Construction

Introduction
Page
2
Advantages & Disadvantages
3
Product Specifications
4 – 20
Guidance Notes
21 – 26
Membrane Installation
27 – 41
Sika Sump Pump Installation
42
Sika Battery Back-up Pump Installation
43
Sika Channel Installation
44 – 45
Photograph illustrations
46 – 75
Sketch Drawing Details
76 - 82
(Internal basement application – Standard, HD20)
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Sika Cavity Drain membranes ‘C.D. System’ are made of high-density
polyethylene and polypropylene studded sheets, which are impervious to
water and are vapour proof. When placed against structures the studs
form permanent cavities between the structure and the internal shell.
They can be used internally or externally to drain and control water &
damp ingress.
Sika C.D. System is not a tanking system. The term “Tanking”
originates from the industrial process of lining structures with a
waterproof material, which were applied either externally (on the positive
side) or internally (on the negative side). Tanking materials such as
multi-coat renders, cementitious waterproofing slurries, asphalt’s and
liquid applied bitumen coatings, to name but a few rely on either a
mechanical or chemical bond directly on to the substrate and work by
holding water back. The majority of which are vapour permeable.
Walls in the majority of circumstances are not engineered to withstand
Hydrostatic Forces applied when a negative pressure barrier tanking
system is used to hold back water pressure. Brick is very strong in
compression but weak in tension.
Traditionally in the United Kingdom cementitious tanking systems are
applied to below ground structures, but if the structure was to be
subjected to hydrostatic water pressure, the resulting bending stresses
are often far to great for the barrier system to cope with and therefore debonding or cracking, resulting in failure, will occur. The installation of
Sika C.D. membrane doesn’t change the status quo and therefore Sika
Cavity membranes are ideally the most suitable and economical method
of providing an effective and long lasting waterproofing system that is
also sympathetic towards building structures and for those seeking
maximum assurance Sika C.D. System is considered to be the most
trouble free when considered for use in basements incapable of
withstanding additional hydrostatic pressures.
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One of the main advantages of Sika Cavity Drain membranes over
cementitious systems is that they do not stop water at the point of entry,
so hydrostatic pressure is not increased any more than it would be
without a waterproofing system.
Because the status quo is not altered, stresses are not induced in the
substrate other than those, which would be induced anyway. For this
reason, it is often possible to retain substrates, which would have to be
replaced when using a cementitious system, and yet still comply with
BS8102.
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The main disadvantage of Sika Cavity Drain membrane is that they are
incapable of accepting any hydrostatic water pressure, unless a water
drainage facility is incorporated within the system such as natural or
pumped drainage.
Cavity Membrane should therefore never be used in a below ground
situation without a drainage facility, otherwise the Cavity Membrane
system will fail at some stage.
Sika Cavity Drain membranes should not be used under flat soffits,
without creating some sort of fall.
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Sika Cavity Drain Membranes:
• Sika Standard drainage membrane
• Sika HD 20
• Sika Plaster drainage membrane
Sika Fixing and Sealing Components:
• Sika Masonry Plug
• Sika Plaster Plug
• Sika C.D. Rope
• Sika C.D. Tape
• Sika C.D. Corner Seal
Sika Drainage Products:
• Sika C.D. Pump Kit (single sump & pump kit with alarm)
• Sika C.D. Battery Back-Up Kit
• Sika C.D. Channel
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Sika Standard Drainage Membrane is manufactured from translucent
polypropylene. It is impermeable and resistant to the usual chemicals in
building construction.

When Sika Standard Drainage is acting as a damp proof membrane,
both the product and the wall and floor coverings may be installed
independent of the moisture content in the underlying structure and with
running water not under pressure in the air gap.
Studs are formed in a regular pattern on one face of the membrane. The
studs are round and spaced at 20mm centres. Sika Standard Drainage
Membrane is supplied in rolls 2.05m x 20m.
*

Sika Standard Drainage Membrane is tough but pliable and can be bent
round corners and projections without risk of breaking even in very low
temperatures. The Membrane can be easily cut with a knife and scissors.
Rolls of Sika Standard Drainage Membrane should be stored upright.
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Dimension:
Raw Material:
Colour:
Stud Height:
Membrane Thickness:
Weight:
Loading Performance:
Water vapour resistance:
Air Gap Volume:
Filling Volume:
Biological resistance:
Chemical resistance:
Thermal resistance:
Flammability:
$
*
Roll 2.05m x 20m
PP (Polypropylene)
Translucent
5mm
0.5mm
480 g/m²
Defined by floor covering
Approx. 1800m².s.Gpa/kg or 360n
equivalent air layer
3.3 l/m²
1.7 l/m²
Does not rot or support growth
Resistant to all chemicals in normal building
construction
0.10 m².°K/W
B2
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The Sika HD20 Membrane is manufactured from black high-density
polyethylene (PEH). It is impermeable and resistant to most chemicals
found in the building construction (see details below).
When the product acts as a damp proof membrane, both the product and
floor coverings may be installed independent of the moisture content in
the underlying concrete construction and with running water not under
pressure in the air gap.
Studs are formed in a regular pattern on the one face of the Membrane.
The studs are spaced at approx. 60mm centres. The product is supplied
in rolls 2m wide x 20m length.
*
The Sika HD20 Membrane is tough but pliable and can be bent round
corners and projections without risk of breaking even in very low
temperatures. The Membrane can be easily cut with a knife or scissors.
Rolls of Sika HD20 Membrane should be stored upright.
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Sheet Thickness:
Stud Height (net):
Unit Weight:
Tensile strength at yield:
Elongation at yield:
Max. Compressive strength:
Deformation under long term load:
Working Temperature:
Softening Temperature:
Linear Coefficient of thermal expansion:
Life Expectancy:
Thermal Resistance:
Water Vapour Resistance:
Drainage Capacity:
Air Gap Volume:
Colour:
Nominal 1.00mm
approx. 20mm
0.95 kg/m²
at least 10 N/mm²
at least 15%
150 kN/m²
max. 10% (load of 50 kN/m²)
-50° to +80°C
+125°C
0.13mm/m.°C
at least 50 years for defined
applications.
0.17m².°C/W
3500m².s.Gpa/KG
Max. 13 l/sm
14 litre/m²
Black
.
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The Sika HD20 Membrane is resistant to most chemicals to which it can
be exposed, in normal building construction. A small number of
aggressive chemicals (e.g. solvents) in large concentrations, can to
some extent attack the Sika HD20 Membrane during prolonged
exposure. If the product is to be applied, for example as cladding to
storage tanks for aggressive chemicals, the supplier should be
contacted, with a view to assessing necessary action.
For normal applications of the Sika HD20 Membrane, relevant
aggressive chemicals are very volatile, because of their very nature. This
means that if they should come in contact with the Sika HD20
Membrane, following an accident, they will evaporate of flow away from
the construction without permanent damage occurring.
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Sika Plaster Drainage Membrane is manufactured from natural high
density polyethylene (PEH). It is impermeable and resistant to the usual
chemicals in the building construction. The product acts as a damp proof
membrane and key for the direct application of cement render or plaster.
(Contact Sika Technical Department for further advice).

The product and render or plaster may be installed independent of the
moisture content in the underlying substrate.
Studs are formed in a regular pattern on the one face of the product, and
form undercut cavities creating a key for render and plaster. The studs
are spaced at approx. 35 mm centres. The product is supplied in rolls of
20 m in length.
*

Sika Plaster Drainage Membrane is tough but pliable and can be bent
round corners and projections without risk of breaking even in very low
temperatures. The product can be easily cut with a knife or scissors.
Rolls of Sika Plaster Drainage Membrane should be stored in unbroken
packaging and upright, and preferably under cover, when stored over
long periods.
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Sheet thickness:
Stud height(net):
Unit weight:
Working temperature:
Softening temperature:
Linear coefficient of thermal expansion:
Thermal resistance:
Water vapour resistance:
nominal 0.50 mm
approx. 5 mm
0.48 kg/m2
- 50° to +80°C
+125°C
0.13 mm/m.°C
0.10 m2.°C/W
1800 m2.s.GPa/kg
or 350 m equivalent air layer
Air gap volume:
3.2 liter/m2
Drainage capacity (transmissivity, i=1): max. 1.84 l/sm
Life expectancy:
at least 50 years for defined
applications
Colour:
Natural
.
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Sika Plaster Drainage Membrane is resistant to most chemicals, to
which it can be exposed, in normal building construction.
A small number of aggressive chemicals (e.g. solvents), in large
concentrations, can to some extent attack Sika Plaster Drainage
Membrane during prolonged exposure. If the product is to be applied, for
example as cladding to storage tanks for aggressive chemicals, the
supplier should be contacted, with a view to assessing necessary action.
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Sika Masonry Plug 10x75 mm is a plug of polyacetal (POM) with a
length of 75mm, and is intended for use in soft brick or stone, which is
predrilled a minimum depth of 90 mm from the surface of the Sika
Membrane with a drill bit of diameter 10 mm.

Sika Masonry Plug has a head of diameter 30 mm, which is cone
shaped like the back face of the Sika Membrane'
s stud. This gives an
excellent transfer of loading from Membrane to the base structure.
There is a 5 mm hole in the shank of the plug for fixing the next layer
onto the Sika Membrane, using a screw of diameter 5 to 6 mm, with
screwing-in depth of max. 30 mm.
Sika Masonry Plug is resistant to normally occurring chemicals in the
building construction.
Pack:
Delivery unit
Box of 100
Carton of 4 boxes
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The Sika Plaster Plug is made of Polymer Co Polypropylene with a
length of 70mm. It is intended for use in brick, concrete block and
concrete, which is predrilled to a minimum depth 85mm from the surface
of the Sika Plaster drainage membrane with an 8mm-diameter drill bit.
The head of the Plaster base plug has a diameter of 35mm with an
embossed surface to provide a mechanical key for subsequent
plaster/render. The Sika Plaster plug is resistant to normally occurring
chemicals in the building construction.
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Colour:
Thickness:
Length:
Working Temperature:
Life expectancy:
Chemical resistance:
opaque
8 mm
70mm
- 30°C to + 90°C
At least 50 years
As for Sika C.D. System Membranes
NB the fixing is not suitable for direct, long-term exposure to UV radiation
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• Based on a blend of butyl and other rubbers, this versatile strip
sealant has good tack and adhesion to most common surfaces whilst
having good movement accommodation.
• Standard colour – grey.
) 7
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The following performance data assumes good joint design. For nonstandard situations refer to Technical Services Department.
• Movement accommodation:
±15% when used in lap and cover
joints.
• Adhesion:
has good surface tack and adheres
well to most building materials.
• Shear Strength:
14N.
• Compression (force required to compress by 20%):
200N
Very Good.
• UV light resistance:
• Chemical resistance:
Good to diluted acids and alkalis. Not
recommended for extreme chemical
exposure.
• Service temperature range:
- 40°C to + 110°C.
• Expected life:
The Sika C.D. Tape & Rope is a
durable material and can have a life in
excess of 20 years depending on the
service temperature and joint design.
• Shelf life:
1 year.
• Elongation of break:
220%.
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• Surface preparation:
All surfaces should be clean, dry and
free from frost, grease and loose
material.
• Application details:
Should be applied directly from the
reel onto one surface pressing
sufficiently to ensure adequate initial
adhesion. Remove backing paper
and apply other surface onto Sealing
Tape and Rope pushing firmly to
ensure good contact with full area of
strip along the length of the joint.
• Application temperature range: +5°C to +30°C.
• Priming:
Primers are not required for good
adhesion to most surfaces.
) +
• Sika C.D. Tape is supplied in 20 metre rolls (30mm x 2mm profile).
• Sika C.D. Rope is supplied in 5 metre long rolls x 10mm diameter.
(
.6
7
• There are no known health hazards associated with Sika C.D. Tape
and Sika C.D. Rope in normal use.
• Wash hands immediately after use.
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• Based on a blend of butyl and other rubbers, this versatile strip
sealant has excellent high tack adhesion and will adhere to most
common surfaces whilst having good movement accommodation.
• Standard colour – white adhesive base with aluminium lead look top
surface
) 7
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The following performance data assumes good joint design. For nonstandard situations refer to Technical Services Department.
• Movement accommodation:
±5% when used in lap and cover
joints.
• Shear Strength:
14N.
• Compression to seal:
Positive Pressure
• UV light resistance:
Excellent.
• Chemical resistance:
Good to diluted acids and alkalis. Not
recommended for extreme chemical
exposure.
• Service temperature range:
-40°C to +90°C.
• Shelf life:
1 year.
• Elongation of break:
220%.
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APPLICATION
• Surface preparation:
All surfaces should be clean, dry and
free from frost, grease and loose
material.
• Application details:
Remove backing paper and apply
directly from the reel onto membrane
surface pressing firmly to ensure
adequate adhesion along the length
of the joint.
• Application temperature range: +2°C to +30°C.
• Priming:
Primers are not required for good
adhesion to most surfaces.
PACKAGING
• Sika C.D. Corner Strip is supplied in 10 metre rolls x 150mm wide.
HEALTH & SAFETY
• There are no known health hazards associated with Sika C.D.
Corner Strip in normal use.
• Wash hands immediately after use.
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When installing Sika C.D. System Cavity Drainage membranes careful
attention must be given to provide a suitable drainage solution. Natural
drainage is not normally possible or convenient in below ground
situations, so mechanical drainage must be used.
Sika C.D. Pump Kit is a ready to use complete water control system
principally designed for use in below ground structures to control water
ingress. The system consists of a pre-formed polyethylene sump basin, a
mains powered 240v submersible pump, a non-return valve assembly
and a battery operated high water level alarm, which is linked to an
integral float switch. The Sika C.D. Pump Kit system can be used to dewater the ground or additionally linked to Sika C.D. Channel (see Sika
C.D. Channel Data) relieving water ingress from retaining walls and in
turn pumping out to a suitable drainage point.
,
Sump Basin – The Sump Basin is a polyethylene pre-formed chamber
with a series of perforations around its perimeter. These perforations
relieve ground water pressure, allowing easy access for water to flow into
the sump. The Sump Basin is 560mm high x 460mm diameter and is
most commonly located into the floor, finishing flush with the surrounding
floor level. The Sump Basin is supplied with a structural foam flat lid,
which can accept foot traffic. The lid can be easily removed to allow
regular maintenance of the internal submersible pump or pumps.
Submersible Pump – The pump is positioned within the Sump Basin and
is controlled by an automatic integral float switch. As the water level
increases within the sump the integral float rises and when the pre-set
switch level is reached the pump will automatically operate and
discharge the water. The Pump is 240v and requires wiring into a fused
spur outlet within 1.5m of the pump.
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Discharge Bore
Max. Head
Max. Capacity
Motor Output
Revolution
Max.Width
Max. Height
Weight
,
-
50mm
5.2m
220 litres/min
150W
3000 rpm
226mm
340mm
4.8kg
Non-Return Valve Assembly – To avoid any discharged water backingup into the sump basin, a non-return valve assembly is provided. This is
fitted directly to the submersible pump outlet via flexible couplings and
supplied ready to accept a standard 1½” waste pipe. The non-return
assembly has easy access for cleaning the internal valve.
High Water Level Alarm – The High Water Level Alarm is an essential
component within the Sika Pump System. In the event of mechanical
failure of the pump or an unexpected power failure, the water will
continue to fill the sump. When the water reaches the level of the alarm
float switch, the 80db alarm will sound, giving warning of the failure. The
alarm is powered by a 9v battery, which should be positioned in a
convenient location such as a kitchen/lounge where it will be easily
heard. Once the alarm is heard immediate action must be taken to avoid
flooding. Additionally a 12v battery operated pump can be installed
offering peace of mind to the client, while investigations are made into
the failure. See Sika C.D. Battery Back-up Kit data.
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The Sika C.D. Battery Back Up kit is a 12-volt battery operated pump
system designed for use in conjunction with the Sika C.D. Pump kit. Its
unique design gives the client peace of mind knowing that their water
pumping system can remain operational and their basement can remain
dry, even in the event of a mechanical breakdown of the primary pump
or a temporary power failure.
The battery back-up system consists of a 12-volt battery, a 12-volt pump,
a battery trickle charger, float switch and a compact waterproof housing.
All electrical and mechanical parts are located within the housing, which
is sited away from the sump chamber; this ensures no contamination
from water.
The pump, which is located within the housing, is connected to the sump
chamber by a suction hose. The pump operates when the float switch, in
the sump chamber, is engaged. The pump draws the water from the
sump through the pump and to a suitable drainage point.
The 240v trickle charger maintains the charge in the battery whilst the
mains power is live. In the event of a power failure the charge held within
the battery will operate the pump. When the power is reinstated the
trickle charger will boost the battery back-up to full charge.
During a power failure the expected continual running time of the 12v
pump would be approximately 6.0 hours, but most commonly the pump
would run intermittently for 1 minute at a time. Therefore greatly
extending the functional life.
The 12v pump has a maximum output of 1920 Litres / hour and can
operate in excess of a 6m vertical head.
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Sika C.D. Channel is a P.V.C drainage conduit designed for the control
of water ingress in below ground situations.

Sika C.D. Channel is fitted around the perimeter of the floor at the
vulnerable wall/floor junction.
Sika C.D. Channel can be used in most waterproofing situations, and is
particularly suited for use in conjunction with Sika C.D. Membrane
systems. Water entering the building through the walls is controlled
behind the Sika C.D. Membranes and diverted to the Aquachannel at
the base of the wall. The water enters the Sika C.D. Channel through
pre-drilled 19mm holes drainage holes set 70mm apart along its length
and is then be diverted to a suitable drainage point, either natural or a
sump and mechanical pump (see Sika C.D. Pump Kit). Jetting eyes and
channel to sump connector’s can also be fitted into the perimeter
drainage system to enable the Aquachannel to be cleaned periodically if
necessary.
In situations where an existing floor slab/screed is solid and showing no
signs of water ingress, cracking or de-bonding, the installation of
Aquachannel can eliminate the need for Sika C.D. HD20 membrane on
the floor, proving beneficial in areas of limited headroom.
The application of a liquid waterproof coating to the existing floor would
be recommended to act as a moisture suppressant i.e. Sika Primer MB
two part blue tinted epoxy resin based DPM at a minimum consumption
of 0.5kg / m² in total.
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Properties and structures vary in design and form of construction. Any
specification is therefore unique to individual properties and to any
special or particular circumstances encountered that may relate to the
structure. The guidance notes set out below have been put together as a
'
guide only' in order to help the specifier and membrane installer.
Therefore the information given in this text and that which is provided in
any product data sheet issued by Sika Limited, is made without prior
guarantee, as conditions of use and labour involved are beyond our
control.
6
Membrane Suitability
Sika C.D. System membrane can be applied to almost all sound
building structures below ground, which are affected by dampness or
water ingress. However, they are not recommended for installation in the
following situations.
•
•
•
Where the cavity membrane system cannot be drained, otherwise
the system will fail. (See drainage facilities and guidance notes).
Fixed onto internal flat soffits unless the soffit has an existing fall or
a fall can be formed at the design stage (in the case of new build
construction) or created using sand & cement renders, otherwise
water would pond behind the membrane and build up like a
balloon. The weight of water would inevitably burst the membrane
seals, which are not designed to hold water under pressure.
Under or on top of concrete/stone staircase treads & risers,
because of the many complicated junctions and angle details. In
such circumstances, we recommend they be treated independently
using an epoxy vapour barrier i.e. SikaGard 62, Sika Primer MB.
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
Ingressing Water
Sika C.D. System cavity membranes are capable of dealing with
reasonable volumes of water (see separate technical information
sheets), so ingressing water will not usually require remedial action. But
if the flow rate is such that it will be able to carry silts / dissolved lime with
it, then this inflow should be stemmed / controlled prior to fitting the
membrane. This can be achieved as follows.
•
If ingressing water is localised then the application of Sika-4a
Waterplug may be required (see technical information sheets)
When water is flowing through concrete or mortar (particularly when it is
new) there is a tendency for dissolved lime to be brought into the cavity.
This lime can then come out of solution and block up cavities and drains.
If this is a risk, then the source of water ingress needs to be treated in
the same way as silt bearing water, as described above.
NB Regardless of conditions at the time of inspection, BS 8102 states it
must be assumed hydrostatic pressure will occur at some time during the
lifetime of the basement. This means that some form of water removal
system must always be fitted with the Sika C.D. System in below
ground structures.
Drainage Types
There are two principle forms of drainage, these are Natural (gravity) and
Mechanical (Sump & Pump) and can be used in conjunction with falls or
drainage channels. However, when assessing the type of drainage
facility to be used and because the drainage is the key to the success of
the cavity membrane system, it is important to take into consideration the
following points.
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(combined foul chambers & integral gullies) where drainage
with gravity is feasible within the bounds of the property or at a point of
exit from the property, it is most important to establish that the '
internal
drainage'is in good working order and to question as to whether the local
drains are connected to public drains or a soakaway. Drains can and do
block up or back up causing flooding, including escape of foul waste and
pungent smells. Soakaways can also fill up during periods of heavy rain,
which would lead to flooding and failure of the cavity membrane system.
In situations where the Sika C.D. System installer finds that the only
possibility of draining the cavity membrane is into a foul / soakaway
system or his client so instructs, liability for the waterproofing system
should therefore be excluded in the event of blockage of the foul pipes or
the soakaways filling up. Sika Limited’s advice is to always recommend
the inclusion of sump & pumps.
$ +.
+
(sump & pump) Sika Limited produce an off-the-shelf
sump & pump drainage system, ‘Sika C.D. Pump’ which has been
specifically designed for the purpose of controlling ground water ingress.
The simple to fit sump pump kit comprises of a polyethylene pre-formed
sump chamber with a structural lid. The submersible pump is controlled
by an automatic integral float switch and comes with a non-return valve
and a high level water alarm that warns of mechanical or power failure.
However, it may be prudent to install a double mechanical pump system
which consists of two pumps in the sump chamber. This secondary pump
would provide a back up pump in case of mechanical failure of the
principal pump. Consideration should also be given to installing a battery
operated Sika C.D. Back-up Pump in case of a power failure.
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
.
The Sika C.D. Channel is a P.V.C drainage
conduit specifically designed for the control of water ingress in below
ground situations. It is fitted around the perimeter of the floor at the
vulnerable wall / floor junction and can be used in most waterproofing
situations, and is particularly suited for use in conjunction with Sika C.D.
Membrane Systems. Water entering the building through the walls is
controlled behind the Sika C.D. Membrane and diverted to the Sika
channel at the base of the wall. The water enters the channel through
pre-drilled drainage holes and must then be diverted to a suitable
drainage point, either natural or a sump and mechanical pump. Jetting
eyes (cleaning ports) can also be incorporated into the channel.
(Floors) it is essential that there are no undulating surfaces or
'
depressions in the floor. In new build or whenever floors are being
replaced, the floor slabs can be designed and constructed to falls 2ºor 3º
towards the water collection facility i.e. sump chamber. Where an
existing solid floor is to be retained a sand/cement screed can be laid
over the entire floor gently sloping towards the sump. Further details of
mix ratios available through Sika Limited Technical Department. In all
cases the floor should always be tested by spraying with a hose, to
ensure that all water finds its way to the water collection point before
laying the cavity membrane.
NB wherever possible we recommend that Sika HD 20 be used on
floors. This is because the Sika HD 20 membrane has a far greater
drainage capacity and significantly reduces the risk of hydrostatic
pressure building up within the cavity.
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
+
, .
*
consideration must be given to the implications of
fitting sumps in the ground, e.g. where unstable elements are present,
such as chalk or sand. The installation of a perforated sump chamber
could cause washing away and potential undermining. Therefore, in such
cases, only sealed sumps should be installed and structurally held in
place by concrete etc, with the water collection limited to that entering
from the drainage channels. The final decision on the sump type in cases
where ground conditions are unknown should be delayed until
excavation is undertaken. Important note; if there is any concern as
to whether there is a risk of de-watering the ground to a condition
whereby the structure as a whole could or maybe undermined, then
advice should be sought from an Independent Engineer.
.
If the Sika C.D. Channel cannot be formed /
inserted into the floor at the wall/floor junction, because there are in-situ
reinforcing bars in the slab. Then either a fall must be created in the floor
(as previously described under the heading falls) or a series of small
surface channels (cut into the floor like chevrons) must be formed with a
fall towards the direction of the sump/water collection chamber.
%2
)
Plaster that may be affected by being closed in

behind the Sika C.D. Membrane such as gypsum or lightweight plaster
or where the existing plaster is loose or de-bonding should be removed
from walls / soffits prior to membrane application. Only where dense and
well adhered sand and cement renders are present and where removal
may cause unwanted structural damage to substrates can they be left in
place.
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
*
) ,
One of the benefits of using cavity drain membrane is that in general,
very little preparation to the substrates is required and although the
cavity membrane is flexible and does not need a perfect surface for
application, the following points need to be considered.
• Unsound materials on the surface like renders or plasters need to be
removed. (See also heading existing plasters). Any organic materials
such as wallpaper, timber skirtings, fixing grounds etc need to be
removed.
• A specialist timber treatment contractor should investigate any fungal
decay / infestations in timbers. Also timber that is in contact with damp
masonry should be remove or physically isolated.
• Excessively uneven wall and floor surfaces should be dubbed out /
levelled especially if timber battens are to be fixed to support dry
lining board. Where a wooden floor finish is required such as T&G
flooring grade chipboard, any depressions or undulations must be
levelled out to avoid undue variations in the floor finishes.
• Substrates must be free of sharp protruding objects and debris etc
that can damage the membrane. We would also recommend that
where mould, mosses, lichens and algae, has affected substrates, a
surface fungicidal wash should be used.
• Loose, friable or defective masonry should be repaired to ensure a
solid fixing.
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
$
*
(Internal applications in below ground structures)
&
+
set out below is a generic method
of installation, which can be used to apply; Sika C.D. Plaster, Standard
and HD 20 cavity drain membranes continuously between wall and floor.
NB it is assumed by this stage, that the site and design considerations
mentioned earlier in this document, have been assessed and the type of
drainage facility chosen has been tested.
-
'

)
9
,, +
$
*
- Sika C.D. Plaster & Standard membranes can be fixed
to walls either vertically or horizontally, but when choosing the method of
application, consideration should be given to the height of walls in
relation to the size of the roll of membrane. There are fewer joints in
horizontal applications but it can be awkward and difficult to manoeuvre
the weight of a full roll of membrane. Particularly in situations for
example; where the membrane has to be taken in and out of numerous
recesses, also around convoluting junctions or were walls are not
square. Vertical application may have more joints, but this method is
more manageable and much easier to fix.
Sika C.D. Plaster / Standard membranes are fixed to walls with the
Sika Masonry plugs. The masonry plugs should be prepared for use
before fixing by wrapping Sika C.D. Rope around the neck of plug just
under the head. This will form a seal with the membrane when the plug
is driven home into the substrate. (See fig 1&2)
If the ceiling height is constant, measure and cut drops of the membrane
to completely cover the wall areas to be treated. Place the membrane
against the wall as level as possible by eye sight and in the top right or
left hand corner (depending on which way around the room the
membrane is being taken) drill a hole through the centre of the
membrane stud using a 10mm drill bit. Insert the brick plug and hammer
home the plug till it finishes flush with the membrane (see fig 3).
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
Using a spirit level, level out the membrane and then drill and fix another
brick plug in the same manner approximately 1.5m along the top of the
sheet and along the same line of stud as the first fixing. Offer up the next
length of membrane and position the flange over the studs of the first
sheet and fix with 2 Brick plugs at high level as previously described.
Continue on in this manner, ensuring the membrane stays as level as
possible until all the walls are covered. These independent membrane
drops will relax after a while and hang flatter to the wall. The drops are
now ready for the next step.
Thoroughly clean the flange and the studs where the seal is to be made,
(the best cleaning material is a standard kitchen roll). Any dust or dirt will
compromise the integrity of the sealed joint. If the membrane is covered
in plaster or brick dust, wash off with clean fresh water only and allow to
dry. Do not use soap or detergents, as these will leave traces on the
membrane, which may affect the seal at a later date or make sealing
more difficult.
The separate membrane drops should now be sealed together using
Sika C.D. Sealing Tape. Apply the tape to the stud area below which
the flange will cover and press home onto the area between the studs.
Flick over the flange section to cover the tape line, and check for
uniformity of cover on tape line. Remove the tape backing paper,
starting from the middle section of the wall drop, forming two backing
paper tags, one going up and the other down. On the exposed section of
tape apply hand pressure only to the flange to form an initial seal. Carry
on to form the seal from the centre section of membrane working up to
the top, then go back to the centre and repeat the operation going
downwards. Sealing in this manner will prevent any buckling between
the membrane or stress concentration at the joint. In very cold or humid
conditions a hot air gun can be used to obtain a good sealed joint (see fig
4,5,6,7 & 8).
Now that the membrane is sealed to form one continuous sheet, Sika
C.D. Masonry Plugs can now be fixed through the membrane in position
to accommodate the chosen dry lining system. Note although a 10mm
drill bit is the correct size to use, in very soft brickwork this can result in
loose fixing. In these circumstances, it is useful to have on hand drill
sizes down to 8mm and experiment with different sizes for the best
results.
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
Floor application using Sika HD 20 - Once the membrane has been
fitted to the walls and before the dry lining system is installed, the floor
membrane needs to be laid. As mentioned earlier in this document Sika
HD 20 membrane is recommended on floors unless there is a head
height restriction, in which case Sika C.D. Standard Drainage
membrane can be used, but the installation of Sika C.D. Standard
Drainage Membranes differs slightly from that of HD 20 and will be
explained later.
Begin at one side of the room and unroll the Sika HD 20 floor
membrane against the wall membrane with the studs facing down onto
the floor and cut the membrane to the desired length or width of the floor.
Repeat this exercise till all the lengths/widths required to cover the floor
area have been cut allowing for a two-stud membrane overlap. (See fig 9
& 10)
The individual sheets of membrane that have now been cut, are joined
together with Sika C.D. Rope. The rope is positioned between the two
stud formations along the edge of the membrane to be overlapped and
remove the release paper. Lift the next sheet of Sika HD 20 membrane
over the two interlocking studs and press the overlapping membrane
down onto the sealing rope (see fig 11, 12, 13 & 14).
Foot pressure can be applied by sliding the sole of the foot over the
membrane joint, to ensure that the membranes are fully bonded. The
next stage of the operation is to link the Sika HD 20 floor membrane to
the wall membrane, which can be achieved, using Sika C.D. Corner
Seal. Using Sika C.D. Corner Seal, work out how many linear metres
there are around the walls, the Sika C.D. Corner Seal is produced in
manageable 2 metre lengths with a crease formed in the centre. Fold the
material in half down the centre crease and then apply Sika C.D.
Sealing Tape along the edges of the wall/floor junction material and
leave the backing paper on (see fig 15).
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
Ensure that the floor and wall membrane is clean and free from debris,
dust and moisture and then position the Sika C.D. Corner seal with the
crease into the angle. Working from the centre, carefully peel back the
backing paper in each direction and use hand pressure along the taped
edges to form a seal. To form internal and external angles using Sika
C.D. Corner seal, the wall/floor Junction is cut to the centre line and bent
either inwards or outwards depending on the angle. The edges are then
sealed with tape to the membrane in the same manner described above
(see fig 16, 17, 18, 19, 20, 21, 22, 23, 24 & 25).
If the Sika C.D. Corner Strip is chosen to link the floor and wall
membrane, the Sika C.D. Corner Strip is folded in half along the length
of the piece to be used and positioned with the crease into the angle as
described for the wall/floor junction. Once correctly aligned, carefully pull
off the backing paper and press firmly out with the palm of the hand onto
the floor and wall membranes. Internal and external angles can be
formed in the same manor as the Sika C.D. Corner Seal but because it
is a one-sided self-adhesive material and will stick to itself, no additional
sealing tape is required (see fig 26, 27, 28, 29, 30, 31 & 32).

'
,, +
$
*
– As with the HD 20, begin at one side of the room and
unroll the floor membrane against the wall membrane with the studs
facing down onto the floor. Allow for the membrane flange overlap, cut
the membrane to the desired length or width of the floor. Repeat this
exercise till all the lengths/widths required to cover the floor area have
been cut.
Roll out the next length / sheet of membrane and position the flange over
the studs of the first sheet laid and thoroughly clean the flange and the
studs where the seal is to be made as previously described for wall
application. Apply Sika C.D. Tape to the stud area below which the
flange will cover and press home onto the area between the studs.
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
Position the flange and check for uniformity of cover on tape line.
Remove the tape backing paper, starting from the middle section of the
membrane sheet, and peel off backing paper in opposite directions along
the flange. On the exposed section of tape apply hand pressure only to
the flange to form an initial seal. Carry on forming the seal working away
from the centre of the membrane. Foot pressure can be applied by
sliding the sole of the foot over the membrane joint, to ensure that the
membranes are fully bonded. Sealing in this manner will prevent any
buckling between the membrane or stress concentration at the joint. In
very cold or humid conditions a hot air gun can be used to obtain a good
sealed joint.
The next stage of the operation is to link the floor membrane to the wall
membrane, which can be achieved, using Sika C.D. Corner Seal. Using
Sika C.D. Corner Seal work out how many linear metres there are
around the walls, the Sika C.D. Corner Seal is produced in manageable
2LM lengths with a crease formed in the centre. Fold the material in half
down the centre crease and then apply Sika C.D. Corner Seal tape
along the edges of the wall/floor junction material and leave the backing
paper on.
Ensure that the floor and wall membrane is clean and free from debris,
dust and moisture and then position the Sika C.D. Corner Seal with the
crease into the angle. Working from the centre, carefully peel back the
backing paper in each direction and use hand pressure along the taped
edges to form a seal. To form internal and external angles using Sika
C.D. Corner Seal, the wall/floor Junction is cut to the centre line and bent
either inwards or outwards depending on the angle. The edges are then
sealed with tape to the membrane in the same manner described above.
If the one-sided adhesive corner strip is chosen to link the floor and wall
membrane, the corner strip is folded in half along the length of the piece
to be used and positioned with the crease into the angle as described for
the wall/floor junction. Once correctly aligned, carefully pull off the
backing paper and press firmly out with the palm of the hand onto the
floor and wall membranes. Internal and external angles can be formed in
the same manner as the Sika C.D. Corner Seal but because it is a onesided self-adhesive material and will stick to itself, no additional sealing
tape is required. (See fig 16 to 32)
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

'
,, +
$
*
: .
*
,
Beginning at one side of the
room, unroll the floor membrane against the wall membrane with the
studs facing down onto the floor, allow for a 150mm perimeter upstand
and cut the membrane to the desired lengths or widths. Around the
perimeter edges of the membrane, fold the membrane inward 150mm to
form a positive creased upstand and pull the floor membrane into
position with the formed crease sitting into the junction between the wall
and floor. NB where ever the floor membrane meets the wall, an upturn
must be allowed and formed as above (see fig 33).
Roll out the next length / sheet of membrane and position the flange over
the studs of the first sheet laid and thoroughly clean the flange and the
studs where the seal is to be made as previously described for wall
application. Apply Sika C.D. Rope to the stud area below which the
flange will cover and press home onto the area between the studs.
Position the flange and check for uniformity of cover on tape line.
Remove the tape backing paper, starting from the middle section of the
membrane sheet, and peel off backing paper in opposite directions along
the flange.
On the exposed section of Sika C.D. Tape apply hand pressure only to
the flange to form an initial seal. Carry on forming the seal working away
from the centre of the membrane. Foot pressure can be applied by
sliding the sole of the foot over the membrane joint, to ensure that the
membranes are fully bonded. Sealing in this manner will prevent any
buckling between the membrane or stress concentration at the joint. In
very cold or humid conditions a hot air gun can be used to obtain a good
sealed joint.
The next stage is to seal the floor membrane upstand to the wall
membrane. An upstand formed in this manner will be a stud to stud joint.
On walls all stud to stud joints are sealed with Sika C.D. Rope. The
rope is positioned between the stud formation on the blind side of the
upstand against the membrane on the wall. After positioning, the release
paper is removed from the rope and sealed fully with hand pressure only.
If large floor areas are started in this manner the tendency to form a
curvature in the membrane can be avoided.
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
Forming internal corners can be achieved by folding the upstands of
adjacent walls down on top of one another. This action creates a crease
in the corner and by pinching the two halves of membrane together at the
crease and then lifting upward against the wall, an internal corner will be
formed resembling a blanket fold (see fig 34, 35 & 36).
To extend the membrane upstand around an external corner, the
membrane upstand is cut at an angle of 45º from the bottom point of the
corner. When the floor membrane is then pushed around the corner, the
upstand is maintained and a '
V'shaped gap is created at the corner. The
floor membrane at corner '
V'joint is then sealed to the wall membrane

with Sika C.D. Rope as previously described and if necessary, the
corner can also be reinforced with corner strip (see fig 37, 38, 39, 40, 41
& 42).

'
77 !,, +
$
*
– Sika C.D. Standard Drainage Membrane should not be
fixed to the under side of a flat soffit unless a fall exists or a fall can be
created in the soffit itself. The soffit should first be measured to establish
the desired lengths or widths of membrane required to cover the area
and then a further 200mm each end of the membrane should be added
to the measurements, to allow for the membrane to be lapped down all
the peripheral walls.
Apply Sika C.D. Rope to the Sika C.D. Masonry Plugs as previously
described. Then around the perimeter edges of the membrane, fold the
membrane inward 200mm to form a positive crease and create a down
lap. Offer the membrane up to the soffit and position the down lap
creases into the junction between the soffit and wall.
Drill and fix enough Sika C.D. Masonry Plugs through the membrane
and into the soffit to hold the membrane in place with the studs against
the soffit. NB where ever the soffit membrane meets the wall, a 200mm
down lap must be allowed and formed as above.
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
Offer the next length / sheet of membrane up to the soffit and position the
flange over the studs of the first sheet, fix and secure the membrane as
described above. Repeat this operation until all the membrane sheets
are held in place. Thoroughly clean the flange and the studs where the
seal is to be made as previously described for wall application. Apply
Sika C.D Rope to the stud area, which the flange will cover and press
home onto the area between the studs. The membrane should now be
sealed to form one continuous sheet, Sika Masonry Plugs can now be
fixed through the membrane, in positions to accommodate the chosen
dry lining system. NB it is important to ensure that the membrane is taut
against the soffit and doesn’t sag, otherwise water ponding will occur and
the membrane/seals could fail.
Internal and external corners are formed in exactly the same way as that
which has been previously described in ‘Floor application using Sika
Standard Drainage Membran’ except in this case, they will be formed in
reverse and be upside down.
+ %
Where there are services such as pipes, ducting or steel stanchion that
protrude through walls or floors, the membrane should be carefully cut
and trimmed around the obstacle and sealed using a combination of
Sika C.D Rope or Sikaflex Polyurethane Sealants and Sika C.D.
Corner Strip material. Cloaks can also be formed using the Sika C.D.
Corner Seal. (See fig 43 & drawing illustration)
:
Door and window frames and timber surrounds should always be
removed to enable Sika C.D. Membrane to be extended around or into
door and window reveals to maintain the continuity of the waterproofing
system and to also provide a physical barrier between the frames and
damp masonry. In situations where the Sika C.D. Membrane would
restrict or limit the profile of replaced frames, then Sika C.D. Corner
Seal can be used to line and protect the reveals instead.
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
"
There is no requirement to ventilate the membrane cavity in a fully
sealed system such as in under pavement vault application. In a semi
sealed system, the cavity between membrane and substrate can be
vented into the room space with passive vents or if this is not possible, it
can be vented through the external wall using a 150 x 225 air brick
inserted every 1.5m to 2.0m along the wall. It is important that the cavity
between the membrane and internal finish i.e. dry lining, is not vented so
as to avoid possible interstitial condensation. However, consideration
should be given to the risk of condensation forming within the room itself
and the introduction of suitable heating and ventilation should be
recommended.
'
.
If timber battens are to be used, the traditional method is to fix a vertical
batten 25mm x 50mm. The Masonry plugs in this instance should be
fixed at 400mm centres horizontally and 600mm centres vertically. The
timber batten is screw fixed into to the self-tapping hole, which has been
formed in the Sika Masonry plug using a size (10) x 2" screw. NB we
would, however, recommend that foil back plasterboard or suitable
vapour check be used to prevent interstitial condensation forming in the
cavity.
For a metal fast track dry lining system such as Gypliner or Lafarge, the
Sika C.D. Masonry Plugs should be fixed at 600mm centres horizontally
and 800mm centres vertically. If an independent timber or metal frame
system is to be used, the wall membrane can be '
curtain hung'
. The
membrane is simply dressed down the walls just like hanging a curtain or
sheet. This method of installation requires less fixings. NB we would
however, recommend that foil back plasterboard or suitable vapour
check be used to prevent interstitial condensation forming in the cavity.
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
If an independent brick/block wall needs to be built in front of the Sika
C.D. wall membrane and requires lateral restraints, then screw in wall
ties can be used. The wall tie is screwed into the self-tapping hole of the
Sika C.D. Masonry Plug and is anchored into the mortar bed joint as the
wall is built. Independent free standing walls can also be built directly off
Sika C.D. membranes. Further advice is available from our Technical
Department before proceeding.
'
'
.
There is a wide choice of floor coverings that can be laid on top of the
Sika HD20 membrane. Listed below are some of the common
applications.
Sika C.D. Standard Drainage Membrane (Wood Based Flooring) –
Flooring grade T&G chipboard, Parquet, laminate, and wood strip,
Sika C.D. Standard Drainage Membrane (Sand & Cement Screeds)
Domestic - min 50mm screed or 20mm reinforced polymer modified selflevelling screed. Industrial – min 75mm reinforced screed or 35mm
reinforced polymer modified self-levelling screed.
Sika HD 20 (Wood Based Flooring) - Flooring grade T&G chipboard.
Parquet, laminate, or wood strip can also be applied, but a T&G
chipboard base should be laid first.
Sika HD 20 (Sand & Cement Screeds) Domestic - min 75mm reinforced
screed. Industrial – min 100mm reinforced concrete.
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
For Sika HD Membranes applied to walls at or above ground level, the
maximum insulation thickness should be 50mm. When Sika HD
Membrane is applied to earth retaining walls full height of a basement,
there is no upper limit to insulation thickness. However, if Sika HD
Membrane is applied to part earth retaining walls, then the maximum
insulation thickness should be 50mm. There is no upper limit to insulation
thickness for Sika HD Membrane applied to solid floors at ground or
below ground level,.
77 6 "
When working in a conventional vault with rounded ceilings the water can
run off freely and the following method should be adopted: When lining vaults always work from the front to the back, starting on the
centre line of the vault. Measure the length of the vault and add 400mm
to this measurement, then cut the membrane to the length. Form a 900
downturn crease 200mm in from either end of the membrane and
prepare the Sika C.D. Masonry plugs by wrapping with Sika C.D. Rope
as previously described.
Offer the membrane up to the vault ceiling along the centre line of the
vault, and drill and hammer home the Sika C.D. Masonry Plugs in a
straight line at 600mm centres from front to rear. These will provide fixing
points for the dry lining system. The creased downturn at either end of
the vault will start to deform going into the curvature of the vault ceiling.
Where this occurs, carefully slit/cut the deformed sections, towards the
crease but stop short of the crease by one stud.
The membrane can now be overlaid and will flatten out and follow the
curvature. Several slits may be required to achieve this depending on
the radius of the vault. Continue to work out from the first sheet, ensuring
a weathered joint of not less than eight studs. The flange should be used
to make both of these weathered joints either side of the initial
membrane fixed off the central line of the vault. The weathered joints are
sealed flange over stud using Sika C.D. Rope in the manner previously
described earlier.
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
The end walls are now ready to be lined with the membrane. The end
wall sections are cut to the true width of the vault so that the membrane
overlaps the membrane returns already formed. These sections of
membrane are fixed and sealed in exactly the same way as described for
wall application. The end wall membrane stud to stud joint should be
sealed around the radius with Sika CD Rope and if necessary corner
strip. The floor membrane is now ready to be laid over the completed
drainage system. The Sika C.D. Corner Seal, Sika C.D. Corner Strip
or creased upstand is always in front of the wall membrane and sealed
on the perimeter with Sika CD Rope as the case may be.

)
(Internal applications in below ground structures)
Sika CD Plaster Drainage can be applied onto existing solid wall
finishes. All surfaces must be of a sound, firm nature and any loose
areas should be removed prior to application. Any voids or hollow areas
should be filled or dubbed out prior to application. Where necessary a
fungicide wash should be applied to the wall surface. Sika CD Plaster
Drainage is for internal use only on walls and curved soffits and is
compatible with other Sika C.D. Membranes. Sika C.D. Plaster
Drainage is not recommended for external application and should not be
used on floors.
Sika C.D. Plaster Drainage membrane is fixed to walls with the Sika
C.D. Plaster Plugs. The Sika C.D. Plaster Plugs should be prepared for
use before fixing by wrapping Sika C.D. Rope around the neck of plug
just under the head. This will form a seal with the membrane when the
plug is driven home into the substrate.
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
If the ceiling height is constant, measure and cut drops of the membrane
to completely cover the wall areas to be treated. Place the membrane
against the wall as level as possible by eyesight. In the top right or left
hand corner (depending on which way around the room the membrane is
being taken) drill a hole, 3 studs in from the edge through the centre
spacing between 4 studs, not through the stud itself. Using an 8mm drill
bit and insert the plaster plug and hammer home the plug till it finishes
flush with the membrane (see fig 46).
Using a spirit level, level out the membrane and pull taut, then drill and fix
another plaster plug in the same manner at the other top edge of the
sheet. Offer up the next length of membrane and position the membrane
so that this sheet overlaps by a minimum of (2) studs over the first sheet
and fix with 2 plaster plugs at high level as previously described.
Continue on in this manner, ensuring the membrane stays as level as
possible until all the walls are covered. These independent membrane
drops will relax after a while and hang flatter to the wall. The drops are
now ready for the next step.
Down the overlap joint, fix Sika CD Plaster Plugs through the studs as
close as possible to the edge of the overlapping membrane. Fixings
should be made at 150mm centres along this joint. Continue fixing the
plaster plugs in a diamond pattern through the centre spacing between
the 4 studs until sufficient fixings have been installed, ‘minimum 13/m²’.
The membrane must fit tight against the structure with no voids or hollow
areas left between the wall and the membrane, as this could cause
bonding problems between the membrane and the plaster/render. Care
should also be taken at corners to ensure the membrane is fitted tightly
into the corner so to avoid snagging or tearing with a trowel (see fig 47,
48 & 49).
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
Once all fixings are in place, clean the membrane surface thoroughly
along the overlap joint and ensure it is dry and free from dust. Apply
Sika C.D Plaster Tape along the joint with equal overlaps onto each
sheet of membrane and press firmly into place. Sika C.D. HD20 floor
membrane can now be laid over the completed drainage system. Sika
C.D. Corner Seal, Sika C.D. Corner Strip or a creased upstand is
always placed in front of the Sika C.D. Plaster Drainage membrane and
sealed on the perimeter with Sika C.D. Rope as the case may be. If the
plaster finish is required to extend down to the finished floor and
therefore over the wall/floor junction or corner strip or upstand, Sika
C.D. Plaster Tape will need to be applied to provide a key for plastering
(see fig 50 & 51).
'
.
Most common lightweight and renovating plasters (Tilcon Whitewall) or
sand / cement renders can be applied to Sika C.D. Plaster Drainage.
(The use of British Gypsum Hardwall or Tuff Coat is not recommended).
When using sand / cement render, mixes of 1 part cement to 6 parts
washed plastering sand, incorporating either SikaBond SBR or hydrated
lime should be used. NB Grade ‘M’; medium sharp sand should be used.
Do not use soft or building sand. Alternatively Sika can offer Sika-1 Prebagged finishing mortar as a pre-bagged quality assured render.
All render / plasters should be applied in a minimum of two coats,
allowing the 1st coat of 7mm – 10mm to be trowelled firmly into the
membrane studs and then scratched to provide a key for subsequent
coats to be applied. The first scratch coat should be left to cure and
harden. Ideally this should be 7 – 10 days depending on site &
atmospheric conditions. The minimum plaster thickness should be 15mm
and the maximum thickness (sand/cement 30mm) (lightweight plasters
40mm). Plasterboard can also be dot & dabbed onto the plasterbase as
a fast track system, using board adhesive.
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
'2
.
.)
*
!7
)
On occasions where a fixing is required through the membrane, any one
of the three fixing methods set out below can be used to achieve this.
By using a Sika C.D. Masonry Plug with Sika C.D. Rope, First mark
out on the plaster surface where the fixing is required and then place the
head of the brick plug over the mark and draw a pencil line around the
circumference of the head. Drill a 10mm hole through the centre and
carefully scrape/scratch out the plaster within the pencil line back to
expose the membrane. Blow out the debris, insert the masonry plug and
hammer the plug home so that the head of the plug sits flush with the
membrane surface. (See Fig 62)
By using a raw plug, simply drill a hole through the plaster and
membrane and clean debris from the hole. Fill the hole with Sika
AnchorFix, allowing the resin to ooze out slightly onto the plaster surface
and insert the raw plug and allow to harden. (See fig 63)
By using contact adhesive and timber batten. As before, mark out where
fixing is required and remove any setting coat plaster. Apply SikaDur 31
epoxy resin adhesive or Sikaflex-11FC+ polyurethane elastic bonding
sealant to the surface area and to the timber batten and press the batten
into position. Some temporary support may be required until the timber
has fully bonded. (See fig 64)
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
!
) $)
(Single Sump & Pump kit with Alarm)
The site conditions or situation being encountered may well determine
the positioning of the Sika C.D. Pump Kit. Ideally it should be sighted at
the lowest point of the room and or closest to the nearest point where
water will be discharged. The most important thing is to make sure
that water can get to the pumping station. Once the pump position
has been established, dig a circular hole to a depth of 610mm (2ft) and to
a width of 630mm (2ft 1”). (See also ‘undermining structures’)
Fit the high water level alarm float switch sensor into the pre-cut hole
provided within the wall of the sump basin and ensure that the (jaw) of
the switch sensor is open and hangs downwards. NB: if the water
discharge pipe from the pump is to be concealed below the floor, than a
1½” hole will need to be cut through the side of the basin. However, the
position of this hole can only be determined once the sump basin has
been offered into position, otherwise the discharge pipe can be taken
through the lid of the basin.
Lay a 50mm bed of 20mm stone in the base of the hole and insert the
sump basin. Using a spirit level, adjust the top of the basin to the level of
the finished floor level and then fill the sides of the sump basin with more
20mm stone. NB: If Sika HD 20 membrane is being installed over the
floor, then the 20mm stone will need to be levelled flush with the
concrete base. However, when Sika C.D. membrane is not going to be
installed over the floor, the 20mm stone should be kept 50mm lower that
the finished floor in order that the edge around the sump basin can be
made good with screed.
Insert the Sika Pump in the base of the sump basin and connect the
water discharge pipe to the flexible coupling already attached to the
pump. The discharge end of the pipe can be taken through a wall and
extended to a gully outlet at ground/street level. Alternatively, the
discharge pipe can be connected straight into a soil pipe using a ‘boss’
connection. Where a double pump installation is being used, one of the
Sika Pumps should be raised off the base of the sump basin
approximately 25-30mm. A flat stone can be used to achieve this.
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
Connect the wires from the float switch sensor to the wires of the water
alarm using the bullet connectors provided. Then connect the pump/s
power cable into a fused spur outlet and test the pump and alarm for
working order (see photos fig 52, 53, 54 & 55 illustrating in-situ sump
pump).
NB: If there is any concern as to whether there is a risk of de-watering
the ground to a condition whereby the structure as a whole could or may
be undermined, then advice should be sought from a qualified engineer.

& +
,)
,
Position the Battery Back-up Pump kit in the desired location.
Run the flexible suction hose from the pump to the sump and secure
approximately 100mm from the base of the sump.
Connect the outer end of the suction hose to the pump inlet with the
jubilee clip provided.
Connect the float switch (which is attached to the main pump) wire to the
connector block inside the back-up pump chamber.
Solvent weld the discharge pipe to the pump outlet and connect to
suitable drainage point: - Drainage Gully, Boss Connector or TConnector.
Connect battery terminals and plug-in battery charger to power supply.
The battery will begin to charge.
The battery charge state is indicated by the L.E.D display on the charger.
Once the battery is charged, fill the sump chamber to test the system.
(See fig 56 photo illustrating pump operation test)
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
!
(!
%8
!88!
1.
Form a trough 130mm deep x 130mm wide
in the floor at the wall / floor junction (see
also fig 57).
130
130
2.
3.
4.
Apply the waterproof coating or Sika C.D.
System Membranes to the wall and finish
100mm minimum below existing floor level
(see also fig 58).
Lay a shallow bed of 20mm stone
into

the trough. Place the Sika C.D. Channel
onto the stone with the upstand to the top
and flat against the waterproofing / cavity
drain membrane to the wall. Lengths of
C.D. Channel are butt jointed on
straight runs and can be mitred in
corners. Joints should be sealed with Sika
C.D. Tape to avoid debris from falling
into the channel (see also fig 59).
100
20mm Ø STONE
Fit the C. D Channel outlet into the C.D.
Channel at the appropriate location. The
C.D. Channel outlet requires a 40mm hole in
the underside of the C.D. Channel. The C.D.
Channel outlet is solvent welded to the
channel using the internal male coupling. A
chase should be formed into the floor to
accommodate the outlet pipe from the C.D.
Channel to the sump or drain.
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
5.

Infill the remaining gap between the Sika C.D.
Channel and the side of the trough with 20mm
stone and finish flush with the flat surface of the
C.D. Channel (see also fig 60 & 61).
INFILL WITH 20mm Ø STONE

6.
When installing Sika C.D. HD 20 Membrane
over the floor, make good the remaining area
with 20mm stone. Lay the membrane over the
floor area and seal to the wall membrane using


Sika C.D. Corner Seal or Sika C.D. Rope.
7.
When Sika C.D. Membrane is not going to be
installed over the floor, make good the
remaining area with approximately 50mm
screed.

50mm SCREED REPAIR
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FIG. 1
FIG. 2
Preparing Sika C.D. Masonry Plug with Sika C.D. Sealing Rope
FIG. 3
Inserting Sika C.D. Masonry Plug through membrane stud
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
FIG. 4
FIG. 5
FIG. 6
FIG. 7
Flange to stud using Sika C.D. Tape
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
FIG. 8
Completed flange to stud overlap seal
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
FIG. 9
FIG. 10
Sika HD 20 floor membrane cut around perimeter walls
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
FIG. 11
Positioning of sealing rope between two studs of the Sika HD 20
Membrane
FIG. 12
Removing Sika C.D. Sealing Rope release paper
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
FIG. 13
Positioning membrane stud to stud over Sika C.D. Rope
FIG. 14
Press membranes together to ensure bond
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
FIG. 15
Sika C.D. Tape being applied along edges of wall / floor junction
FIG. 16
Sika C.D. Corner Seal junction cut to create internal & external fold
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
FIG. 17
Internal Fold
FIG. 18
Removing release paper & pressing taped corner joint into position
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
FIG. 19
FIG. 20
Sealed and completed corner joint
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
FIG. 21
FIG. 22
Sika C.D. Corner Seal offered into position & release paper
removed
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
FIG. 23
Angle piece fitted to complete external corner joint
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
FIG. 24
FIG. 25
External corner piece placed in position & sealed with
Sika C.D. Sealing Tape
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
FIG. 26
Forming 90° angle crease in Sika C.D. Corner Strip
FIG. 27
Sika C.D. Corner Strip with crease offered into angle
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
FIG. 28
Sika C.D. Corner Strip – angle cut
FIG. 29
Sika C.D. Corner Strip pressed into position
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
FIG. 30
FIG. 31
Angle piece to seal and complete corner joint
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
FIG. 32
Completed wall / floor junction detail
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
FIG. 33
Preparing & positioning floor membrane upstand
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
FIG. 34
FIG. 35
Floor membrane (internal corner upstand folds)
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
FIG. 36
Internal angle formed in Sika C.D. Standard Drainage Membrane
floor membrane upstand
FIG. 37
45° external angle cut in floor membrane upstand
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
FIG. 38
Sika C.D. Standard Drainage floor membrane external corner
upstand ready for sealing with Sika C.D. rope
FIG. 39
Sika C.D. Rope applied to floor membrane external corner ‘V’ joint
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
FIG. 40
External corner ‘V’ joint complete
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
FIG. 41
FIG. 42
Sika C.D. Standard Drainage Membrane flange to stud tape seal
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
FIG. 46
FIG. 47
Drilling & Fixing Sika C.D. Plaster Plugs between 4 studs of the
membrane
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
FIG. 48
FIG. 49
Sika C.D. Plaster Membrane Plug diamond fixing pattern
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
FIG. 50
FIG. 51
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
FIG. 52
FIG. 53
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
FIG. 54
FIG. 55
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
FIG. 56
FIG. 57
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
FIG. 58
FIG. 59
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
FIG. 60
FIG. 61
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
#)
!8 %; %
!8 6
%
! !" # - !88
!8 - !88 !))8
!
D.P.C. OR SIKA C.D.
CORNER SEAL
JUNCTION FORMED &
LAPPED OVER PRIMARY
MEMBRANE APPLIED TO
EXTERNAL WALLS.
DRY LINING
PRIMARY MEMBRANE
I.E. SIKA 49W THICK
BITUMINOUS EMULSION
APPLIED TO MASONRY
SIKA C.D. SYSTEM
MEMBRANE
SIKA C.D. STANDARD INTERNAL
WALLS & EXTENDED INTO SIKA C.D.
CHANNEL
SIKA C.D. HD 20 OVERLAYED
WITH 75mm REINFORCED SCREED
OR 80mm T & G FLOORING GRADE
CHIPBOARD
LAND DRAIN
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
'8!
''
%
%
!
%
)!"%$ %
CONCRETE SOFFIT
RENDERED WITH
SIKA-1 FINISHING
MORTAR TO CREATE
A FALL IN
DIRECTION OF ROAD
OR STREET
SIKA C.D. MEMBRANE FIXED
TO WALLS & OVERLAPPING
THE SOFFIT MEMBRANE WITH
A ROPE SEAL BETWEEN BOTH
MEMBRANES. NB: THE
OVERLAP JOINT CAN ALSO BE
REINFORCED IF REQUIRED
USING CORNER STRIP.
BATTEN & BOARD
DRYLINING NB: FOILBACK
PLASTERBOARD IS
RECOMMENDED
SIKA PRIMER MB
APPLIED TO SOUND
SLAB/FLOOR
% ! 8
SIKA C.D.
MEMBRANE FIXED
TO SOFFIT &
EXTENDING THE
MEMBRANE DOWN
ALL WALLS A
MINIMUM OF 200mm
SIKA C.D. CHANNEL
& 20mm STONE
EXTENDED TO
DRAINAGE FACILITY
I.E. SUMP PUMP
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
$ %$ & ! % 6
(!
%8 '8
( "% 8!
% ! 8
% %
GROUND LEVEL
SIKA C.D. PLASTER DRAINAGE MEMBRANE
STEEL
REINFORCEMENT
SKIRTING
SIKA H.D. 20 FLOOR
MEMBRANE
FLOOR SCREED
SIKA C.D.
CORNER SEAL
SIKA C.D.
CHANNEL &
20mm STONE
NEW SLAB
EXISTING SLAB OR
COMPOSITE SCREED /
CONCRETE MATERIAL
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
"%
!8 '8
)$ 8
$ %$ & ! % !
(% - !889'8
8%"%8 !))8
SIKA C.D. CAVITY
MEMBRANE TO
WALLS & DRESSED
DOWN INTO THE
FLOOR SLAB
BEHIND FLOOR
D.P.M UPTURN
FLOOR LAP DPM
SEALED TO SIKA
C.D. MEMBRANE
WITH SIKA C.D.
TAPE
!
'
%
<
!
INDEPENDENT METAL STUD DRY
LINING TO WALLS WITH VAPOUR
CHECK PLASTERBOARD
FLOOR SCREED
x
150mm
INSULATION
I.E. KINGSPAN
D.P.M
CONCRETE SLAB
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
% ! 8 ( -
'8
9- !88 $ %$ & ! %
GROUND
LINING
SIKA C.D. WALL
MEMBRANE
T & G CHIPBOARD
S
S

SIKA C.D.
CORNER SEAL
SIKA C.D. CHANNEL &
20mm STONE
SIKA C.D. MEMBRANE
SLAB
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
';
% ! 8=
%
SIKA C.D. MASONRY PLUG
SIKA C.D. ROPE
SIKA C.D. MEMBRANE
WALL CONSTRUCTION
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