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

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.

2

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

4

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.

5

Advantages of the Top-Down vs.

Bottom Up Retrofit Method

Bottom-up

Top-Down

6

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

8

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

9

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

4

Additional safety platform

5

Additional temporary rain screen barrier

6

Additional heavy duty protection screen

2

1

Night work

Day work

SAFETY

Day work

Night work

TIME

10

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

11

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!

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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