283757893275

Where the ground is
susceptible to heave
precautions should be taken
Voids should be left below
floor slabs and compressible
material should provide a barrier
between the soil and foundations
Void 125 – 300 mm
Backfill
Compressible material or
void former to the inside
face and underside of the
ground beam
Prevents the beam lifting or
moving when the clay expands
Slip liner can be
used around pile
Figure 3.14 Precautions against heave: pile and ground beam.
Where the ground is
susceptible to heave
precautions should be taken
Voids should be left below
floor slabs and compressible
material should provide a
barrier between the soil
and foundations
Void 125 –300 mm
Backfill
Backfill
Where trench fill is greater
than 1.5 m deep, a compressible
material or void former should
be used against the inside
face of the foundation,
positioned in accordance with
manufacturer’s instructions
Prevents the foundation
being pushed outwards
500 mm
Figure 3.15 Precautions against heave: trench fill.