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Lesson 21 - Lassa” 21 Chapter21 Cladding with Metal and...

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Unformatted text preview: Lassa” 21 Chapter21 - Cladding with Metal and Glass BCN 1 001 BUItdl ”9 GangtrUfilon This chapter Introduces the student to the exotic. at first ' Cladding with Metal and Glass inexplicable details of aluminum and glass cladding _ Chapter 21 An initial seclien on aluminum extrusions and finishes sets the stage for presentation of two cladding systems ' P95 339 ' 3'5? — outside glaze-cl — Inside glazed The outside glazed system is easily understood The inside glazed system is somewhat more complex The slope glazing system with its ingenious i'Iten'lal drain age features rounds out 111 a chapter Aluminum Extrusions Features of Aluminum Extrusions - Aluminum Isthe metal most Htgl preelsion frequanlty used in mfltfll- oflhe extrusion process and—glass cladding systems Wrmlits clues-tolerance — Aluminum is sell-protesting diet-BI s againsl. corrosion . _ LIQhIWEIQfl'I. Easy Assembly: — It accepts and holds a Wide . ' — Snap-in glacial; beads variety o‘fsurface finishes _:_ — Snap-en 'T'lJliUl'l W'I'ETS — It can be Fabricated economically It'll!) Ir'lll'lllall} shapes by extrusion . Screw slots — 5c relll.I slots allow screws to be driven perpendicular to ' BBEflUB-E aluminum has a . . I I let: long axis of an high coefficient of thermal ruslon expansion _ -- - Screw ports — P'l'm'lslorls fer expats-Ion and _ Si: new ports. HE extruded emacmn head to be made eyl'ndrical features that allow a screw to be driven Doturrn-cotrer-atdspsrldrel or: Steel - .'—__ parslel to the long .ano's of Blue CrossI'Ellue Slflld. carnage |L ' an etdanton Features of Aluminum Extrusions Features of Aluminum Extrusions Thermal Breaks Thermal Elrealca - Minimize heat tron srnlssloa'l t. A low thermal cone-cilia material — Ruber er Ella'EtIE 93550215 [polyurethane] is poured 'l'lte a special pec ket — Mastic strips . . it the aluminum emeien. This hardens te _ Plastic clip-s [mm a siren h ' ' . g. ard. hlgh densrty. durable — Cast and clebndged thermefl - the | air break tneld slide} The underside oflhe pocke’rcorltsirling the connected aluminum wall is them removed leaving the hardened lomeonductiue pohrurethsne as the onhr bond baht-lean the outside and [side walls orthc trams mcl'rltocr Heat and cold transnissicln is virtual; stopped atthis point. This polyurethane it no way adore-rash.I altects lhe strLlctural integrity oftha aluminum exthsiert Surface Finishes - Aluminum. protects itselfwith a thin. tenacious oxide film Bissau-sum further deflation Chalicy er seedy appearance - Anemzing Eleetrolytk: process that Forms a very lit-cl: tilde layer InIilili Integral color very aurwe Can [alt-e main].I eolore hid generally medical far very brighteoins. - Fluorapolymer coeungs — Mes]. widely used olthe organi: eeat'mgs — Extep-limally reshtant lo- alliorms ofweathering Including unravidet [imam ADM hi" SW35" ermller in ether nine arthreecnats Ava-table In new": linlsnes and every cum Modes of Assembly flint systems . Metal mulliorns - Rectangula' panels — Glass — Seandrel netenal - Advantages — Lew shipping built — Ability Leadjust to unforeseen site cendiionrs - Disadvantages — Must be assembled on site - Va-Iaenecorumns - Notified Loorng - Himaruegerms Undead-median system . Seldom used today . Midde ground between the stick and unit systems Surface Finishes - Powder coating Widely used on aluminum shelling eterlponellla Eleelricellv charged Ina-firming ponders Sprayed 'ont'o grounded aluminur‘n oornptmenl Halted it an even, Iwhere the powder filses Durable Wide mugs of I: olors end firishes Freedom from erganil: scheme that :ause air pollution - Medll'led acrylic or polyester polymers Very high gasses Ill'll'ide selection of colors - F'oty'dnyl Chloride coatings — heeled in very heavy films I Prevaleentealmt HWMEMMHEM EDl'I'l'B-ifll'l Modes of Assembly Unit system . Factory assembled units - Advantages — Minimizes on-sibe lab-3r - Disadvantages - Require more space during shinning — More prolecnon from change during shinning Modes of Assembly Panel system - l-lu'negenws units fumed from metal sheet Advantages — Minimizes on-sibe latter Disadvantages — Require more space during SMFIinQ — More protection from damage dln'ing shinning — Higher tooling costs Advantageous only for a building requiring a. large number or ldentlcfl panels Modes of Assembly Outside/inside Glazed Curtain Wall Column-cover-and-spandrel _ . An outsideglazed system - Advantages - ' _ - Less expensive to buy — Emphasizes the structural __ . _ ‘-' - Suitable for a building not more than three stories in module of the building , height ' Disadvantages - _ I ~. .. -- An inside-glazed system — Custom design must be .' , . . . . . created far each project - .\ _ ' - Used for taller bwldlngs because it ellmlnates the — Special care required in ' 5 ' - ' . need for scafidding detailing the spandrel panel - ' Glass may be replaced on the inside support to ensure that the panels do not deflect when loads are applied to the spandrel beams otthe building frame The Rainscreen Principle Systems are installed as Barrier systems Expansion Joints - The coefficient of then'nal expansion for glass is less than Designed to work as Rainscreen if a gasket should leak half as high as the coefficient Interior gaskets act as air barriers for aluminum. Intem-al c-awtles of the mulllons act as pressure . Rubber blocks equal lzatlon chambers Weep holes both pressurize the cavities and act to drain the leakage to the outdoors — Prevent the glass from “walking" too far in either direction during repeated cycles of heating and cooling - Telescoping joints — Regular intervals in the vertical are: r-m“ Maud mulllons ”liar-um; — Absorb vertical thermal movement ‘ — Cutting horizontal aluminum _ _ .. M_W components slightly shon by a - mags-:57“ calculated fraction m“ P“ _ find was - Accommodate horizontal then'nal movement Slope Glazing Slope Glazing Glass roofs over Include an internal lobbies, restaurants, drainage system swimming pools, etc — Collects any water that results from leakage or Problems with __ _ condensation and drains potential water ' - -- '-; rtto the outdoors leakage ' - Sloped rather than flat — Impossible to neutralize the force of gravity on a surface that is not vertical Moisture that condenses on the interior surfaces of the glass is likely to accumulate and drip To assist in keeping water from ponding on the roof Causes condensate to run to the lower edge of each light of glass before dripping off Moves waterthrough the drainage channels to the weep holes through which it is conducted back to the outdoors Dual-Layered Glass Cladding Two glass stuns separated by air-space [:31 personnel td well: though Outside sltin is usually comentiona] doubts-glazed cLItei'I well lunel skin is usually single glazed Airspace — halides amidst heal Ices — hwflfi agelnrsrttrensmleslen dream-e — muses sunshedcs or daylight reflectors — field at: a "chimney" for cmvecthe 1lleetiaticcl. or plerurn cmdiliceed air Advantages — Reduced heemg and coding 01:615- — harassed manna cur-iron — outer-r hte'lcr emrmnmem Dussmsritages — 5 ID1|J|JEIIEI1IEIEBI HES [OTHE I'III'HI'E'E IIITTI'IE IIIIJIIZIII'IQ — THEE- EIEI I'I'ILIEH #355 l'l1LlEt DIE'I151fllEd — Tm 33 rmch WE SUITECE I'l'IIIJSI he WHMW a regulatmis — Mr distributed mmum me armada s SJJDIBCI tolligh solar neat gains Curtain Well Design: The Process Con: eptual drawings prepared hythe architect and cladding consultant Manufacturer prepares detailed set at drawings Checked carefully by the are hltect. engineer. and cladding consultant Full-scale testlng cat-are authuriaatlcn 1c hegln Curtain Wall Design: The Process . For many buildings, the architect adopts a proprietary system that meets the design requirements Primary burden of responsibitl; on the manuteeturer and inslel-er of the system 1. When an architect sets out to design a rim-rr system of metal cladding other professlcn ah are heught Into the pree E55 _ An independent cladding emul‘lm een ['th a large trad}- of expenenee end emeriise to Ihis eftort and minimise the risk to the seeiiiiecl The struclual engineer attire building is heralded at least to the extent of understanding the Ilireiigl'rt and st'iaehment requirements ofthe system A curtain wall manufacu-er is also brought inld the design team Efl'i'gl' in the grease mdeetands lien'anulachn‘hg. asserting. iretallat'm. ald cost Assignment Page 38? Review Questions 1, 3, 5, E. ? If you do not understand a question. email me at temflthehecsdu dr through myPHCCedu ...
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