Lecture 22- Exterior Cladding Systems a.k.a skins
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Transcript of 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 & MethodsFall 2008
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Cladding/ Curtain Wall
• Constructed in Place• Prefabricated
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CladdingA.K.A
SkinCurtain 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.
(b) The architect prepares a rough design and
performance specification and submit these to several manufacturers for proposals.
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STICK
1. Anchor2. Mullion3. Horz rail4. Spandrel panel5. Horz rail6. Glass
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Constructed in PlaceStiffening Method• Steel Sub Frame• Back-up Wall of Masonry• Back-up Wall of Light Gauge
Studs
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PrefabricatedMethod 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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