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09 Chptr - 167 9 Cladding Glazing and Exterior Doors Key...

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167 9 Cladding Glazing, and Exterior Doors Key Terms Backer rod Break metal Capillary action Cladding Curtain wall Differential pressure Dry sealant Exterior insulation and finish system (EIFS) Elastomeric materials Gaskets Glazing Lockstrip Mullion Rain screen Safing Sealant joint Solid Surface tension Vapor barrier Vapor pressure Vapor retarder Wet sealant Key Concepts Cladding, like an interstitial ceiling space, represents a distinct design zone and should be treated as such in its design and construction. Objectives Distinguish between cladding and glazing systems. Describe the forces that cladding and glazing systems face. Identify the design challenges that cladding and glazing systems represent.
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Identify fundamentally good details involving cladding and glazing. 168 Purpose of Cladding, Glazing, and Exterior Doors While it has other definitions, cladding commonly refers to the nonload-bearing exterior enclosure of buildings (not including the roof). Its primary role is to protect the building frame and interior spaces from the intrusion of sound, water, wind, heat and cold, and sunlight. In fulfilling this role, the cladding system must mitigate secondary design issues such as thermal expansion (particularly significant with aluminum and glass cladding and glazing systems), moisture expansion, structural movement (short- and long-term), fire, and esthetics. Much like our own skin and physical features, cladding is a significant part of a building's identity. Glazing refers to the design, fabrication, and installation of glass in various framing systems, and it performs many of the functions cladding does; in fact, metal and glass systems frequently serve as the cladding system for a whole building. Exterior doors provide access to and egress from buildings by people and machines and, when thoughtfully and creatively integrated into an entrance, offer a warm welcome to a building's users. Cladding may consist of unit masonry or stone panels, precast concrete panels, glass fiber-reinforced concrete (GFRC), metal and glass, or a system of plastic foam boards attached to a backup wall (called an exterior insulation and finish system, or EIFS), or combinations of these systems. A variety of glazing and exterior door systems exist as well. Effectively resisting the elements just described and articulating the solutions to other design problems characteristic of a building's exterior results in a variety of challenging and interesting details. Table 9.1 is a matrix of common design issues involving cladding, glazing, and exterior door systems. The solutions that are developed to resolve them are reflected in the drawings set and specifications. They manifest two design philosophies for cladding and glazing systems and exterior doors: (1) create a barrier to the elements, and (2) develop a system that resists the elements but acknowledges and mitigates problems caused by imperfections in the barrier. Of the two approaches, the second represents the most prudent philosophy to the design of cladding and glazing systems and exterior doors.
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