method statement for waterproofing system of prefabricated bathroom

TOP BUILDERS INTERNATIONAL CO. LTD.

Method Statement For

Waterproofing System (WP2)

Project: Venetian Macau in Cotal, Macau Re: Work Package 5115 (Top Builders), Prefabricated Bathroom Revision: B Date: 2006/06/19

Method Statement for Waterproofing System (WP2)

Page 2 of 5

Table of Content

Content .. 2 Scope of work .. 3 Relevant submission .. 3 Application of waterproofing .. 3 - 5

Preparation work .. 3

Concerns .. 3 Installation .. 4

Field quality control .. 4 Protection ... 5 Cleaning ... 5 Appendix i iii Demarcation Plan i Hazard identification ii Risk assessment iii


Page 3 of 5

Scope of work Trade contractor of this project will be responsible for the execution of the work in accordance with the specifications and relevant approved documentations. The scope of work includes supply and installation of waterproofing system (WP2) including PCI gisogrund protective primer, PCI lastogum waterproof coating, and PCI pecitape fabric tape system at the L33 to L37 tower suite bathroom areas. Relevant submission

Material Submission of the wash and protective primer PCI gisogrund for walls and floors.

Material Submission of the waterproof, flexible protective coating PCI lastogum under marble panels in toilets, shower and bathrooms with official test certificates.

Material Submission of the special fabric tape system PCI pecitape for waterproof corner and perimeter joints, pipe culverts and floor drains.

Application of waterproofing system Preparation work

1. Site Cleaning 2. Site surveying and setting out 3. Erect working platform if necessary and according site safety

regulations.

Concerns

1. Working at Height Working platform will be provided if higher than 2m and erected by experience competent worker and inspected by the appointed professional person signing and certifying Form 4 & 5 before use and re-inspection on 7-14 days.

2. Substrate Preparation Substrate must be solid, dry, clean and free from oil. The surface must not have any pockets, gaping cracks or ridges.

3. Factor affecting Evaporation Time for Lastogum Higher temperatures reduce and lower temperatures increase these times. The airflow will affect the evaporation time as well.

4. Quality of drywall The surface of the board, the workmanship of the joints between boards and wall to floor joint alignment should be inspected before application.


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y Installation

1. Remove all debris on wall and floor surface. 2. Absortive mineral substrates are to be primed with PCI gisogrund

with 1:1 water. 3. Wait the primer to completely dry for at least 3 hours.

4. Application of PCI lastogum liquid applied waterproofing membrane.

5. The first coat should be applied with PCI lastogum red. Evaporation

time after first coat is minimum 3 hours at 23 degree and 50% relative humidity.

6. Sealing the corner and wall to floor and wall to wall joints by pressing

PCI pecitape 120 sealing tape onto the fresh first coat at corner or joints. Cut the tape to fit corners.

7. Sealing the pipe penetrations by using the fingers, stretch a PCI

pecitape 10X10 sealing gasket to give tight fit over the pipe. Place it in position, bedding it onto the fresh first coat.

8. Sealing a floor drain by cutting PCI pecitape 35X35 sealing gasket to suit drain system to be used. Place it in position, bedding it onto the fresh first coat. Insert loose flange of the floor outlet and screw down.

9. For wall application, apply the second coat of PCI lastogum gery

which is a one-component system. Or floor application, apply second coat of PCI lastogum grey, which is a two-component system.

10. Ensure the cured waterproofing membrane is dry and has not been

damaged before fixing marble.

11. Water testing as per requested in the specification, please refer to field quality control section.

12. Waterproofing need to be protected after water test.

Field quality control 1. Visual inspection

z Visually inspect waterproofing system installation thoroughly in presence of contractors representative for mock-up trail and bubbles formed in the waterproofing system or any defects will be made good as recommended by manufacturer.


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2. Testing of horizontal installation

z After allowing waterproofing system installation to completely cure and set, flood test horizontal installations with a minimum of 50mm of water for 24 hours examine for identify and repair any leaks.

z Make joint inspection with architects, consultants and main

contractors representative throughout the test. Record the testing result on inspection forms, taking record photos where necessary.

3. Water spray test to waterproofing system applied to wall

z For wall exceeding 300mm high only, joint inspection with architects, consultants and main contractors representative for water spray test will be arranged at least 72 hours (in any case, as per the manufacturers advise) after waterproofing membrane is applied.

z 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. Locate the pressure gauge at a distance not exceeding 1500mm from the shower head.

z Carefully make inspection of the other side of the waterproofed wall

surface to check any water seepage.

z Record the testing result, taking photo record where necessary. Protection

1. Ensure that all waterproofing are protected from traffic, weather and damage during construction. Repair or replace all damaged waterproofing before covering with other finish materials.

2. Protect all insulation from damage from wetting, loading or abuse until

they are under protective covering material or finish. 3. Protect adjacent surfaces and materials from damage and soiling by

the work of this section. Cleaning

1. Remove all debris after completion of the work of this section.

2. Clean adjacent surfaces and materials soiled by any work of this section.

WATERPROOFING LEGEND:UP TO SKIRTING

UP TO FALSE CEILING HEIGHTUP TO 2050mm A.F.F.L.UP TO 950mm A.F.F.L.

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Review No. B Date: 07-06-2006 HAZARD IDENTICATION SHEET Page 1 of 2

Project: Venetia Cotai, Macau Prefabricated Bathroom Work Package Code: WP 5115 (Top Builders) Subject: Waterproofing system (WP2) Analysis by: Edward Leung Location: Hotel Tower

Item Job Task Hazard People Affected Cause of Hazard Worst Harm

Due to Hazard

Existing Control Measures Remark

1 General works Personal injury worker and affected people nearby

- Lack of site safety knowledge

- Inappropriate use of PPE

Severely injured

- Worker should attend Safety Induction Training provided by GAMMON.

- Provide appropriate PPE to workers.

- Keep stock of PPE to be maintained for issuing.

2 Manual handling and transporting of material

Twisted , slipping, tripping, hit by objects Muscle strain During manual handling

workers - Using improper lifting method to handle goods

- poor housekeeping

- Worker did not wear and use PPE

Severely injured

- Provide pre-work body exercise to minimize the risk of injury.

- Wear long sleeve safety shoes to protect the ankle and foot..

- Use the mechanical equipment if possible.

- Always keep the workplace dry and tidy.

3 Materials

storage

Fire worker and affected people nearby

- Poor Housekeeping

- Smoking at the workplace and storage yards.

- Insufficient Ventilation

Fatality

- Flammable materials and goods must be kept away from the workplace.

- Provide fire extinguishers at the workplace and storage yards.

- Clean all the rubbish, paper, scraps all the time.

- Display no smoking signage and no smoking is allowed at the workplace.

- Adequate ventilation

Review No. B Date: 07-06-2006 HAZARD IDENTICATION SHEET Page 2 of 2

Item Job Task Hazard People Affected Cause of Hazard Worst Harm

Due to Hazard

Existing Control Measures Remark

4 Waterproofing application

Eye contact and skin contact worker nearby

- Improper use of PPE during the work.

Eye or skin irritation

- Wear safety goggles and gloves when working. .

- After application, worker must wipe off left-out substance and clean with soap and water.

5 Water proofing application on wall

Collapse of working platform worker and affected

people nearby

- Platform erected by non-experience competent workers.

Serious injury - Appointed Registered professional inspect and sign for the workability of working platform of height above 1.8m.


Fall of person at height worker - Inadequate platform being used by workers.

- Workers did not wear and use PPE.

Fatality - 200mm high toe-board and fence at 450mm and 900mm to be installed. - Prohibit to move the working platform if

any worker on it.


Falling objects from the working platform

Worker and affected people nearby

- Worker working under the working platform.

- No Warning sign

Severely injured

- Working platform should be closely planked with 200mm toe-board equipped.

- No other works shall be carried out under the activities that are working above.

- Chain block shall be used to the materials that are heavy in weight and large in size.

- Fence off the working area with barrier and notice / warning sign should be provided.

Review No. B Date: 07-06-2006 RISK ASSESSMENT SHEET Page 1 of 2

Note: Probability or Likelihood Rating: Almost Certain ( 5 ) Probable ( 4 ) Possible ( 3 ) Remote (2 ) Impossible (1)

Consequence Rating: Very High ( 5 ) High ( 4 ) Medium ( 3 ) Low ( 2 ) Very Low ( 1)

Risk Level: ( RED ) ( ORANGE ) ( YELLOW ) (GREEN)

Works Related Projects/Department: Venetia Cotai, Macau Works Related Projects/Department Code: 5115 (Top Builders) Type of Activity Operation: Prefabricated Bathroom Analysis by: Edward Leung Location: Hotel Tower

Rating of Harm Item Risk Existing Control Measures

Probability1 Consequences2 Risk

Level3 Recommended Action Remark

1 Personal injury - Worker should attend Safety Induction Training provided by GAMMON.

- Provided appropriate PPE as job required.

- Keep minimum stock of PPE to be maintained for issuing.

3

1

3 (Green)

Safety Induction Training, Specific PPE required

2 Twisted , slipping, tripping, hit by objects Muscle strain During manual handling

- Provide pre-work body exercise to minimize the risk of injury.

- Wear long sleeve safety shoes to protect the ankle and foot.

- Use the mechanical equipment if possible.

- Always keep the workplace dry and tidy.

2 2 4 (Green)

Morning Pre-work exercise

3 Fire - Flammable materials and goods must be kept away from the workplace. - Provide fire extinguishers at the

workplace and storage yards. - Clean all the rubbish, paper, scraps all

the time. - Display no smoking signage and no

smoking is allowed at the workplace. - Adequate ventilation

1 5 5 (Green)

Fire equipments Training, Specific Training

Review No. B Date: 07-06-2006 RISK ASSESSMENT SHEET Page 2 of 2

Note: Probability or Likelihood Rating: Almost Certain ( 5 ) Probable ( 4 ) Possible ( 3 ) Remote (2 ) Impossible (1)

Consequence Rating: Very High ( 5 ) High ( 4 ) Medium ( 3 ) Low ( 2 ) Very Low ( 1)

Risk Level: ( RED ) ( ORANGE ) ( YELLOW ) (GREEN)

Rating of Harm Item Risk Existing Control Measures

Probability1 Consequences2 Risk

Level3 Recommended Action Remark

4 Eye contact and skin contact

- Worker should attend Safety Induction Training provided by GAMMON.

- Provided appropriate PPE as job required.

- Keep minimum stock of PPE to be maintained for issuing.

- Sanitary facility should be provided for workers.

3 1 3 (Green)

Use of PPE s training

5 Collapse of working platform

- Appointed Registered professional inspect and sign for the workability of working platform of height above 1.8m.

3 3 9 (Yellow)

Specific Training

6 Fall of person at height - 200mm high toe-board and fence at

450mm and 900mm to be installed. - Prohibit to move the working platform if

any worker on it.

2 4 8 (Yellow)

Specific Training & Safety Harness required

7 Falling objects from the working platform

- Working platform should be closely planked with 200mm toe-board equipped.

- No other works shall be carried out under the activities that are working above.

- Chain block shall be used to the materials that are heavy in weight and large in size.

- Fence off the working area with barrier and notice / warning sign should be provided.

4 2 8 (Yellow)

Specific Training & Safety Harness required

method statement for waterproofing system of prefabricated bathroom

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