Lecture 22- Exterior Cladding Systems a.k.a skins

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Lecture 22- Exterior Cladding Systems a.k.a skins

• ARCH 330
• Materials Methods
• Fall 2008

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Cladding/ Curtain Wall

• Constructed in Place
• Prefabricated

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Cladding

• A.K.A
• Skin
• Curtain Wall glass metal systems

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Cladding

• Non-load bearing exterior wall enclosure.
• Most visible, most subject to attack by natural
  forces.
• Separates indoor environment from outdoors in
  such a way that the indoor environment can be
  maintained at a level suitable for the building's
  intended use.

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Primary Functions of Cladding

• Keep Water Out
• Prevent Air Leakage
• Control Light (heat, glare, ultraviolet)
• Control Radiation of Heat 
• Control Conduction of Heat
• Control Water Vapor 
• Control Sound

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Secondary Functions of Cladding

• Resist Wind Forces 
• Adjust to Movement
• Thermal expansion and contraction,
• Moisture expansion and contraction,
• Structural deflections.
• Resist Fire
• Weather Gracefully

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Forces that Move Water

• Gravity
• Momentum
• Surface Tension
• Capillary Action
• Wind/ Air Currents

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Rainscreen Principle

• Let wind pressure differences between the outside
  and inside neutralize themselves

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PECPressure Equalization Chamber

• Pressure equalized wall design
• Airtight barrier at the internal side
• Rainscreen - loose fitting jointed layer
• Current of air can pass back and forth through
  the unsealed joints.

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Sealant Joints in Cladding

• Fill/seal the joints
• Prevent flow of air and/or water
• Permit assembly tolerance
• Permit movement

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Design Process - Prefabricated 

• (a) Curtain wall manufacturer selected and
  made a part of the building design team from the
  first stages of the project.
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• (b) The architect prepares a rough design and
  performance specification and submit these to
  several manufacturers for proposals.

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• STICK
• 1. Anchor
• 2. Mullion
• 3. Horz rail
• 4. Spandrel panel
• 5. Horz rail
• 6. Glass

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Constructed in Place

• Stiffening Method
• Steel Sub Frame
• Back-up Wall of Masonry
• Back-up Wall of Light Gauge Studs

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Prefabricated

• Method of Assembly
• Stick
• Unit
• Unit Mullion
• Panel
• Column Cover Sprandrel

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Masonry

• Constructed in place
• Prefabricated

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Metal Glass

• Prefabricated

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• Structural Glass

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• Gehry - Guggenheim

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Nicholas Grimshaw and Partners Ludwig Erhard Haus
Financial Centre