles fill voids and lock together under compaction.
Oo.oOOo.o
oOO.oOoOo
Why Compaction Must Be Done in Layers
Another major issue occurs when too much rubble is placed at once.
If 150–200 mm of material is dumped and compacted in one pass:
the top may feel hard,
while the lower section remains loose underneath
.
This eventually causes:
sinking,
movement,
and uneven paving.
Professional paving preparation is completed in compacted layers, typically:
50–75 mm at a time,
with moisture added where needed,
before the next layer is installed.
This process:
removes air pockets,
improves density,
and distributes loads evenly across the surface.
A Proper Paving Preparation Process
A quality paving installation generally includes:
Excavation to correct depth
Installation of compactable rubble/base in layers
Plate compaction between layers
Screed sand preparation
Paver installation
Final compaction and joint filling
Built to Last
Good paving is not just about how the finished surface looks on day one — it is about how well the foundation underneath performs years later.
Whether it’s:
pathways,
patios,
retaining wall surrounds,
or driveways,
Proper preparation and layered compaction are what help prevent future movement and costly repairs.
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