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WP 5115A – Prefabricated bathrooms Phase I & II

Method Statement for Application of "PCI" Waterproofing

VENETIAN MACAU

HOTEL FIT OUT

ELECTRICAL INSTALLATIONS WAI FAT CO., LTD.

Version 3 22.03.2006

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1. Scope of Work

1.1 Specification Reference Architectural Specification Section 07140 rev.3, Clause 2.01 B-D

1.2 Third Party Interfaces

Concrete substrate in interior wet areas; Drywall Substrate Floor Drains Pipe works All other finishing works

2. Work Methodology

2.1 Time 8:30am ~ 6:00pm

2.2 Duration

According master program for this task duration Refer to Item 2.3 Sequence for application duration

2.3 Sequence

2.3.1 The substrate must be solid, dry, clean, smooth (steel-Trowelled finish, no pocket, gaping cracks and ridges) and free from oil, grease and other residues which should be removed by sand-blasting, brushing or shot-blasting if necessary.

2.3.2 Absorptive mineral substrates are to be primed with PCI Gisogrund, diluted 1:1 with water.

2.3.3 Wait the primer to dry (at least 3 hours). 2.3.4 Apply “PCI” LASTOGUM Liquid Applied Waterproofing Membrane

A. Manufacturer recommended applying at least two coats (thickness of wet film each wet film coat : 0.5mm).

B. The first coat should be applied with PCI Lastogum red. Evaporation time after first coat is minimum 3 hours at +23°C and 50% relative humidity. Higher temperatures reduce and lower temperatures increase these times. The air flow will affect the evaporation time as well.

C. Sealing the corner and wall/ floor and wall/ wall joints Press PCI Pecitape Objekt sealing tape onto the fresh first coat at corners, wall /floor and wall / wall joints. Cut the tape to fit at corners.

D. Sealing the pipe penetrations

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Using the fingers, stretch a PCI Pecitape 10 x 10 / PCI Pecitape 35 x 35 sealing gasket to give a tight fit over the pipe. Place it in position, bedding it onto the fresh first coat.

E. Sealing a floor drain Cut a PCI Pecitape 35 x 35 sealing gasket to suit the drain system to be used. Place it in position, bedding it onto the fresh first coat. Contact PCI for specific guidance if necessary. Insert loose flange of the floor outlet and screw down.

F. Before the application of the second coat, ensure the first coat is dry (at least 6 hours) and has not been damaged.

G. For wall application, apply the second coat of PCI Lastogum grey which is a one-component system. For floor application, apply the second coat of PCI Lastogum grey which is a two-component system (Need to mix the two components by slow speed drill fitted with a suitable paddle for at least 2 minutes before use).

H. Ensure the cured waterproofing membrane is dry and has not been damaged before fixing tiles. If water flooding test is necessary, wait for at least 3 days after the second coat has been completed, before carrying out the test.

I. Tiles can be fixed after the second coat has been completed for at least 24 hours at + 23°C and 50% relative humidity.

2.4 Location

Bathroom Interior Wet Areas 3. Resource Required 3.1 Personnel

Site Supervisors Trained Waterproofing Applicators

3.2 Plant

N/A

3.3 Materials PCI Gisogrund Primer PCI Lastogum Red PCI Pecitape PCI Lastogum Grey

3.4 Specialist Services

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Flood water test after completion for floor Water spray test for wall after completion

3.5 Supervision

Experience Site Supervisors Foremen Safety officer

4. Assessment of Significant Risks 4.1 Access / Egress

Blockage of the bathroom access during the waterproofing curing period.

4.2 Place of Work According to the Scope of Works for Package 5115A

4.3 Others at Risk

Refer to the risk assessment sheet

4.4 Competence for 'Key' Activities Water proofing test pass

4.5 "Dangerous Goods, Noise, Manual Handling, etc"

N/A

4.6 Environmental Impacts Disposal Waterproofing material mix with ground water

5. Control Measures to be used

5.1 Emergency Arrangements Please refer to Material Safety Data Sheet. Emergency Call : 1. Mr. Wong Peng Tong 6338673 / 339966

2. Mr. Andrew Ip 6557228 / 339966

5.2 Security Provide by CM & Major Trade contractor. Temporary fencing to block the access bathroom during applying the

waterproofing.

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5.3 Third Party Liaison MEP package Drywall package

5.4 Work Instructions and Field Controls

On completion of the waterproofing, CM to be informed prior to tests. No material / finishing shall be placed on the waterproofing prior to testing.

A. Visual Inspection : Visually inspect waterproofing system installation thoroughly in presence of architect's representative. Bubbles formed in the waterproofing system will be made good in accordance with the manufacturer's recommendation. Repair any defects as recommended by manufacturer.

B. Testing of Horizontal Installations:

Flood test to be carried out for checking the water tightness of the waterproofing system. The surfaces shall be cleaned, checked for cracks and the flood test carried out as follows:

After the waterproofing membrane is applied, allow minimum 72 hours for

the membrane to cure before conducting the water flooding test; Temporarily block off all the water outlets by means of impermeable

materials; Flood the waterproofed area with water to a depth of not less than 25mm; Allow the water flooding to stand for 24 hours; Make joint inspection with client's representative of the waterproofing

system to check any abnormal appearance (e.g. debonding, peeling off, etc.);

Make joint inspection with client's representative of the underside of the waterproofed area to check any water leakage;

Record the testing result on inspection forms, taking record photos where necessary;

Remove all the block out at water outlets and allow the water to drain away, or pumped the water out by vacuum pump.

Observation shall be made to the ceiling areas below and adjacent rooms three times daily. Any watermark or leakage shall be recorded on inspection form. A copy of duly signed inspection form to be submitted to the Architect upon completion of the flood test.

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Any leakage or defect observed to be made good and have the area to be retested until a satisfactory result is being obtained.

C. Testing of Vertical Installation

Carry out joint inspection with client's representative for water spray test to waterproofing system applied on wall (exceeding 300mm high only) with the following procedures.

After the waterproofing membrane is applied, allow minimum 72 hours

for the membrane to cure before conducting the water spray test; Apply water using a common domestic telephone type shower head fitted to

a 13mm diameter supply pipe delivering water pressure of not less than 0.2N/mm2 (30 psi). Locate the pressure gauge at a distance not exceeding 1500mm from the shower head;

Move shower head to and from or as directed by client's representative along the waterproofing wall surface to be tested (at the level at approx. 100mm below the highest level of the waterproofing membrane ), at a perpendicular distance between 300mm to 600mm for 2 minutes;

Carefully make inspection of the other side of the waterproofed wall surface to check any water seepage;

Record the testing result on inspection form, taking record photos where necessary;

Observation shall be made to the wall of adjacent rooms three times daily. Any watermark or leakage shall be recorded on inspection form. A copy of duly signed inspection form to be submitted to the Architect upon completion of the water spray test. Any leakage or defect observed to be made good and have the area to be retested until a satisfactory result is being obtained.

5.5 Permits About 1m height working platform

5.6 Personnel Protective Equipment

Helmet Reflective wear Safety shoe

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Glove

5.7 Specialist Training Subject by manufacturer.

6. Provision of Information

6.1 Changes to Information All the update information will be submitted to GBCML as soon as any update

information for the supplier/applicator.

6.2 Confirmation of Emergency Arrangements / Drills According to GBCML’s emergency arrangements / drills, such as fire drill.

6.3 Employee and Third Party Briefings

WRC training/Briefing Tool box talk Submit above record to GBCML

7. Verification Records

7.1 Initial Records Requirements Setting out of floor leveling. Substrate

7.2 Records to be taken during Construction

Inspection form with photos for completion of the water spray test / flood test.

7.3 Completion Certification Package Warranty issued by Manufacturer

7.4 Filing Arrangements

Full set of records will be submitted to GBCML 8. Appendixes

Demarcation for the height of wall waterproofing Hazard identification sheet Risk Assessment Sheet PCI Material Safety Data Sheet

Works Related Projects: Package 5115A - Prefabricated Bathrooms Phase I & II Date : 20/03/2006

Type of Activity Operation : Application of Waterproofing

Job Task Hazard People Affected Cause of Hazard Worst Harm due to

Hazard

Existing Control

Measures

Remark

Eye contact with the

waterproofing material

Installer Workers did not

wear and use safety

equipment

Eye irritation Wear safety goggles

when working above

eye level or if there

is danger of

splashing.

-

Inhalation with the

volatile element

Installer Workers stayed in

the closed area for

a long time

Dizziness Supply fresh air by

ventilator.

-

Skin contact with the

waterproofing material

Installer Workers did not

wear and use safety

equipment

Skin irritation Wear safety gloves.

After application,

installer should wipe

off substance and

clean with soap and

water.

-

Fall of Person Installer Worker use

unsafety platform

or ladder

Body injury Sufficient working

space should be

provided such as

work platform

-

Muscular stress/sprain Installer Uncorrect manual

handling operation

Body injury Warm up / use

correct tools

-

Application of

waterproofing

material

Hazard Identification Sheet

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Date : 20/03/2006

Risk Control Measeure Risk Level Recommended

Action

Remark

Probability Consequences

Eye contact with the

waterproofing

material

Wear safety goggles

when working above eye

level or if there is danger

of splashing.

2 3 (Green) Safety Goggles

required

-

Inhalation with the

volatile element

Supply fresh air by

ventilator .

2 3 (Green) Supply fresh air by

ventilator

-

Skin contact with the

waterproofing

material

Wear safety gloves. After

application, installer

should wipe off substance

and clean with soap and

water.

3 2 (Green) Safety Gloves

required

-

Fall of Person Sufficient working space

should be provided such

as work platform

2 2 (Green) Use safety

workplatform

-

Muscular

stress/sprain

Warm up / use correct

tools

2 2 (Green) Warm up / use

correct tools

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Note :

Risk Level: (Red), (Orange), (Yellow), (Green)

Risk Assessment Sheet

Probability or Likelihood Rati Almost Certain (5), Probable (4), Possible (3), Remote (2), Impossible (1)

Consequence Rating: Very High (5), High (4), Medium (3), Low (2), Very

Rating of Harm

Works Related Projects: Package 5115A - Prefabricated

Type of Activity Operation: Application of Waterproofing

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