Greg Johnson on National Green Building Standard


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Greg Johnson on National Green Building Standard

  1. 1. ICC/NAHB-700 An Introduction to ICC 700-2008 The National Green Building Standard
  2. 2. Introduction  The standard addresses the huge impact that construction and maintenance of buildings have on the environment. According to the USGBC, buildings in the US account for:  39% of annual energy use,  65% of waste output and  12% of water use. 2
  3. 3. NGBS Historical Perspective  In 2005, NAHB released their Green Model Home Building Guidelines, a green building rating system.  The International Code Council was a stakeholder in the process that created the guidelines.  The guidelines were used as the basis for the Working Draft of the NGBS.  NAHB currently uses the guidelines as the basis for its National Green Building Program (but intends to base it on the NGBS after ANSI approval). 3
  4. 4. Scope, Intent, and Applicability  The standard rates residential buildings with respect to their potential environmental impact. It includes four threshold levels to encourage the construction of higher performing green buildings.  Bronze  Silver  Gold  Emerald 4
  5. 5. Table 304 5
  6. 6. Scope, Intent, and Applicability  The NGBS is intended to rate the environmental impact of low-rise, mid-rise, high-rise, mixed use, single-family and multi- family residential buildings.  The standard also rates green renovations and additions, as well as green sites and subdivisions. 6
  7. 7. Scope, Intent, and Applicability A Major distinguishing feature of the NGBS is its application to existing residential buildings.  Existing structures make up 90% of housing  Existing buildings are not addressed by most current residential green building programs.  Renovations and additions are specifically addressed and rated by the NGBS. 7
  8. 8. Table 306: Green Remodels 8
  9. 9. Table 303: Site Design & Development 9
  10. 10. The ANSI Process: Balanced and Diverse Interests  Balanced and diverse interests helped the Consensus Committee ensure  Affordability  Enforceability  Ease of implementation  Manufacturer and Builder Committee Members  Helped keep a perspective on potential costs and ease of implementation. 10
  11. 11. Why do Affordability, Enforceability, and Ease of Implementation Matter?  Affordable and easily implemented green features  Are more likely to be maintained  Enforceability  Allows local building departments to double as environmental stewards  Can be administered locally, unlike most other green programs  May be more cost effective than remotely administered programs 11
  12. 12. Can Green Be Affordable?  Green is becoming mainstream  The cost of going green is coming down  Some green features are affordable  Some green features are cost prohibitive  The standard is filled with choices  Conservation principles typically translate to cost savings  If we implement material resource conservation, this can result in less materials and less cost in the short term.  Whenever monthly energy costs are reduced by more than the increase in the monthly financing costs due to green features, the owner wins immediately, as well as in the long run. 12
  13. 13. We have building codes. Why do we need green building programs? Traditionally, building codes and standards have addressed how the environment affects buildings. The NGBS addresses the other half of the equation: how buildings affect the environment. 13
  14. 14. We have building codes. Why do we need green building programs? Building Codes  Neutral on Environmental Impact NGBS  Rates the potential environmental impact of each provision  Another layer of criteria code officials and designers must consider International Energy Conservation Code  Addresses conservation principles, as does the International Energy Conservation Code - which is why GB energy provisions are a likely candidate for future incorporation in the IECC. 14
  15. 15. The NGBS and the I-Codes The NGBS interacts with provisions contained in:  The International Energy Conservation Code (IECC)  The International Residential Code (IRC)  The International Building Code (IBC)  The International Plumbing Code (IPC)  The International Mechanical Code (IMC) Application of the NGBS requires expertise in many disciplines. The existing I-Codes often contain the detailed requirements for green features (such as structural and gray water provisions) The NGBS rates these features and encourages their implementation based on a conscious effort to reduce the negative impact of buildings on the environment. 15
  16. 16. GB and Code Requirements 16
  17. 17. Choice vs. Mandatory Requirements  The NGBS has minimum point threshold requirements in each environmental category.  Designers, builders and owners can choose from a multitude of provisions with which to comply, each with corresponding point values.  Very few mandatory requirements.  Mandatory requirements often eliminate design options.  Because point thresholds must be achieved, environmental responsibility is not compromised. 17
  18. 18. Administration of the NGBS The standard allows administration by any Adopting Entity, defined as: “The governmental jurisdiction, green building program, or any other third party compliance assurance body that adopts this Standard, and is responsible for implementation and administration of the practices herein.” 18
  19. 19. Administration of the NGBS Potential Adopting Entities:  Governmental Jurisdictions  Local or National Green Building Programs  Independent Third Parties 19
  20. 20. Choice vs. Mandatory Requirements and Governmental Jurisdictions  Where adopted by a jurisdiction, should the NGBS as a whole be administered on a mandatory or voluntary basis?  The jurisdiction makes this decision by nature of its adoption  AHJ decisions: administered in house or by third parties?  Plan review?  Inspections?  Third party involvement for specific verifications only? (such as energy related evaluations and/or testing)  Incentives to builders/owners?  GB assistance or education by AHJ? (Alternative materials and methods) 20
  21. 21. The NGBS as a Rating Tool The NGBS rates potential environmental impact in accordance with principles related to  Land Conservation  Water Conservation  Material Resource Conservation  Energy conservation  Indoor and outdoor air quality. Promotes owner education regarding Green Building  Operation  Maintenance 21
  22. 22. The NGBS as a Rating Tool Multiple Threshold Levels Promote High Performance Buildings  Bronze  Silver  Gold  Emerald Each Threshold Level has separate point requirements for  Land  Water  Material Resources  Energy  Indoor Air Quality  Owner Education 22
  23. 23. Table 304 23
  24. 24. Energy and Green Building  Energy is often considered the most important criteria in Green Building rating systems and standards.  Energy performance directly impacts:  Building carbon dioxide emissions,  Fossil fuel use and  Operating costs.  Energy is not a one time cost or factor.  Energy use occurs continuously over the entire life span of buildings.  The ultimate energy goal of green building:  Net-Zero energy buildings (buildings that use renewable energy sources to produce at least as much energy as they consume) 24
  25. 25. Putting NGBS Energy in Perspective: Software Analysis Option BRONZE Requires a minimum energy efficiency increase of 15% and awards 30 points in the Energy category (over 2006 IRC/IECC). SILVER Requires a minimum energy efficiency increase of 30% and awards 60 points in the Energy category. GOLD Requires a minimum energy efficiency increase of 50% and awards 100 points in the Energy category. EMERALD Requires a minimum energy efficiency increase of 60% and awards 120 points in the Energy category. 25
  26. 26. Common GB Misconceptions  Green Building and “Alternative” Construction  Misconception: Green buildings are typically buildings which utilize “alternative” construction methods.  Reality: Though some green buildings use “alternative” construction methods, the overwhelming majority are higher performance buildings of conventional construction  The Codes and Green Building  Misconception: If a green feature is awarded points in a green building rating system, it is no longer required to comply with code related criteria.  Reality: Green features not excused from compliance with applicable code provisions. (This is the most common reason codes are incorrectly cited as “barriers” to GB.) 26
  27. 27. The NGBS Encourages the Following:  Erosion and sedimentation control and storm water management  Development of brownfield and greyfield sites  Building in close proximity to public and/or alternative transportation  Avoiding environmentally sensitive areas  Landscape design which limits long term water and energy use and preserves the natural environment 27
  28. 28. The NGBS Encourages the Following:  Reducing heat island effects  Implementing rainwater collection and gray water recycling systems  Limited use of irrigation systems or efficient irrigation systems  Using waterless urinals and low-flow/consumption water closets (toilets), faucets and shower heads 28
  29. 29. The NGBS Encourages the Following:  Building smaller structures to reduce site impact, material resources and energy use  Building up instead of out to produce a smaller footprint  Using durable, affordable and low maintenance materials  Using materials which are easily returned to the earth  Recycling construction and post construction waste 29
  30. 30. The NGBS Encourages the Following:  Building high performance/energy efficient building envelopes  Using energy efficient luminaries, appliances, and heating and cooling systems  Sealing ducts, building envelopes, including weather stripping and added insulation  Using whole house ventilation and ceiling fans  Using low VOC and emitting materials  Installing MERV air filters 30
  31. 31. ICC/NAHB-700 To view Draft Standard #2 of the ICC700-2008 National Green Building Standard, visit : 31