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Infill concrete packing applies
pressure to the tanking, resists
hydrostatic pressure
The internal wall
should remain dry
Internal floor finish;
wearing material
protects tanking
Internal floor applies
pressure to the
tanking and prevents
hydrostatic pressure
lifting
All joints well lapped and
fillet used to prevent hard
corners
Figure 3.60 Type A: internal basement tanking system.
Fillet
Reinforced
structural concrete
basement walls
Infill concrete packing
helps to hold tanking in
place. Hydrostatic
pressure simply pushes
the tanking harder onto
the structural concrete
Water bar often used over
construction joints as a
secondary precaution (not
really necessary with external
tanking)
Tanking lapped in
multiple layers at all
joints
Structural footing to
support external wall
50–75 mm concrete
blinding provides a clean
level platform onto which the
tanking can be applied
Figure 3.61 Type A: external basement tanking system – with blockwork protection.