Large Glazing Panels Things To Know Before You Buy
Our sector professionals with years of very useful experience and knowhow prepare to assist you reach the ideal solution for your task. On schedule and done to perfection, Mapes is prepared to exceed your expectations in every means - replacement double glazing panels prices. spandrel panel window.STOPLESS BUTT-JOINT MULTIPLE CURTAINWALL SYSTEM BACKGROUND OF THE INVENTION 1.
CROSS REFERENCE TO THE RELATED APPLICATIONS This application is a continuation of U.S. Ser. No. 11/171,505 filed Jul. 1, 2005 now U.S. Pat No. 7,644,549, the entire contents of which is incorporated herein by reference. U.S. application Ser. No. 11/171,505 claims priority pursuant to 35 U.S.C §119(e) (1) of Provisional application No.
14, 2004, the disclosures of which are incorporated herein by reference. This application is based on Canadian Patent Application No. 2,472,902 filed Jul. 5, 2004. FIELD OF INVENTION The present invention relates generally to exterior building envelope finishing systems, and more particularly to improvements over curtain wall and window wall systems and the like.
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The exterior shell provides an insulating, weather-proof, generally air-tight and aesthetic cladding, but essentially no structural strength. The two most common types of exterior shell systems for such buildings are called “window wall†systems and “curtain wall†systems. In window wall systems, rigid panels of a manageable size and weight are prefabricated to roughly the same height as the spacing between adjacent pairs of concrete floor slabs.
These rigid panels can take on a variety of exterior appearances but in general they consist largely of clear glass panels (i. glazed spandrel panel.e. windows, which are referred to as “vision glass†in the industry) along with opaque glass or metal infill panels (these opaque glass panels are generally referred to as “spandrel glassâ€).
Most window wall systems are constructed of aluminum, although some may be of steel. A vertical cross-section of a typical window wall system is presented in FIG. 1. In the interest of simplicity, the rigid panels 10 are shown to consist of vision glass only, but combinations of vision glass, spandrel glass, and other finishing materials are also often used (replacement double glazed glass panels).
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The framed, rigid panels 10 are then placed between adjacent pairs of concrete floor slabs 16, 16′. In such an installation, caulking 18, 18′ is required at both the top and bottom of the rigid panels 10. In this figure, the faces of the concrete slabs are finished with a metal panel 20, which will typically be painted.
As noted above, regular window wall are sealed with caulking between the rigid panels and the floor slabs—eventually this caulking is going to break down and leakage will occur. The concrete floor slabs keep moving, mainly through winter and summer expansion and contraction cycles. This cycling keeps compressing and decompressing the rigid frames repeatedly, placing a strain on the caulking until it begins to break down.
Once the caulking joints start opening up, water will get into the system and damage both the window wall system and the building interior. This deterioration and long-term performance is a severe problem with window wall systems. Of course, the caulking must also be installed properly in the first place, which is not an easy task.
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If too thin a layer of caulking is applied, or if the surfaces are dirty, oily or wet when the caulking is applied, the seal may fail very quickly or be ineffective right from the beginning. Conventional curtain wall systems are similar to window wall systems in that they consist of prefabricated rigid panels which form a non-structural exterior cladding for the building.
They are sized to be of manageable size and weight, but are taller than window wall panels because they equal to the building's story height, rather than the distance between the slabs. A vertical cross-section of a typical curtain wall system is presented in FIG. 2. In this case, each pre-fabricated rigid panel 30 has been shown to consist of both vision glass 32 and spandrel glass 34, but any combination of vision glass, spandrel glass, sheet metal panels and other finishing materials may also be used.
Each bottom channel engages with the sprandrel glass 34 of the rigid panel 30 mounted below it. The big difference between curtain wall systems and window wall systems is that the rigid panels 30 of the curtain wall system are hung on the building structure, usually from floor to floor, each module being supported by connectors on the outer area of each concrete floor slab 16, 16′.
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That is, rather than the rigid panels fitting between the concrete slabs 16, 16′ as in the case of window wall systems, they hang from the slabs like curtains, sitting proud of the slab with each panel being sealed to the next with gaskets. In this arrangement, the rigid panels 30 of the curtain wall system are sealed to one another which minimizes the effect of thermal cycling.
Conventional curtain wall systems generally do not have the caulking/leakage problem of window wall systems, but they have problems of their own. To begin with, conventional curtain wall systems have a gap between the vision glass 32/spandrel glass 34 layer and the faces of the concrete slabs 16, 16′ which introduces problems with regard to sound transmission, and smoke and fire safing between individual floors.
A related problem is that conventional curtain wall systems have vertical mullions which run continuously from the bottom to the top of the building. These vertical mullions are hollow and boxed-shaped in cross-section, so they essentially act like a duct for the flow of sound and smoke between floors. The interiors of these vertical mullions are not sealed between floors and it would be very expensive and inconvenient to do so.
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The supply, layout and installation of these embedded anchors 38 is a costly item, particularly in high labor cost markets (glazed window panels). Curtain wall systems are mounted to the top of, or on the face of the concrete floor slabs 16, 16′ with one embedded anchor 38 taking care of each vertical mullion.
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