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New York April 21, 2016

Facade Retrofitting Method with an inverted drainage system

BT Tan YKK AP FACADE PTE. LTD.1


High Street Centre Singapore Built: 1974 Usage: Commercial Office Floors: 31 (7 story podium and 24 story tower) Height: 400 ft. (122m) Owner: Management Corporation Strata Title Surrounded by notable government buildings including the Parliament House and the High Court.

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Project Scope 1.  Remove existing tower facade entirely. 2.  Install new Unitized Curtain Wall System. 3.  Extend roof crown 70 ft height.

Before

Work Challenges: •  Business as usual for existing tenants •  Safety of workers, tenants and the public •  Minimum disruption and noise •  Full weather-tightness during construction

During 3


A Retrofitting Method Solution

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Comparison: Unitized Curtain Wall Drainage Systems Conventional Unitized Bottom-up System

Conventional Splice Plate

Innovative Unitized

Top-Down System

INVERTED Splice Plate

Although a totally opposite installation method, the inverted splice plate performs and functions as a conventional system.

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Advantages of the Top-Down vs. Bottom Up Retrofit Method

Bottom-up

Top-Down

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vs.

Top-Down Method

Activity cycle turnaround time 3 days

12 days

2

9 days

3 days

3

Shorter 3

3 days

3 days

2

4

3 days

3 days

1

6 floors at each period of time 5

6

3 days

Duration affecting tenant: 33 days

4 floors at each period of time Duration affecting tenant: 21 days

Night work

Day work

4

1

Day work

Night work

Bottom-Up Method

12 days 7


Top-Down Method

Less exposure to weather

4

2

3

3

2

4

1

5

6

Additional temporary rain screen barrier

Night work

Day work

1

vs.

Day work

Night work

Bottom-Up Method

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1

vs.

Top-Down Method

Reduced risk of falling debris

3

2

RISK!

2

4

1

5

6

Demolition ABOVE new cladding

Demolition BELOW new cladding

Night work

Day work

3

4 Day work

Night work

Bottom-Up Method

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Bottom-Up Method

vs.

Top-Down Method

Shorter installation turn around time Less exposure to weather

1

4

Reduced risk of falling debris

2

3

3 COST Less temporary protection and cleaning

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Additional safety platform

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Additional temporary rain screen barrier

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Additional heavy duty protection screen

2

1

Night work

Day work

SAFETY

Day work

Night work

TIME

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TOP-DOWN METHOD: Monthly Progress Pictures

Mth 1

Mth 9

Mth 4

Mth 5

Mth 10

Mth 6

Mth 11

Mth 7

Mth 8

Mth 14

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Before and After: Internal

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Why Facade Retrofitting Method Matters: •  Aged building - Precondition survey ü  No proper as built record ü  Structure strength

•  Occupied building - Operational constraints ü  ü  ü  ü  ü 

Working hours Noise Safety Security Interfacing finishes

•  Facade specialist - General contractor role ü  Liaison with authority ü  Total project management

Contractor Assumes All Risk! 13


THANK YOU! YKK AP FACADE PTE. LTD. Headquartered in Singapore, YKK AP FACADE Pte. Ltd. specializes in architectural building facade projects throughout Asia. tanbt@ykkapfacade.com www.ykkapfacade.com Recent projects: Gardens by the Bay Wilkinson Eyre

Reflections Studio Daniel Libeskind

South Beach CapitaGreen Building Foster & Partners Ito Toyo 14

Methods+Materials Speaker - Bang Ting “BT” Tan (YKK AP Facade, Singapore), Facades+ NYC 2016  
Methods+Materials Speaker - Bang Ting “BT” Tan (YKK AP Facade, Singapore), Facades+ NYC 2016