Alternative Construction Research Guide - GCCDS

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8.3 | Metal RoofsBecause the screws are visible, the pattern of attachmentshould be considered. Rake caps and ridge caps are installedafter the panels are in place.To prevent corrosion, screws and other fasteners shouldbe of the same metal as the roofing material. All exposedscrews need some form of gasket or rubber ring to preventleaks.Speed of <strong>Construction</strong>: Panels on a small roof can beinstalled in a single day.Delivery Method: Roofing supply companies will deliverpackages with the panels, flashing, roll underlayment,and screws directly to the building site. Any purlins can bedelivered from a lumber yard.Required Equipment: If using standing seam panels,a specialized crimper should be used. No special equipmentis needed for overlapping R-profile panels.Specialized Labor: Standing seam roofs require professionalinstallation. Architectural panels can be installedaccording to manufacturers’ specifications without aprofessional, but extreme care should be taken and experiencedinstallers are recommended.PERFORMANCEWind Load: Sheet metal roofs are a smart choice inhurricane zones because their larger unit size and weightmake them more resistive to uplift from heavy winds thansmaller and lighter shingle systems.Water Resistance: Metal roofs have fewer joints thanshingles and are less prone to leaking when properlyinstalled.Energy/Thermal: Light colored and galvanized finishmetal reflects light and heat, and thus is a smart choice forsunny coastal areas. Cooling costs are much lower withgalvanized sheet metal roofs than with asphalt shingles.Life Span: Most quality aluminum or galvalume coatedmetal panels will easily last 30 years, and some are marketedwith a 50-year life span. Zinc or galvanized steelcoatings can oxidize quickly in wet climates and thereforehave a shorter life span.Common Failure: Gaskets on roofing screws canbecome brittle over time, and may begin to leak. Lowqualitymetal will begin to rust over time 11 .(Fig.14) Metal roofs should be installed on 1x4 purlins and overlapped according to manufacturer’s specifications.
DESIGNMetal Roofs | 8.3Environmental Impact: Unlike asphalt shingles,metal roofs have a high recycled content. They are alsocompletely recyclable.In addition, lighter colored and galvanized roof finishesreflect sun and heat away from the house. Less energy isrequired for mechanical cooling systems, leading to lowerenergy bills for the homeowner.Versatility/Flexibility: Metal panels are larger thanshingles and should arrive on site pre-cut. Unusual orcomplicated roof profiles may be difficult to roof withmetal panels. Metal roofs are appropriate for a wide rangeof slopes.Market Exposure: Metal roofs are a traditional choicefor the Gulf Coast region, and many historic or vernacularhouses feature them.Code Approval: Metal roofs are generally acceptedby building code officials. In historic districts in the GulfCoast region, they are encouraged over asphalt shingles.Affordability: Metal roofs are becoming more affordablein the Gulf Coast region. A galvanized steel 26-gaugeroof is generally no more than 150% the cost of a baselineasphalt shingle, and comparable in price to a higher qualityor wind-resistant shingle. In addition, the material’slonger life span will save the homeowner repeated installationcosts over the life of the house, and its solar reflectivitywill save the homeowner on monthly cooling bills.Standing seam roofs are more expensive than corrugatedpanel roofs, and are more costly to install. However, theyhave an even longer life span.Coastal Considerations: Metal roofs are a goodchoice for the Gulf Coast region. They reflect heat awayfrom the house, lowering cooling bills. They withstandhigh winds well. They last much longer than asphaltshingles, and they are installed quickly.(Fig.14) A variety of profiles and colors is available for sheet metalroofs.GULF COAST AVAILABILITY /LOCAL MANUFACTURERSMetal roofs are available throughout the Gulf Coast. Thelocal workforce has a great deal of experience installingmetal roofs. Most metal roofing types can be orderedfrom construction supply stores. Specialty types shouldbe ordered in advance. Most metal roofs are shippedthroughout the United States, but there are plenty of localmanufacturers on the coast.(Fig.15) Standing seam metal roofs are less common and more expensive,but have a longer life span.
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The Gulf Coast Community Design Stu
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factoryassembledhomesconstructionpr
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Required Equipment: A crane and lif
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Component Homes | 1.2Component Home
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DESIGNComponent Homes | 1.2Environm
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PERFORMANCEWind Load: Kits can be d
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stall whatever the factory assemble
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panelsconstructionprocessspeeddeliv
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2.1 | Wood SIPsWood SIPsOverview: S
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2.1 | Wood SIPsLife Span: The OSB a
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2.1 | Wood SIPsMM & I Construction
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2.2 | Non-Wood SIPsand full constru
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2.2 | Non-Wood SIPssome information
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2.3 | Framed PanelsThe strength of
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Stacked Unit SystemsStacked unit sy
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3STACKED UNIT SYSTEMSsubjects3.1 In
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should be done carefully, as the co
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Concrete Masonry Units (CMU) | 3.2C
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Concrete Masonry Units (CMU) | 3.2D
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AAC is naturally resistant to termi
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Framing SystemsFraming systems are
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4FRAMING SYSTEMSsubjects4.1 Convent
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which allows for expedient construc
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Advanced Wood Framing | 4.2Advanced
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esidential building codes but may n
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ut can be designed to carry increas
Page 63 and 64: Water Resistance: Steel studs are t
Page 65 and 66: Engineered Floor Trusses | 4.5Engin
Page 67 and 68: Versatility / Flexibility: Engineer
Page 69 and 70: equired, construction crews should
Page 72 and 73: Chapter 5, Elevated Foundations, is
Page 74 and 75: floorsconstructionprocessspeeddeliv
Page 76 and 77: 6.1 | 2x6 Tongue and Groove Decking
Page 78 and 79: 6.2 | Suspended Cast-in-Place Decks
Page 80 and 81: 6.2 | Suspended Cast-in-Place Decks
Page 82 and 83: 6.3 | Floor FinishesSpeed of Constr
Page 84 and 85: 6.3 | Floor FinishesGULF COAST AVAI
Page 86 and 87: insulationrequiredequipmentthermalp
Page 88 and 89: 7.1 | Exterior FinishesExterior Fin
Page 90 and 91: 7.1 | Exterior FinishesEnergy / The
Page 92 and 93: 7 .2 | SheathingSheathingOverview:
Page 94 and 95: 7 .2 | SheathingMarket Exposure: OS
Page 96 and 97: 7.3 | InsulationAfter the foam drie
Page 98 and 99: 7.3 | InsulationInstallation: Miner
Page 100 and 101: 7.4 | Interior Finishesthe job and
Page 102 and 103: 7.4 | Interior FinishesWOOD & WOOD
Page 104 and 105: 7.4 | Interior FinishesMASONRYStone
Page 106 and 107: oofsconstructionprocessspeeddeliver
Page 108 and 109: 8.1 | Radiant BarriersRoofRadiant b
Page 110 and 111: 8.1 | Radiant Barrierssometimes rea
Page 112 and 113: 8.2 | ShinglesEnergy/Thermal: Aspha
Page 116 and 117: 8.4 | Tile RoofsPERFORMANCETile Roo
Page 118 and 119: 8.5 | Rubber RoofsINSTALLATIONRubbe
Page 120 and 121: 8.5 | Rubber RoofsDESIGNEnvironment
Page 122 and 123: App. I | Insuring HomesI. Insuring
Page 124 and 125: App. II | Energy Efficiency in Home
Page 126 and 127: App. II | Energy Efficiency in Home
Page 128 and 129: App. III | Site WorkIII. Site WorkT
Page 130 and 131: App. IV | Further ResearchIV. Furth
Page 132 and 133: App. V | GlossaryCompression: Physi
Page 134 and 135: App. V | GlossaryShear Wall: Walls
Page 136 and 137: App. VI | EndnotesChapter 3: Cast a
Page 138 and 139: App. VI | Endnotes2. “HardiePlank
Page 140 and 141: App. VII | Images UsedFig.8Fig.9Fig
Page 142 and 143: App. VII | Images UsedFig.16Fig.17I
Page 144 and 145: App. VII | Images UsedFig.2Fig.3Fig
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Alternative Construction Research Guide - GCCDS

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