1.0
INTRODUCTION
This method statement is described the
methods of water proofing works for lift pit, Harvesting tank, Water sump and
fire tank.
The internal
area of Water sump, harvesting tank, fire sump will be waterproofed as per
described in this method statement.
The external
surface of lift pit, harvesting tank, water sump will be waterproofed as per
described in this method statement.
2.0
MATERIALS
Internal Water
proofing
Brushbond TGP
External Water proofing
Bituflame P 4180
Construction Joint
Waterstop-RX
3.0
PROCEDURE
3.1 Internal water proofing for Harvesting tank,
Water sump and Fire sump
Surface preparation
ü
Any cement mortar, dust on the surface will be removed
ü
If any honeycombing exists in the structural
concrete, such defective area will be hacked and patched with construction
ground.
ü
The surface will be washed with clean water to
be free from dust and dirt.
Application
ü
Prior to application of the waterproofing the
surface will be wetted.
ü
The contents of Brushbond TGP is mixed with clear water and ensured proper
dispersion of the components. 3 parts of powder shall be added to 1 part of
clean water and mixed thoroughly using a mixer
ü
The first coat will be applied on the concrete
surface.
ü
On the completion of the first coat, the final
coat will be applied cross link to the first coat as per the manufacture’s
specification.
Curing period
ü
Brushbond TGP applied area must be kept moist
for a minimum of 48 hours.
Curing period
ü
The structure will be pond tested for a minimum
of 24 hours.
Protection for the waterproofing
application
ü
On the completion of the pond test the internal
area of water sump, fire sump and harvesting tank will be protected with a
cement sand mortar.
4
3.2 External water proofing for Harvesting tank,
Water sump and lift pit
Surface preparation
ü
Any cement mortar, dust on the surface will be removed
ü
If any honeycombing exists in the structural
concrete, such defective area will be hacked and patched with construction
ground.
ü
The surface will be washed with clean water to
be free from dust and dirt.
ü Dewatering
will be undertaken to ensure that the area is dry to receive the sheet membrane
(if required)
ü A
cement sand fillet (50mmx 50mm) to be laid at the intersection of the lean
concrete and the vertical structure.
Application
ü
Bitumen primer ( Bitu primer) will be applied to
the surface and allowed to cure prior to areas to receive water proofing
membrane treatment.
ü
The sheet membrane will be the torch laid on the lean concrete and the
vertical concrete structure
ü
The sheet membrane will be terminated minimum
300mm from ground floor level.
ü
A water bar will be used in all construction
joints
ü
The membrane termination points should be
terminated with an aluminum strip that is nailed to the vertical structure and
sealed using a bituminous sealant
ü
The aluminium strip to be sealed with using a
mastic sealant.
ü
Allow to dry one day and
ü
Place the gauge 500 polythene sheet or 10mm
regiform sheet as protection.
ü
Then backfilling will be started.
ü
Pls see attached typical sketch for application
ü
Pls refer attached TDS sheet for more details.
5
6
4.0
Quality Assurance/ Inspection and testing
All kinds of inspection for construction
shall be carried out by the QA/QC Engineer of Sanken along with consultant
representative as per the standard and specification.
However, prior information shall be given
to consultant representative at site to proceed necessary checking periodically
and make final comment.
Following are used for the quality
assurance and control work.
01. Request
for inspection
02. Pond
test approval sheet
5.0
SAFETY PLAN
·
All the dangerous areas must be barricaded
·
At the time of application, adequate ventilation
will be provided
·
Gloves will be used when mixing material
·
Safe flat forms for working at higher levels
shall be provided.
·
Safety Guard
rails shall be provided at the perimeter run.
·
All the electrical wires and sockets such a way
that must be covered to safety regulation
·
First aid facilities and vehicles for emergency
cases shall be available at site
