283757893275

Patented protection
board bonded with
adhesive to Bituthene
sheets
Surface of wall primed
ready to receive
adhesive Bituthene sheets
Bituthene sheets
lapped by a minimum 300 mm
at any joint
Water bar (waterstop)
cast into construction
joints
Reinforced structural concrete
basement walls
Hydrostatic pressure simply
pushes the tanking harder onto
the structural concrete
Floor tanking sheets lapped
upwards 300 mm at vertical
joints and wall tanking lapped
horizontally for 300 mm
Additional reinforcing strips
placed to ensure joints are
sealed
Tanking lapped in
multiple layers at
all joints
Fillet, multiple lap
formed at junction
50–75 mm concrete blinding
provides a clean working surface
and level platform onto which the
tanking can be applied
Figure 3.62 Type A: external basement tanking system – with protective board (adapted
from http://www.uk.graceconstruction.com).
Reinforced structural concrete
basement walls
Additives may be used to
increase density, reduce the
porosity and ensure watertight
concrete
Hydrostatic pressure resisted
by dense waterproof concrete
Water bar (waterstop) cast
into construction joints
Figure 3.63 Type B: waterproof concrete basement.
50 mm concrete blinding
provides a clean working
surface for positioning
reinforcement, also prevents
concrete seepage from
structural slab