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Construction Ecology | ARBE1102 | Phoi Nghi Nghiem | C3353037Assessment 4 | Decision MakingProject introductionThe Scenario that will be addressed is scenario A.“The developer, Simple Green Dwellings Pty Ltd, in Hobart, TAS, has had financial success redevelopingsingle-house properties into “environmentally-friendly” townhouses in Hobart. The developer does not really careabout the eco credentials of the building products but wants your team to provide an attractive list of buildingmaterials that appear to be eco and healthy, which will add to the sales pitch for the properties. Increasingly, the“green building” sales pitch is proving successful, with some buyers more aware of greenwashing than others, but allbuyers in this market typically wanting a better outcome for the environment and their own health.”The approach in apprehending the scenario will be providing a list of materials with low carbon energy emission thatare easily recycled, reused or disposal in order to align with the sustainability and green building vision that thedeveloper promotes.EVALUATION OF THIS PROJECTThis project investigates a material selection process by evaluating three options for one building element:The interior based material selection for this project will evaluating three relatively low embodied carbon materialswhich being Concrete blocks (1.5 per embodied energy MJ/kg), Gypsum board/Plasterboard (4.4 per embodiedenergy MJ/kg) and Stainless Steel (42 per embodied energy MJ/kg). (Australian Government YourHome, n.d.)Unique requirements for project – decision-making criteriaThe unique requirements in order to select material that satisfy both the developer client’s objective and promotingsustainability for the future of the construction are climate compatibility and low-cost materials that creates lowenvironmental impact. The selected materials are chosen based on the weathering conditions of Hobart during theentirety of the year. The climate of Hobart is quite stable compared to the rest of Australia, averaging around 15°C to16.8°C during warmer seasons such as spring and summer while averaging from 8°C to 13.7°C during colder seasonssuch as autumn and winter (Australian Government Bureau of Meteorology, 2020) . Due to the developer statingthey ‘does not care about eco-credentials requires a material list that appears to be eco and healthy and will add tothe sales pitches for the properties’, indicates that low-cost of materials and the incur cost of material transportationfee will be an imperative factor that comes into consideration. Hence, accessible local manufacturers are selected inacquiring the materials. Therefore, the low-cost and eco-friendly materials must be recyclable or reused in order tominimise possible environmental impact cause through construction.
Construction Ecology | ARBE1102 | Phoi Nghi Nghiem | C3353037Table 1 Unique location and client information for this projectLocal ClimateExisting Conditions forbuilding siteInterpretationInfluence on Material choiceTemp average/max January21.6°CTasmania is located southern ofAustralia at the latitude locatedbetween 40 – 43 degrees southlatitude, therefore thedomination of western currentsthroughout the year results to aseries of disturbances that willlead the wind to the west sideof the island.Hobart is located on thesoutheast of Tasmania andreceives 570 millimeters of rainper year. Since, the climate ofHobart is classified mildtemperate oceanic climatetherefore seasonal mild rainywinters and cool, yet quiterainy summers are to beexpected, rainfall are welldistributed over seasons evenduring summer.The climate zone determined inHobart is classified ‘Zone 7’.Zone 7 is characterised to haveCool temperate therefore thereis low humidity, high diurnalrange with four distinctseasons. The summer andwinter exceed human comfortrange with variable spring andautumn conditions, cold to verycold winters with majority ofrainfall, hot dry summers. Dueto these conditions, buildingdesigns should aim to maximisesolar gains to achieve thermalcomfort (AustralianGovernmentYourHome, n.d.)The climate in Hobart is quitecool with low humidity level,thus requires a substantialamount of energy to achievethermal comfort for humans.According to the NationwideHouse Energy Rating Scheme(NatHERS Rating), thedevelopment of houses in abenign climate needs toachieve 8 or more stars levelof thermal performance inorder to maintain thelifecycle of carbon reductionsequivalent to other climatezones. Therefore, thematerial selected arerequired to containappropriate thermalconductivity (AustralianGovernmentYourHome,n.d.).Av/Min July11.7°CProjected 2090max26°CProjected 2090min23°CWind Jan am10% – 20% of windfrom North Westgoing at 10 – 20km/h.Beaufort number:3 –4Wind Jan pm10% – 20% of windNorth West goingat 10 – 20 km/h.Beaufort number:3 –4Wind July am10% – 30% of windSouth East going at20 – 30 km/hBeaufort number:4Wind July pm10% – 20% of windfrom North Westgoing at 10 – 20km/h.Beaufort number:3 –4Climate ZoneZone 7: Cool TemperatureLocal Biome typeBiome type is categorisedas ‘Grassland’ and underthe sub-division of‘Savanna’Client requirementsThe Simple Green Dwellings PtyLtd strategies ‘Green building’as a marketing ploy to elevatetheir sales pitch to the moreenvironmentally wary targetedmarket audience. With theunderstanding the prospectWith the requirement of thedeveloper to create anattractive list of ‘eco andhealthy’ materials. The threematerials being proposedand evaluated are: concreteblocks, gypsum board and
Construction Ecology | ARBE1102 | Phoi Nghi Nghiem | C3353037buyers are conscious of ‘Greenbuilding’ are more beneficial forthe overall health of bothdwellers and the environment.Thus, the only requirement ofthe materials proposed todeveloper is the want of an‘attractive list of buildingmaterials that appears to beeco and healthy’. However,appearing to be ‘eco andhealthy’ is not adequate andlow embodied materials shouldbe proposed and promoted inorder satisfy potentialprospects who have done theirresearch on sustainable eco-friendly building materials. Itwill illustrate the company withwell-aware and educated imagethat the developer envisioned.stainless steel. All thematerials chosen to beproposed to the developerhas high levels of durabilityand sustainability therefore itreduces the impact on theenvironment. Theconstruction industryaccounts for 36% of theworldwide energy usage andemits 40% of Carbon Dioxideemission with fabrication andshipment of materialscontributing a great image tothe carbon emission. Thus,materials should be sourcedlocally to reducetransportation andrecyclable/reusable toreduce energy consumptionand wastage. Both gypsumboard (USG Boral, n.d.) andstainless steel(Stainless Steeland the Environment, 2019)are 100% recyclable whilstconcrete blocks are quitesustainable (USG Boral, n.d.).Locally manufacturedmaterialsUSG Boral is an internationalbuilding and constructionmaterials provider with amultitude of distributors acrossAustralasia. Their products arevery accessible with deliveryservice to buyers and has awide range of different size andcolours. Therefore, choosingUSG Boral for gypsum boardand concrete blocks. BluescopeSteel likewise to USG is also amajor company specialising insteel due the easy accessibility,delivery service and vast rangeof steel materials, therefore,sourcing stainless steel from adependable company is a wisechoice.USG Boral take the requestfor variation customisation ifcontacted by a ContractAdministrator. For example,a standard USG Gypsumboard stands at 2400mm talland the building space thatneeds to be filled is 2000mm,a Contract administrator cancontact the company can askthe order for it to be cut andsized down to 2000mm. Thiswill be beneficial for bothparties, as client’s requiredsize for material achieve andUSG gains a loyal customerthrough ease and customerservice.Summary of decision-making criteria:The climate in Hobart7 is characterised to havecool temperate and low humidity high diurnal range; therefore, coldto very cold winters with majority of rainfall, hot dry summers, exceeding the human comfortability range. Accordingto the Nationwide House Energy Rating Scheme (NatHERS Rating), the development of houses in a benign climateneeds to achieve 8 or more stars level of thermal performance in order to maintain the lifecycle of carbon reductionsequivalent to other climate zones. Therefore, the material selected are required a substantial amount of thermal
Construction Ecology | ARBE1102 | Phoi Nghi Nghiem | C3353037conductivity to achieve thermal comfort for humans and home building designs should aim to maximise solar gainsto achieve thermal comfort (Australian GovernmentYourHome, n.d.)The construction industry accounts for 36% of the worldwide energy usage and emits 40% of Carbon Dioxideemission with fabrication and shipment of materials contributing a great image to the carbon emission. Theproposed materials should be sourced locally to reduce transportation and recyclable/reusable to reduce energyconsumption and wastage. Both gypsum board (USG Boral, n.d.) and stainless steel(Stainless Steel and theEnvironment, 2019)are 100% recyclable whilst concrete blocks are quite sustainable (USG Boral, n.d.). This greatlybenefit the Simple Green Dwellings Pty Ltd by aligning with the company’s image and the minimising the cost ofmaterial sourcing and transportation whilst also utilising credible eco-friendly and sustainable materials. Thus, thethree requirements of the materials proposed to developer are:To Align with the want of ‘attractive list of building materials that appears to be eco and healthy’.Construction materials designed to be compatible with Hobart climate zone outlined by the AustralianGovernment.Be sustainable with low carbon embodied energy emissionAdditional decision-making factorsThe developer atSimple Green Dwellings Pty Ltd have create the image of being ‘Green building’ company as amarketing ploy to elevate their sales pitch to the more environmentally wary targeted market audience. Therefore, itis an imperative component, materials must be low carbon emission and eco-friendly sustainable materials that canbe recyclable or reused in order to minimise possible environmental impact cause through construction. With agrowing demographic of prospect buyers acknowledging the importance of ‘Green building’ are more beneficial forthe overall health of both dwellers and the environment.Decision-making framework: ideal outcome reference chartTable 2 Ideal outcome reference chartThemeDecision-makingfactorsIdeal options (low – high)FateRecycled contentO-9%10-29%30-49%50-69%70-89%90-100%