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
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
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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
Published on May 11, 2016
Published on May 11, 2016