Back pans are metal sheets, usually aluminum or galvanized steel, that are attached and sealed to the curtain wall framing around the perimeter behind opaque areas of a curtain wall. Shadow box construction creates a perception of depth behind the spandrel glass that is sometimes desired. The sightlines are a function of both the width and depth of the curtain wall frame. Also placing the stack joint above the floor provides a more convenient location for field workers to achieve the critical seal at the four-way intersection. The interlocking legs of the horizontal mullions are the most critical interface of a unitized system. Careful integration with adjacent elements such as other wall claddings, roofs, and base of wall details is required for a successful installation.
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More robust systems will also include a gasket at the interior interlock.
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The challenge is to strive for the highest visible light transmittance VT and the lowest solar heat gain coefficient SHGC while not preventing the glass from being too reflective when viewed from both the exterior and the interior, while controlling glare. Aluminum frames are generally painted or anodized.
Weep holes in a water-managed system function largely to drain water that enters the glazing pocket while weep holes in a pressure-equalized system function primarily as vents to allow air movement between the exterior and glazing pocket. This system provides reasonable performance but is susceptible to leaks at corners or joints in dry gaskets.
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This is where field labor must seal between adjacent units to achieve a weather tight wall. Interior and exterior glazed systems offer different advantages and disadvantages.
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Details are not provided for interior glazed systems because air For high-rise construction interior glazing is sometimes used due to A true thermal break is ¼" thick minimum and can be up to 1" or more. Shop drawing coordination: Require curtain wall installation shop drawings showing all adjacent.
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Repairs require exterior access. Note that the easiest way to recognize a pressure-equalized rain screen system is yo note that the that glazing pocket around each individual unit of glass is isolated air tight from adjacent units, most obviously with plugs or seals at the gaps between screw splines at mullion intersections.
Careful integration with adjacent elements such as other wall claddings, roofs, and base of wall details is required for a successful installation. Minimize the proportion of framing exposed to the outdoors. Gaskets are also used to cushion the glass on the interior and exterior faces of the glass.
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The details associated with this section of the BEDG on the WBDG were developed by committee and are intended solely as a means to illustrate general design and construction concepts only.
REGISTRAZIONE PRIMA NOTA DI
|The outside face of glass, exterior glazing materials and the outer exposed face of aluminum framing function as a rain screen, shedding water away.
Establish the required Condensation Resistance Factor CRF based on anticipated interior humidity and local climate data and select a curtain wall with an appropriate CRF. It is thus recommended that projects specifying unitized curtain wall systems incorporate a team member who has a breadth of experience in designing and working with unitized systems.
Field testing of curtain walls: Require the field testing of curtain walls for air infiltration and water penetration resistance, for quality assurance of curtain wall fabrication and installation.
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The interlocking leg in the plane of the glazing pocket will be sealed by gaskets and is the primary line of defense against water and air infiltration.
See discussion of back pans below.
Curtain walls and perimeter sealants require maintenance to maximize the service life of the curtain walls.