Drainage
It is important that water does
not lie against the base of walls. The surrounding paths and
ground levels should be sloped to carry water away from the walls.
Ensure downpipes do not expel stormwater onto lower walls or
ground levels. Instead it should be carried away by a drainage
pipe to the stormwater outlet. The ground levels may also need to
be lowered to expose a buried damp proof course system.
Sometimes this becomes a difficult task especially in old city
areas where there has been a progressive build-up of road
pavements. The buildings in these areas are left in low-lying
ground levels surrounded by what is effectively known as a 'levee
bank'.
Solution
1/ Excavate soil to a safe depth, exposing
under the lower wall level.
2/ Clean
wall thoroughly from soil and debris.
3/ Apply 1
coat of Polyurethane Rubberised Membrane with full reinforcement.
4/ Apply 2 coats of Polyurethane Rubberised Membrane.
5/ Install membrane protection board.
6/ In the trench, place a layer of blue metal and install
Agricultural pipe with a fitted sock.
7/ Connect pipe to stormwater outlet.
8/ Cover
pipe with second layer of blue metal.
9/ Backfill
soil.
(retaining walls have the same specs but have a Forticon plastic
installed when 3rd coat of membrane has cured.)
Tanking
Tanking is used on basement walls
and areas where there is a high external soil build-up,
where
excavation and drainage access is denied. This procedure is used to
prevent water
from penetrating through the wall.
Properties:
-
high
strength rubberised cement coating.
-
excellent
adhesion
-
increased
bond strength
-
can be
applied to damp surfaces
-
can be
rendered or painted over.
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