Glass curtain wall of the Bauhaus Dessau.

Curtain wall is a term used to describe a building façade which does not carry any dead load from the building other than its own dead load. These loads are transferred to the main building structure through connections at floors or columns of the building. A curtain wall is designed to resist air and water infiltration, wind forces acting on the building, seismic forces, and its own dead load forces. Image File history File links Download high resolution version (965x1639, 611 KB) Bauhaus-Dessau Ateliergebäude (Glasecke) own photograph 2005. ... Image File history File links Download high resolution version (965x1639, 611 KB) Bauhaus-Dessau Ateliergebäude (Glasecke) own photograph 2005. ... For the British gothic rock band, see Bauhaus (band). ... Dessau is a town in Germany on the junction of the rivers Mulde and Elbe, in the Bundesland (Federal State) of Saxony-Anhalt. ... West façade of the Notre-Dame de Strasbourg Cathedral A facade (or façade) is the exterior of a building – especially the front, but also sometimes the sides and rear. ... Dead load and live load are terms used in the structural engineering, construction, and associated industries, and refer to the two categories of primary loads. ... Seismology (from the Greek seismos = earthquake and logos = word) is the scientific study of earthquakes and the movement of waves through the Earth. ...

Curtain walls are typically designed with extruded aluminium members, although the first curtain walls were made of steel. The aluminium frame is typically infilled with glass, which provides an architecturally pleasing building, as well as benefits such as daylighting. However, parameters related to solar gain control, such as thermal comfort and visual comfort are more difficult to control when using highly-glazed curtain walls. Other common infills include: stone veneer, metal panels, louvers, and operable windows or vents. Daylighting is the practice of placing windows, or other transparent media, and reflective surfaces so that, during the day, natural light provides effective internal illumination. ... Human thermal comfort is the state of mind that expresses satisfaction with the surrounding environment, according to ASHRAE Standard 55. ... Kaiser Medical Center in Richmond, California has infilled its employee parking to expand the hospitals emergency services department. ...

Curtain walls differ from storefront systems in that they are designed to span multiple floors, and take into consideration design requirements such as: thermal expansion and contraction; building sway and movement; water diversion; and thermal efficiency for cost-effective heating, cooling, and lighting in the building. This article does not cite any references or sources. ...

History

Medieval curtain wall

Curtain wall is used to describe the set of walls that surround and protect the interior (bailey) of a medieval castle. These walls are often connected by a series of towers or mural towers to add strength and provide for better defense of the ground outside the castle, and are connected like a curtain draped between these posts. Additional provisions and buildings were often enclosed by such a construction, designed to help a garrison last longer during a siege by enemy forces. Examples of curtain walls as part of castles are at Muchalls Castle, Scotland and Dunstanburgh Castle, England, the latter of which is in a ruined state. Places In the United Kingdom: Bailey, Lancashire Bailey is the name of one of the British Sea Areas The Bailey, the historic centre of Durham, England In Canada: Bailey, New Brunswick Bailey Corners, Ontario Baileys Beach, Ontario Baileys Brook, Nova Scotia In the United States of America: Bailey... The Middle Ages formed the middle period in a traditional schematic division of European history into three ages: the classical civilization of Antiquity, the Middle Ages, and modern times. ... For other uses, see Castle (disambiguation). ... For religious use, see Veil. ... For people named Garrison, see Garrison (disambiguation) Garrison House, built by William Damm in 1675 at Dover, New Hampshire Garrison (from the French garnison, itself from the verb garnir, to equip) is the collective term for the body of troops stationed in a particular location, originally to guard it, but... A siege is a military blockade of a city or fortress with the intent of conquering by force or attrition, often accompanied by an assault. ... Muchalls Castle, Aberdeenshire Muchalls Castle stands overlooking the North Sea in the countryside of Kincardine and Mearns, Aberdeenshire, Scotland. ... This article is about the country. ... Dunstanburgh Castle. ... For other uses, see England (disambiguation). ...

Modern curtain wall

A building project in Wuhan China, the difference in progress between the two towers illustrates the relationship between the inner load bearing structure and the exterior glass curtain.

Prior to the early-20th Century, buildings were constructed with the exterior walls of the building supporting the load of the entire structure. With the advent of the structural concept of shear walls and building cores, the exterior walls of buildings no longer had to support high dead loads and could be designed as much lighter and more open than the brick and steel facades of the past. This gave way to increased use of glass as an exterior façade, and the modern day curtain wall was born. Image File history File links Metadata Size of this preview: 800 × 599 pixelsFull resolution‎ (2,848 × 2,134 pixels, file size: 1. ... Image File history File links Metadata Size of this preview: 800 × 599 pixelsFull resolution‎ (2,848 × 2,134 pixels, file size: 1. ... For the brand of cymbal, see Wuhan cymbals. ... Shear Wall in Structural Engineering refers to structural wall that can be either load bearing or non-load bearing. Shear Walls are a type of structural system that provides lateral resistance to a building or structure. ...

The first curtain walls were made with steel mullions, and the plate glass was attached to the mullions with asbestos or fiberglass modified glazing compound. Eventually silicone sealants or glazing tape were substituted. Some designs included an outer cap to hold the glass in place and to protect the integrity of the seals. The first curtain wall installed in New York City was this type of construction. Earlier modernist examples are the Bauhaus in Dessau and the Hallidie Building in San Francisco. The 1970’s began the widespread use of aluminum extrusions for mullions. Aluminum offers the unique advantage of being able to be easily extruded into nearly any shape required for design and aesthetic purposes. Today, the design complexity and shapes available are nearly limitless. Custom shapes can be designed and manufactured with relative ease. Mullion, Cornwall is also the name of a village in Cornwall off the Lizard. ... Silicones (more accurately called polymerized siloxanes or polysiloxanes) are inorganic-organic polymers with the chemical formula [R2SiO]n, where R = organic groups such as methyl, ethyl, and phenyl. ... Self-leveling silicone firestop system used around pipe through-penetration in a two-hour fire-resistance rated concrete floor assembly. ... Lever House, designed by Gordon Bunshaft of Skidmore, Owings and Merrill and located at 390 Park Avenue in New York City, is the quintessential and seminal glass box International Style skyscraper, and holds the distinction of being the first curtain wall in New York City. ... New York, New York and NYC redirect here. ... This article focuses on the cultural movement labeled modernism or the modern movement. See also: Modernism (Roman Catholicism) or Modernist Christianity; Modernismo for specific art movement(s) in Spain and Catalonia. ... For the British gothic rock band, see Bauhaus (band). ... Dessau is a town in Germany on the junction of the rivers Mulde and Elbe, in the Bundesland (Federal State) of Saxony-Anhalt. ... The Hallidie Building, is an office building in San Franciscos Financial District. ... This page is a candidate for speedy deletion. ... Extruded aluminium; slots allow bars to be joined with special connectors. ...

Similarly, sealing methods and types have evolved over the years, and as a result, today’s curtain walls are high performance systems which require little maintenance.

Stick systems

The vast majority of curtain walls are installed long pieces (referred to as sticks) between floors vertically and between vertical members horizontally. Framing members may be fabricated in a shop environment, but all installation and glazing is typically performed at the jobsite. Glazing, in architecture, is a transparent part of a wall, usually made of glass or plastic (acrylic and polycarbonate). ...

Unitized systems

Unitized curtain walls entail factory fabrication and assembly of panels and may include factory glazing. These completed units are hung on the building structure to form the building enclosure. Unitized curtain wall has the advantages of: speed; lower field installation costs; and quality control within an interior climate controlled environment. The economic benefits are typically realized on large projects or in areas of high field labor rates.

Rainscreen principle

A common feature in curtain wall technology, the rainscreen principle theorizes that equilibrium of air pressure between the outside and inside of the "rainscreen" prevents water penetration into the building itself. For example the glass is captured between an inner and an outer gasket in a space called the glazing rebate. The glazing rebate is ventilated to the exterior so that the pressure on the inner and outer sides of the exterior gasket is the same. When the pressure is equal across this gasket water cannot be drawn through joints or defects in the gasket.

Design

Curtain wall systems must be designed to handle all loads imposed on it as well as keep air and water from penetrating the building envelope.

Loads

The loads imposed on the curtain wall are transferred to the building structure through the anchors which attach the mullions to the building. The building structure needs to be designed and account for these loads.

Dead load

Dead load is defined as the weight of structural elements and the permanent features on the structure. In the case of curtain walls, this load is made up of the weight of the mullions, anchors, and other structural components of the curtain wall, as well as the weight of the infill material. Additional dead loads imposed on the curtain wall, such as sunshades, must be accounted for in the design of the curtain wall components and anchors.

Wind load

Wind load acting on the building is the result of wind blowing on the building. This wind pressure must be resisted by the curtain wall system since it envelops and protects the building. Wind loads vary greatly throughout the world, with the largest wind loads being near the coast in hurricane-prone regions. Building codes are used to determine the required design wind loads for a specific project location. Often, a wind tunnel study is performed on large or unusually shaped buildings. A scale model of the building and the surrounding vicinity is built and placed in a wind tunnel to determine the wind pressures acting on the structure in question. These studies take into account vortex shedding around corners and the effects of surrounding buildings. For other uses, see Wind (disambiguation). ... This article is about pressure in the physical sciences. ... This article is about weather phenomena. ... A building code, or building control, is a set of rules that specify the minimum acceptable level of safety for constructed objects such as buildings and nonbuilding structures. ... NASA wind tunnel with the model of a plane A wind tunnel is a research tool developed to assist with studying the effects of air moving over or around solid objects. ... Vortex shedding is an unsteady flow that takes place in special flow velocities (according to the size and shape of the cylindrical body). ...

Seismic load

Seismic loads need to be addressed in the design of curtain wall components and anchors. In most situations, the curtain wall is able to naturally withstand seismic and wind induced building sway because of the space provided between the glazing infill and the mullion. In tests, standard curtain wall systems are able to withstand three inches (75 mm) of relative floor movement without glass breakage or water leakage. Anchor design needs to be reviewed, however, since a large floor-to-floor displacement can place high forces on anchors. Seismology (from the Greek seismos = earthquake and logos = word) is the scientific study of earthquakes and the propagation of elastic waves through the Earth. ...

Snow load

Snow loads and live loads are not typically an issue in curtain walls, since curtain walls are designed to be vertical or slightly inclined. If the slope of a wall exceeds 20 degrees or so, these loads may need to be considered. Dead load and live load are terms used in the structural engineering, construction, and associated industries, and refer to the two categories of primary loads. ...

Thermal load

Thermal loads are induced in a curtain wall system because aluminum has a relatively high coefficient of thermal expansion. This means that over the span of a couple of floors, the curtain wall will expand and contract some distance, relative to its length and the temperature differential. This expansion and contraction is accounted for by cutting horizontal mullions slightly short and allowing a space between the horizontal and vertical mullions. In unitized curtain wall, a gap is left between units, which is sealed from air and water penetration by wiper gaskets. Vertically, anchors carrying wind load only (not dead load) are slotted to account for movement. Incidentally, this slot also accounts for live load deflection and creep in the floor slabs of the building structure. Aluminum is a soft and lightweight metal with a dull silvery appearance, due to a thin layer of oxidation that forms quickly when it is exposed to air. ... During heat transfer, the energy that is stored in the intermolecular bonds between atoms changes. ... This article is about mechanical seals. ... Creep is the term used to describe the tendency of a material to move or to deform permanently to relieve stresses. ...

Blast load

Accidental explosions and terrorist threats have brought on increased concern for the fragility of a curtain wall system in relation to blast loads. The bombing of the Alfred P. Murrah Federal Building in Oklahoma City, Oklahoma, has spawned much of the current research and mandates in regards to building response to blast loads. Currently, all new federal buildings in the U.S., and all U.S. embassies built on foreign soil, must have some provision for resistance to bomb blasts. Alfred P. Murrah building four days before its demolition Alfred P. Murrah building during demolition Aerial view of Alfred P. Murrah building after bombing The Alfred P. Murrah Federal Building was a United States Federal Government complex located at 200 N.W. 5th Street in downtown Oklahoma City, Oklahoma. ... Downtown Oklahoma City The State Capitol of Oklahoma From The South Motto: Nickname: Capital of the New Century Founded 1889 Incorporated County Oklahoma County Cleveland County Canadian County Borough {{{borough}}} Parrish {{{parrish}}} Mayor Mick Cornett Area  - Total  - Water 1,608. ... For other uses, see Oklahoma (disambiguation). ...

Since the curtain wall is at the exterior of the building, it becomes the first line of defense in a bomb attack. As such, blast resistant curtain walls must be designed to withstand such forces without compromising the interior of the building to protect its occupants. Since blast loads are very high loads with short durations, the curtain wall response should be analyzed in a dynamic load analysis, with full-scale mock-up testing performed prior to design completion and installation. In physics, dynamics is the branch of classical mechanics that is concerned with the effects of forces on the motion of objects. ... This page is a candidate for speedy deletion. ...

Blast resistant glazing consists of laminated glass, which is meant to break but not separate from the mullions. Similar technology is used in hurricane-prone areas for the protection from wind-borne debris. Laminated glass is a type of safety glass that holds together when shattered. ... This article is about weather phenomena. ...

Infiltration

Air infiltration is the air which passes through the curtain wall from the exterior to the interior of the building. The air is infiltrated through the gaskets, through imperfect joinery between the horizontal and vertical mullions, through weep holes, and through imperfect sealing. The American Architectural Manufacturers Association (AAMA) is the governing body in the U.S. which sets the acceptable levels of air infiltration through a curtain wall. This limit is expressed (in America) in cubic feet per minute per square foot of wall area at a given test pressure. (Currently, most standards cite less than 0.6 CFM/sq ft as acceptable). Mullion, Cornwall is also the name of a village in Cornwall off the Lizard. ...

Water penetration is defined as any water passing from the exterior of the building through to the interior of the curtain wall system. Sometimes, depending on the building specifications, a small amount of controlled water on the interior is deemed acceptable. To test the ability of a curtain wall to withstand water penetration, a water rack is placed in front a mock-up of the wall with a positive air pressure applied to the wall. This represents a wind driven heavy rain on the wall. Field tests are also performed on installed curtain walls, in which a water hose is sprayed on the wall for a specified time. In engineering and manufacturing, the term specification has the following meanings: Technical requirement An essential technical requirement for items, materials, or services, including the procedures to be used to determine whether the requirement has been met. ...

Deflection

One of the disadvantages of using aluminum for mullions is that its modulus of elasticity is about one-third that of steel. This translates to three times more deflection in an aluminum mullion compared to the same steel section. Building specifications set deflection limits for perpendicular (wind-induced) and in-plane (dead load-induced) deflections. It is important to note that these deflection limits are not imposed due to strength capacities of the mullions. Rather, they are designed to limit deflection of the glass (which may break under excessive deflection), and to ensure that the glass does not come out of its pocket in the mullion. Deflection limits are also necessary to control movement at the interior of the curtain wall. Building construction may be such that there is a wall located near the mullion, and excessive deflection can cause the mullion to contact the wall and cause damage. Also, if deflection of a wall is quite noticeable, public perception may raise undue concern that the wall is not strong enough. In solid mechanics, Youngs modulus (also known as the modulus of elasticity or elastic modulus) is a measure of the Stiffness of a given material. ... This article or section does not cite any references or sources. ...

Deflection limits are typically expressed as the distance between anchor points divided by a constant number. A deflection limit of L/175 is common in curtain wall specifications. Say a given curtain wall is anchored at 12 foot (144 in) floor heights. The allowable deflection would then be 144/175 = 0.823 inches, which means the wall is allowed to deflect inward or outward a maximum of 0.823 inches at the maximum wind pressure.

Deflection in mullions is controlled by different shapes and depths of curtain wall members. The depth of a given curtain wall system is usually controlled by the area moment of inertia required to keep deflection limits under the specification. Another way to limit deflections in a given section is to add steel reinforcement to the inside tube of the mullion. Since steel deflects at 1/3 the rate of aluminum, the steel will absorb much of the system’s deflection at a lower cost or smaller depth. The second moment of area, also known as the area moment of inertia or second moment of inertia, is a property of a shape that is used to predict its resistance to bending and deflection which are directly proportional. ...

Stress

Contrary to popular belief, stress is not related to deflection; it is a separate criterion in curtain wall design and analysis. For example, the advantage of some curtain wall designs is the ability to span more than one floor (commonly known as twin-span or multi-span, as opposed to single or simple span). Multiple floor spans significantly reduce the required area moment of inertia for a mullion. The stresses in the mullion, however, are significantly increased in a multiple span, giving way for a higher required section modulus (S, expressed in cubic inches) in the mullion. Stress is a measure of force per unit area within a body. ... I NEED TO FUCK SOMEONE! I AM TIRED OF PORN! SOMEONE HELP ME! ... Structural analysis comprises the set of physical laws and mathematics required to study and predict the behavior of structures. ... Span is a section between two intermediate supports of a bridge. ... Moment of inertia, also called mass moment of inertia and, sometimes, the angular mass, (SI units kg m², Former British units slug ft2), is the rotational analog of mass. ...

As mentioned above, the deflection of aluminum is three times greater than an equivalent steel shape under the same load. However, the allowable stress in that same aluminum member may be roughly equivalent to or higher than its steel counterpart. This means that aluminum mullions can be as strong as or stronger than steel members. Permissible stress design (in American construction more commonly called allowable stress design) is a design philosophy used by civil engineers. ...

Thermal criteria

Relative to other building components, aluminum has a high heat transfer coefficient, meaning that aluminum is a very good conductor of heat. This translates into high heat loss through aluminum curtain wall mullions. There are several ways to compensate for this heat loss, the most common way being the addition of thermal breaks. Thermal breaks are barriers between exterior metal and interior metal, usually made of polyvinyl chloride (PVC). These breaks provide a significant decrease in the thermal conductivity of the curtain wall. However, since the thermal break interrupts the aluminum mullion, the overall moment of inertia of the mullion is reduced and must be accounted for in the structural analysis of the system. Heat conduction or thermal conduction is the spontaneous transfer of thermal energy through matter, from a region of higher temperature to a region of lower temperature, and hence acts to even out temperature differences. ... An element of low heat conductivity placed in an assembly to reduce or prevent the flow of heat between highly conductive materials; used in some metal window or curtain wall designs intended for installation in cold climates. ... Polyvinyl chloride Polyvinyl chloride, (IUPAC Polychloroethene) commonly abbreviated PVC, is a widely used thermoplastic polymer. ...

Thermal conductivity of the curtain wall system is important because of heat loss through the wall, which affects the heating and cooling costs of the building. On a poorly performing curtain wall, condensation may form on the interior of the mullions. This could cause damage to adjacent interior trim and walls. For other uses, see Condensation (disambiguation). ...

Rigid insulation is provided in spandrel areas to provide a higher R-value at these locations. Thermal insulation on the Huygens probe The term thermal insulation can refer to materials used to reduce the rate of heat transfer, or the methods and processes used to reduce heat transfer. ... A spandrel is originally a term from Architecture, but has more recently been given an analogous meaning in Evolutionary biology. ... The R-value is a measure of thermal resistance. ...

Infills

Infill refers to the large panels that are inserted into the curtain wall between mullions. Infills are typically glass but may be made up of nearly any exterior building element.

Regardless of the material, infills are typically referred to as glazing, and the installer of the infill is referred to as a glazier. Glazier is a profession in which the person cuts flat glass to size as well as carpentery tasks. ...

Glass

The Mexican hothouse at the Jardin des Plantes, built by Charles Rohault de Fleury from 1834 to 1836, is an early example of metal and glass curtain wall architecture.

By far the most common glazing type, glass can be of an almost infinite combination of color, thickness, and opacity. For commercial construction, the two most common thicknesses are 1/4 inch (6 mm) monolithic and 1 inch (25 mm) insulating glass. Presently, 1/4 inch glass is typically used only in spandrel areas, while insulating glass is used for the rest of the building (sometimes spandrel glass is specified as insulating glass as well). The 1 inch insulation glass is typically made up of two 1/4-inch lites of glass with a 1/2 inch (12 mm) airspace. The air inside is usually atmospheric air, but some inert gases, such as argon, may be used to offer better thermal transmittance values. In residential construction, thicknesses commonly used are 1/8 inch (3 mm) monolithic and 5/8 inch (16 mm) insulating glass. Larger thicknesses are typically employed for buildings or areas with higher thermal, relative humidity, or sound transmission requirements, such as laboratory areas or recording studios. Image File history File linksMetadata No higher resolution available. ... Image File history File linksMetadata No higher resolution available. ... The Royal Greenhouses of Laeken. ... The Jardin des Plantes is the main botanical garden in France. ... Float glass is made by melting raw materilas consisting of sand, limestone, soda ash, dolomite, iron oxide and salt cake. ... A substance or object that is opaque is neither transparent nor translucent. ... Insulated Glazing Unit or Insulating Glass Unit (commonly referred to as IGU) is described as two or more lites of glass spaced apart and hermetically sealed to form a single glazed unit with an air space between each lite. ... An inert gas is any gas that is not reactive under normal circumstances. ... Thermal transmittance, also known as U-value, is the rate of transfer of heat (in watts) through one square metre of a structure divided by the difference in temperature across the structure. ... A hygrometer used to measure the humidity of air. ... It has been suggested that this article or section be merged into Architectural acoustics. ... ==Individual Studio== A recording studio is a facility for sound recording. ...

Glass may be used which is transparent, translucent, or opaque, or in varying degrees thereof. Transparent glass usually refers to vision glass in a curtain wall. Spandrel or vision glass may also contain translucent glass, which could be for security or aesthetic purposes. Opaque glass is used in areas to hide a column or spandrel beam or shear wall behind the curtain wall. Another method of hiding spandrel areas is through shadow box construction (providing a dark enclosed space behind the transparent or translucent glass). Shadow box construction creates a perception of depth behind the glass that is sometimes desired. Transparent glass ball In optics, transparency is the property of allowing light to pass. ... In optics, transparency is the property of being transparent, or allowing light to pass. ...

Stone veneer

Thin blocks (3 to 4 inches (75-100 mm)) of stone can be inset within a curtain wall system to provide architectural flavor. The type of stone used is limited only by the strength of the stone and the ability to manufacture it in the proper shape and size. Common stone types used are: Arriscraft(calcium silicate);granite; marble; travertine; and limestone. The stone may come in several different finishes, which adds many more options for architects and building owners. For other uses, see granite (disambiguation). ... For other uses, see Marble (disambiguation). ... Travertine Travertine terraces at Mammoth Hot Springs, Yellowstone National Park A carving in travertine Travertine is a sedimentary rock. ... For other uses, see Limestone (disambiguation). ...

Panels

Metal panels can take various forms including aluminum plate; thin composite panels consisting of two thin aluminum sheets sandwiching a thin plastic interlayer; and panels consisting of metal sheets bonded to rigid insulation, with or without an inner metal sheet to create a sandwich panel. Other opaque panel materials include FRP (fiber-reinforced plastic) and stainless steel.

Louvers

A louver is provided in an area where mechanical equipment located inside the building requires ventilation or fresh air to operate. They can also serve as a means of allowing outside air to filter into the building to take advantage of favorable climatic conditions and minimize the usage of energy-consuming HVAC systems. Curtain wall systems can be adapted to accept most types of louver systems to maintain the same architectural sightlines and style while providing the necessary functionality.f A louver (or louvre in British English, from French louvert; the open one) is a frame with horizontal and vertical slats, which are angled to admit light and air, but to keep out rain and sun shine. ... HVAC may also stand for High-voltage alternating current HVAC systems use ventilation air ducts installed throughout a building that supply conditioned air to a room through rectangular or round outlet vents, called diffusers; and ducts that remove air from return-air grilles Fire-resistance rated mechanical shaft with HVAC...

Windows and vents

Most curtain wall glazing is fixed, meaning there is no access to the exterior of the building except through doors. However, windows or vents can be glazed into the curtain wall system as well, to provide required ventilation or operable windows. Nearly any window type can be made to fit into a curtain wall system.

Fire safety

Effects of fire having "leapfrogged" up a building in Brasilia 27. December 2005, destroying glass panes on the way up, sending shards down. The framework is still in place here because it is made of steel. Aluminium melts at 660°C. Building fires reach ca. 1000°C very rapidly.

Combustible Polystyrene insulation in point contact with sheet metal backban. Incomplete firestop in the perimeter slab edge, made of rockwool without topcaulking.

Firestopping at the "perimeter slab edge", which is a gap between the floor and the backpan of the curtain wall is essential to slow the passage of fire and combustion gases between floors. Spandrel areas must have non-combustible insulation at the interior face of the curtain wall. Some building codes require the mullion to be wrapped in heat-retarding insulation near the ceiling to prevent the mullions from melting and spreading the fire to the floor above. It is important to note that the firestop at the perimeter slab edge is considered a continuation of the fire-resistance rating of the floor slab. The curtain wall itself, however, is not ordinarily required to have a rating. This causes a quandary as Compartmentalization (fire protection) is typically based upon closed compartments to avoid fire and smoke migrations beyond each engaged compartment. A curtain wall by its very nature prevents the completion of the compartment (or envelope). The use of fire sprinklers has been shown to mitigate this matter. As such, unless the building is sprinklered, fire may still travel up the curtain wall, if the glass on the exposed floor is shattered due to fire influence, causing flames to lick up the outside of the building. Falling glass can endanger pedestrians, firefighters and firehoses below. An example of this is the First Interstate Bank Fire in Los Angeles, California. The fire here leapfrogged up the tower by shattering the glass and then consuming the aluminium skeleton holding the glass. Aluminium's melting temperature is 660°C, whereas building fires can reach 1,100°C. The melting point of aluminium is typically reached within minutes of the start of a fire. Firestops for such building joints can be qualified to UL 2079 -- Tests for Fire Resistance of Building Joint Systems. Sprinklering of each floor has a profoundly positive effect on the fire safety of buildings with curtain walls. In the case of the aforementioned fire, it was specifically the activation of the newly installed sprinkler system, which halted the advance of the fire and allowed effective suppression. Had this not occurred, the tower would have collapsed onto fire crews and into an adjacent building, while on fire. Exceptionally sound cementitious spray fireproofing also helped to delay and ultimately to avoid the possible collapse of the building, due to having the structural steel skeleton of the building reach the critical temperature, as the post-mortem fire investigation report indicated. This fire proved the positive collective effect of both active fire protection (sprinklers) and passive fire protection (fireproofing). Image File history File links Metadata Size of this preview: 800 × 525 pixelsFull resolution‎ (2,000 × 1,312 pixels, file size: 607 KB, MIME type: image/jpeg) Incêndio no edifício-sede da Previdência Social(INSS) em Brasília, na manhã desta terça-feira. ... Image File history File links Metadata Size of this preview: 800 × 525 pixelsFull resolution‎ (2,000 × 1,312 pixels, file size: 607 KB, MIME type: image/jpeg) Incêndio no edifício-sede da Previdência Social(INSS) em Brasília, na manhã desta terça-feira. ... For other uses, see Fire (disambiguation). ... Old Executive Office Building, Washington D.C. Bank of China Tower, Hong Kong, China In architecture, construction, engineering and real estate development the word building may refer to one of the following: Any man-made structure used or intended for supporting or sheltering any use or continuous occupancy, or An... For other uses, see Steel (disambiguation). ... Aluminum redirects here. ... Image File history File links Size of this preview: 800 × 553 pixelsFull resolution‎ (3,417 × 2,360 pixels, file size: 644 KB, MIME type: image/jpeg) File historyClick on a date/time to view the file as it appeared at that time. ... Image File history File links Size of this preview: 800 × 553 pixelsFull resolution‎ (3,417 × 2,360 pixels, file size: 644 KB, MIME type: image/jpeg) File historyClick on a date/time to view the file as it appeared at that time. ... For other uses, see Polystyrene (disambiguation). ... Sheets of stainless steel cover the Chrysler Building Thin sheets of gold leaf Sheet metal is simply metal formed into thin and flat pieces. ... Firestop after fire exposure during fire test in Tulsa, Oklahoma. ... Perimeter slab edge building joint with incomplete firestop, between concrete floor and precast concrete facade. ... Mineral wool, means fibres made from minerals or metal oxides, be they synthetic or natural. ... Firestop after fire exposure during fire test in Tulsa, Oklahoma. ... Perimeter slab edge building joint with incomplete firestop, between concrete floor and precast concrete facade. ... International time/temperature curves used to run commercial furnaces for testing the Fire-resistance rating of passive fire protection systems, such as firestops, fire doors, wall and floor assemblies, etc. ... In structures, such as land-based buildings, traffic tunnels, ships, aerospace vehicles, or submarines, compartmentalization is the fundamental basis and aim of passive fire protection. ... Flag Seal Nickname: City of Angels Location Location within Los Angeles County in the state of California Coordinates , Government State County California Los Angeles County Mayor Antonio Villaraigosa (D) Geographical characteristics Area     City 1,290. ... This article is about the U.S. state. ... Aluminum redirects here. ... For other uses, see Fire (disambiguation). ... This article is about the complete system. ... Fireproofing, a passive fire protection measure, subject to bounding, refers to the act of making materials or structures more resistant to fire, or to those materials themselves. ... Structural steel is steel construction material, a profile, formed with a specific shape or cross section and certain standards of chemical composition and strength. ... Active fire protection is one of the three types of structural fire protection. ... Fire-resistance rated wall assembly with fire door, cable tray penetration and intumescent [1] cable coating. ...

Fireman knock-out glazing panels are often required for venting and emergency access from the exterior. Knock-out panels are generally fully tempered glass to allow full fracturing of the panel into small pieces and relatively safe removal from the opening. Architectural glass has been used in buildings since the 11th century. ...

Maintenance and repair

Curtain walls and perimeter sealants require maintenance to maximize service life. Perimeter sealants, properly designed and installed, have a typical service life of 10 to 15 years. Removal and replacement of perimeter sealants require meticulous surface preparation and proper detailing.

Aluminum frames are generally painted or anodized. Factory applied fluoropolymer thermoset coatings have good resistance to environmental degradation and require only periodic cleaning. Recoating with an air-dry fluoropolymer coating is possible but requires special surface preparation and is not as durable as the baked-on original coating. These inexpensive carabiners have an anodised aluminium surface that has been dyed and are made in many colors. ...

Anodized aluminum frames cannot be "re-anodized" in place, but can be cleaned and protected by proprietary clear coatings to improve appearance and durability.

Exposed glazing seals and gaskets require inspection and maintenance to minimize water penetration, and to limit exposure of frame seals and insulating glass seals to wetting.

See also

• Mullion wall

The Mullion Wall is a structural system in which the load of the floor slab is taken by prefabricated panels around the perimeter. ...

References

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External links

• Curtain walls in 20th-century architecture