Engineered Wood Sustainability And Green Building Practices Slide Show

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  • Engineered Wood Products (EWP) have long been recognized as a resource efficient product. For example, when compared to traditional 2 x 12 framing, an 11 7/8 2x3 flanged I joist uses only 55% of the fiber and spans 22% further. This resource efficiency has been part of the EWP story from its inception. As the needs of the marketplace have evolved, the focus has changed and we are not only looking to capitalize on the resource efficiency of EWP, but also looking at how EWP can be utilized in the built environment to create energy efficient structures all the while keeping our commitment to sustaining and renewing the resources we make these products from….
  • During today’s discussion, I’d like to discuss some of the pertinent issues surrounding EWP, sustainability and green building practices. We’ve set forth 6 key learning objectives that we hope to accomplish by the end or our time together. (Read from slide) Green Building Programs discussion will include programs from NAHB, L.E.E.D for Homes, Minnesota Green Star, and the Wisconsin Green Built Home program.My Notes: (for deconstruction/reconstruction, bring different types of manufactured products: LSL, LVL, GL)
  • Here’s some other benefits of wood compared to other building materials.Wood ranks high in insulating and acoustic properties.Comparing thermal conductivity (k) between materials yields the following results:Fiberglass: .04Softwoods: .12Glass: 1.05Concrete: 1.7Carbon Steel: 54Aluminum: 250Wood: One inch is R1.25Concrete: 12.5 inches to achieve R1
  • Compares the overall energy costs embodied in (attached to) the use of product. The life cycle analysis measures a product’s complete lifecycle cost from extraction and manufacture through product utilization to recycling or re-use.The analysis allows designers to make environmentally responsible decisions when specifying products.The EcoCalculator, developed by the Athena Institute, is a Life Cycle Analysis software tool that assesses and allows for side-by-side comparison of the LCA of various building component combinations (wood vs steel studs, insulation, sheathing, etc).LCA looks at every aspect of a product’s useful life.
  • **Here’s another study found on the Athena Institute site.This study compares multiple aspects of environmental impact of wood, steel and concrete.Again, wood performs better in environmentally sensitive areas.

Transcript

  • 1. Engineered Wood, Sustainability and Green Building Practices Green Building Practices For Wood Frame Construction
  • 2. Learning Objectives After this session, you will be equipped to : Define and Discuss Sustainability Issues Compare construction materials for “green” compatibility Identify and select various Green Rating Tools Compare/contrast Green Building Programs Evaluate various EWP products based on the deconstruction/reconstruction principle Discuss EWP framing systems recognized as “green” by current Green Build programs.
  • 3. Energy FactsEnergy doesn’t grow on treesDecisions are now being made based on energy costs and sustainability
  • 4. A New Vocabulary Life CycleSustainability Renewability Costs Carbon Carbon EmbodiedSequestration Footprint Energy
  • 5. A New Vocabulary GreenBuilding LEED Building Green Standard Green Charrette Globes
  • 6. Components of Green Building Resource Efficiency Environmental Energy Impact Efficiency
  • 7. Renewable Resources? Wood Concrete SteelInsulating Value? Yes NO NO Renewable? Yes NO NOLow Energy Cost to Yes NO NO produce? Purifies the air? Yes NO NO Potentially Yes NO NOUnlimited Supply?
  • 8. Forestry FactsWood is renewable and sustainable Source: APA
  • 9. Wood is Good for the environmentUS Raw Material Production and Total Energy Used Source: APA
  • 10. Nature’s Air Purifier!A growing forest produces 1 ton of oxygen andabsorbs 1.4 tons of carbon for every ton of woodMature trees slow in their absorption rate of CO2Harvesting insures that the carbon is locked in thewood (Carbon Sequestration) .Decaying trees release stored carbon back into theatmosphereNew trees with rapid absorption rates can bereplanted to continue this air purification.Source: APA
  • 11. Benefits of Wood vs. Steel and Concrete high insulating and acoustic properties recycling and resource recovery rates low pollution rates in harvesting and millinghttp://www.engineeringtoolbox.com/thermal-conductivity-d_429.html
  • 12. Lifecycle Analysis Resource Extraction Disposal, Reuse Manufacturing or Recycling Building Onsite Demolition ConstructionSource: Buildinghttp://www.athenasmi.org/ Occupancy &about/lcaModel.html Maintenance
  • 13. Comparison of Materials 5 times 126 times 14 times 24 timesmore energy more energy more energy more energyto produce 1 to produce 1 to produce 1 to produce 1 ton of ton of ton of glass. ton of steel. cement · aluminum. Source: APA
  • 14. LCA Wood vs. Steel and Concrete CORRIM Study Results:Wood vs. Steel: 17% embodied energy savings with woodWood vs. Concrete: 16% embodied energy savings with wood www.CORRIM.org
  • 15. Lifecycle Analysis: the environmental proof of wood* Sustainability Attribute Wood Steel Concrete• Total Energy Use • Lowest • + 140% • +70%• Greenhouse Gases • Lowest • +45% • +81%• Air Pollution • Lowest • +42% • +67%• Water Pollution • Lowest • +1900% • +90%• Solid Waste • Lowest • +36% • +96%• Ecological Resource Use • Lowest • +16% • +97% Source: Athena Institute. http://www.athenasmi.org * Sullivan and Horwitz-Bennett, Using wood for sustainable design&construction
  • 16. Not all engineered products are created “green”-equal
  • 17. Green Building Programs- Who’s in the “LEED” National ProgramsUSGBC/L.E.E.D. Leadership in Energy and Environmental DesignNAHB/Green Building StandardGreen Building Initiative/Green Globes
  • 18. USGBC/L.E.E.D. for Homes Mission:Promote sustainable building Top 25% of Homes http://www.usgbc.org/ShowFile.aspx?DocumentID=3638 Best Environmental FeaturesPromote Green Residential BuildersPromote Green Commercial Building
  • 19. USGBC/L.E.E.D. Categories Location & SustainableInnovation Linkages Sites Water Energy & Material &Efficiency Atmosphere Resources Awareness Indoor Air and Quality Education
  • 20. USGBC/L.E.E.D. Platinum Gold Silver CertifiedPoints adjusted for larger/smaller homes
  • 21. USGBC/L.E.E.D. How to ParticipateJoinIdentify project team (Charrette)Build the homeCertifySellRepeat…
  • 22. NAHB Green Building ProgramHBA drivenOnline scoring toolBased on GB Guidelines document Foundation for HBA programsResidential ISO Standard -2008
  • 23. NAHB Green Building Program Lot Design, Resource Energy Preparation, Efficiency Efficiency Development Operation, Indoor Maintenance, Water Efficiency Environmental Homeowner Quality Education Global Impact
  • 24. NAHB Green Building Program Emerald Gold Silver Bronze
  • 25. NAHB Green Building Program Builder ParticipationCalculate your scoreForward to Green VerifierBuild and verify Green StatusCertify Home Test and InspectBuild again
  • 26. Green Building Initiative MissionAccelerate best building practicesGreen Globes (commercial construction)Integrates use of Athena EcoCalculatorANSI Standard for assessment of Commercial BuildingsPromotes NAHB program to HBA’s
  • 27. National Program SimilaritiesChecklist based3rd party verification requiredSimilar categories addressed: Resource efficiency Energy efficiencyFraming recommendation similar: Advanced Framing and O.V.E.Designed to create marketing opportunities
  • 28. National Program DifferencesNAHB program requires environmental management systems for manufacturer and builder- ISO 14001FSC the only forestry certification for LEED. (USGBC position under review) NAHB recognizes multiple certifications.LEED predominantly paper based, NAHB and Globes are web-based programs.
  • 29. Regional Green Building Programs Wisconsin Green Built Home http://wi-ei.org/greenbuilt/ New construction, remodeling, multifamily, waterfront programs Wisconsin Energy Star or REScheck +15 levels Based on points checklist Minimum 10% 3rd party verified
  • 30. Regional Green Building Programs Minnesota Green Star http://www.mngreenstar.org/ New construction and remodeling Certified, Silver, Gold levels Based on a points checklist All 3rd party verified
  • 31. The Big “3” for wood frame: Summary Categories Resource Efficiency Environmental Energy Impact Efficiency
  • 32. ResourceEfficiency Finding a Fit for Fiber: Determining Optimum Value is A Manufacturer’s Responsibility
  • 33. ResourceEfficiency The Principle: Best And Highest Use
  • 34. EnergyEfficiency Resource Efficient products used in an Energy Efficient Manner
  • 35. EnergyEfficiency Interplay between the wood frame system and the thermal envelope
  • 36. Environment Protect the environment as you conduct your business• NAHB Program requirement: “the product line, plant, or company must be ISO 14001 certified.”
  • 37. EWP Applications meeting GreenBuilding Guidelines- Resource Efficiency Life Cycle Assessment Tool Download EcoCalculator at: http://www.athenasmi.org/index.html
  • 38. EWP Applications meeting GreenBuilding Guidelines- Resource EfficiencyResource Efficiency Use OVE/Advanced Framing 4’ and 2 Modules Wider o/c Spacing More InsulationEliminate thermal bridgingSingle top plates2 stud corners with drywall clipsP.E.T.Construction layouts
  • 39. EWP Applications meeting GreenBuilding Guidelines-Resource EfficiencyResource Efficiency Applications- EWP Wide Flange I Joists 24 oc performance Framing layouts Panelize P.E.T.
  • 40. EWP Applications meeting GreenBuilding Guidelines- Energy Efficiency Energy Efficiency Requirements: Increase R Value in the building envelope Applications: Remove wood, decrease thermal bridging, increase insulation…..how? Use wide flange, heavy duty I joists at 24 oc., 1 ¾” wide face studs for walls. Stack roof framing over wall framing over floor framing in a 24” oc module. Use energy efficient materials when possible.
  • 41. Advanced Framing Techniques
  • 42. EWP Applications meeting Green Building Guidelines Environmental ImpactISO 14001 Environmental Management System Defined: An objectively verifiable declaration of your intended environmental management system.
  • 43. Summary WOODClearly superior building materialEWP provides optimum performance opportunitiesNot all Engineered Wood is created GREEN equal.
  • 44. Learning Objectives Did we???????? Define and Discuss Sustainability Issues Compare construction materials for “green” compatibility Identify and select various Green Rating Tools Compare/contrast Green Building Programs Evaluate various EWP products based on the deconstruction/reconstruction principle Discuss EWP framing systems recognized as “green” by current Green Build programs.
  • 45. Engineered Wood, Sustainability and Green Building Practices Green Building Practices For Wood Frame Construction