The% pavilion% of% union% house%is%supported%by% columns%on%the%edges% learning loop;! a n d% c a b l e s% t h a t% Metals: Metals are malleable, ductile and non-brittle. There are two kinds of metals: ferrous (iron, common can cheap) and non-ferrous (all other the%! roof% in% metals, have different qualities). Because of the nature of metals, they can be shaped intostabilise% many shapes. Prevent metals from corrosion and oxidation: metals can be separated by insulator suchwindy% as rubber gasket or kept weather.% This%away from sitting in moisture. For oxidation, it is not always damages: Aluminium oxidate to form a layer protecting the metalopening% from corrosion. Rusty steel is an example of undesired is% the% lowest% oxidation that it saves water and moist air within the structure to form further corrosion. For avoiding corrosion, 1) avoid crevices and creating flat point% treatment—galvanised of% the% roof% horizontal surfaces; 2) enamel or paint metal surface—seal the surface from moisture. 3) chemical steel. ! which% enables% rain% Ferrous Metals: very reactive chemically, they are easily corrodes through rusting. Good compressive strength. Usually used 1) wrought iron— iron water%to%drainage%and% heated and hammered into desired shapes. Used in windows and door bars and decorations. 2) Cast iron— iron melted and pored into moulds. p r e v e n A n g % t h e% brittle, requires reinforcement. columns. 3) steel— alloy of iron and carbon. They are strong and resistant to fracture. Can be formed into many columns% from% over% different shapes. ! load.% Cable% around% Non-ferrous metals: 1) Aluminium—structural capabilities. 2) Copper—used as roofing materials or for hotis% and cold domestic water and heating this% opening% loose% pipework or electrical cabling. 3) Zinc—layer of zinc on iron can help to protect them from rusting. 4) Bronze: bearing, in% normal% days% and% in% clips, springs or electrical connectors. 5) Brass— screws, valves. ! tension%in%windy%days.% hot rolled ! structural steel: 1) hot rolled (parallel flange channel in OP): shaped when the metal is% still hot. usually used as tension
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primary structural elements of a building, and often protected by coating. Joints between hot rolled structural steel are bolted or welded. 2) cold formed: folded from sheers that have been previously produced and cooled down. Usually more expensive than hot rolled steel. Usually protected by galvanisation. Joints between are bolted or screwed. ! This% column% funcAons%
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Roof system: 1) flat roof: 1—3 degrees, there is no “flat” roof because then they won’t be able to drainage water. 2) bearing% the% load% of% pitched roofs—bigger than 3 degrees. Tile roof should be bigger than 15 degrees.
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Glossary:! ! Tile roofing: Tile roofing consists of clay or concrete units that overlapping or interlocking each other to create a strong textural pattern (Ching, 2008, p.7.08). !
! Rafter: one of a series of sloping parallel beams used to support a roof covering.! ! Hip: The inclined projecting angle formed by the junction of two adjacent sloping sides of a roof (Ching, 2008. p.6.16).! ! Valley: an intersection of two inclined roof surfaces toward which rainwater flows (Ching, 2008. p.6.16).! ! Ridge: the horizontal line of intersection at the top between two sloping planes of a roof (Ching, 2008. p.6.16).! ! Eave: the overhanging lower edge of a roof (Ching, 2008. p.6.16).! ! purlin: One of the several horizontal structural members that support roof loads and transfer them to roof beams.! ! Alloy: is a mixture or solid solution composed of a metal and another element.! ! soffit: The underside of a part or member of a structure, such as a beam, stairway or arch. ! ! portal frame: are generally low-rise structures, comprising columns and horizontal or pitched rafters, connected by moment-resisting connections. ! ! top chord: The top beams in a truss are called top chords and are generally in compression.  
Reference list:! "Tile Roof in Louisville, KY | Commonwealth Roofing." Commonwealth Roofing. N.p., n.d. Web. 10 Sept. 2014. <http:// www.commonwealthroofing.com/tile-roof/>.