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RBES and CBES Updates - Better Buildings by Design Conference

This presentation at the Better Buildings by Design Conference discusses the updates to the Residential Building Energy Standards (RBES) and Commercial Building Energy Standards (CBES) in Vermont. The agenda includes an overview of the legislative history, update processes, and major changes to the codes. Participants will gain a better understanding of the current energy codes and the challenges related to implementation and enforcement.

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RBES and CBES Updates - Better Buildings by Design Conference

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  1. Residential Building Energy Standards (RBES) and Commercial Building Energy Standards (CBES) Updates Better Buildings by Design Conference - February 10, 2011 Navigant Consulting, Inc. (Consultants to Vermont DPS)

  2. Efficiency Vermont is a Registered Provider with The American Institute of Architects Continuing Education Systems (AIA/CES). Credit(s) earned on completion of this program will be reported to AIA/CES for AIA members. Certificates of Completion for both AIA members and non-AIA members are available upon request.This program is registered with AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.

  3. Learning Objectives At the end of this program, participants will be able to: • Gain a better understanding of the current VT residential and commercial energy codes • Understand challenges and issues related to implementation and enforcement of the energy code • Understand the overall process involved in current and future Vermont energy code updates

  4. Course Evaluations In order to maintain high-quality learning experiences, please access the evaluation for this course by logging into CES Discovery and clicking on the Course Evaluation link on the left side of the page.

  5. Agenda • Background and legislative history • Stu Slote • Residential Building Energy Standards (RBES) • Lee Wood • Q & A • Commercial Building Energy Standards (CBES) • Tim Guiterman • Q & A

  6. RBES Update Process Code Update Process • Last Update: 2003 VT RBES • ARRA Requirements: 2009 IECC • May 27, 2009 - legislature adopted Act 45 • Stakeholder meetings held to gather feedback • Advisory Committee meetings • DPS filed rule with ICAR (Interagency Committee on Administrative Rules) • DPS held public hearing • LCAR to conduct hearing and vote on rule • Rule to be adopted 15 days after filed • RBES handbook update

  7. CBES Update Process • Last Update: 2005 VT CBES • ARRA Requirements: 2009 IECC or ASHRAE 90.1-2007 • Technical Advisory Panel (TAP) • Meetings in June and July of 2010 • Highlighted areas for improvement • Included changes from current 2012 IECC / ASHRAE 90.1-2010 update processes

  8. CBES Update Process Overall direction for CBES Update • Meet minimum 2009 IECC / ASHRAE 90.1-2007 • Add VT-specific amendments and improvements • Consider substantial changes to create 2012 IECC / ASHRAE 90.1-2010 • New VT CBES codebook (VT-specific version of IECC) • Continue to maintain reference to ASHRAE 90.1 standard and allow that as approved compliance path • Public hearing on proposed rule held Jan 27 • Public comment period ended February 4 • LCAR to conduct hearing and vote on rule • Rule to be adopted 15 days after filed

  9. CBES Update Process Where are Commercial Codes Headed? Source: NEEP Building Energy Codes Policy 3/1/2009

  10. RESIDENTIAL Building energy standards (RBES)

  11. Table of Contents 1 Section 1: RBES Administration 2 Section 2: Major Changes to RBES

  12. Section 1 » RBES Administration Filing process to remain unchanged

  13. Section 1 » RBES Administration

  14. Section 1 » RBES Administration

  15. Section 1 » RBES Administration

  16. Section 1 » RBES Administration RBES Compliance Paths Start Mandatory Requirements Performance Approach Prescriptive Approach Either R-Values Table 402.1.1 Total UA Alternative 402.1.4 REScheck U-Factor Alternative Table 402.1.3 HERS Rating

  17. Table of Contents 1 Section 1: RBES Administration 2 Section 2: Major Changes to RBES

  18. Section 2 » Major Changes to RBES

  19. Building Envelope Section 2 » Major Changes to RBES Source: US DOE

  20. Building Envelope Section 2 » Major Changes to RBES Source: DOE

  21. Building Envelope Section 2 » Major Changes to RBES Source: Building Science Corp

  22. Building Envelope Section 2 » Major Changes to RBES Source: Building Energy Codes Program

  23. Fenestration Section 2 » Major Changes to RBES Notes Area-weighted averages 15 ft2 of glazing exempt One opaque door exempt

  24. Section 2 » Major Changes to RBES Air Leakage Source: RBES Handbook

  25. Section 2 » Major Changes to RBES Spillage Testing Source: Saturn Resource Management

  26. Section 2 » Major Changes to RBES Temperature Controls Lighting

  27. Section 2 » Major Changes to RBES Ducts * Unless located within conditioned space

  28. Section 2 » Major Changes to RBES Mechanical Ventilation

  29. Section 2 » Major Changes to RBES Domestic Hot Water Source: Saturn Resource Management

  30. Section 2 » Major Changes to RBES Other Requirements

  31. Log Homes Section 2 » Major Changes to RBES Log walls must comply with ICC400 with average minimum wall thickness of 5” or greater, and have heating system AFUE of 90% (gas) or 85% (oil). Boilers must have outdoor temperature reset or thermal purge control.

  32. Questions?

  33. Commercial Building energy standards (CBES)

  34. CBES Presentation » Overview • Key Items • Details on code update • Administration • Definitions • General Requirements • Envelope • Mechanical Systems • Service Water Heating • Electrical Power and Lighting

  35. CBES Presentation » Key Items • 2012 IECC and ASHRAE 90.1-2010 recently finalized in Fall 2010 • Significant changes to 2012 IECC initiated by joint proposals • Department of Energy (DOE) • New Buildings Institute (NBI) • American Institute of Architects (AIA) • Presentation Format

  36. Chapter 1Administration

  37. Must the Project Comply with the IECC? Comply with the Envelope Requirements Comply with the Mechanical/SWH Requirements Comply with the Power & Lighting Requirements Section 502 90.1 Section 5 Sections 503 and 504 90.1 Section 6 Section 505 90.1 Section 9 Document Compliance with the IECC Plan Review Inspection Introduction to Compliance Process

  38. Chapter 1» Administration 101.2 Scope • Code does not apply to farm structures or process applications (equipment / systems) 101.5 Compliance Exempt Buildings • Low energy buildings (<3.4 Btu/h*ft2 for space conditioning) • Unconditioned buildings • Inflatable buildings Context: Re-organizes exemptions from 2005 CBES. Inflatable & Unconditioned buildings added.

  39. Chapter 1» Administration 101.4.3 : Alterations, Additions, Renovations and Repairs • If energy use is not increased, following need not comply • Re-roofing where neither sheathing nor insulation is exposed • Alterations that replace < 50% of luminaires • Alterations that replace only bulb and ballast Context: New in 2009 IECC

  40. Chapter 1» Administration 103: Construction Documents • Added: Additional information required on construction documents • Design ambient temperatures; interior temps. for heating / cooling modes; relative humidity setpoints; ventilation rates • Added: Additional info. required on mechanical equipment schedules • Equipment efficiencies; Fan and pump nameplate motor / brake horsepower; Hydronic system (if applicable) supply / return water design temps. for boilers and all terminal devices (e.g. baseboards, unit ventilators, etc); Steam system (if applicable) design pressure for boilers and all terminal devices Context: Rarely included, but useful information for code review, commissioning, future energy audits, etc.

  41. Chapter 2Definitions

  42. Chapter 2 » Definitions Added • BUILDING ENTRANCE • BUILDING SITE • CONTINUOUS AIR BARRIER. • CONTINUOUS INSULATION (C.I.) • CURTAIN WALL • DAYLIGHT ZONE • DEMAND CONTROL VENTILATION (DCV) • ENTRANCE DOOR • FENESTRATION PRODUCT, FIELD-FABRICATED • FENESTRATION PRODUCT, SITE-BUILT • F-FACTOR • HIGH-EFFICACY LAMPS • LINER SYSTEM (Ls) • METAL FRAMING • METAL FRAMING, ENTRANCE DOOR • METAL FRAMING, FIXED • NONMETAL FRAMING • NAMEPLATE HORSEPOWER • STOREFRONT Context: Definitions complement new/revised sections of code. Many are new in 2009 IECC and some from 2012 IECC.

  43. Chapter 3General Requirements

  44. Chapter 3 » General Requirements 301: Design Conditions • 2005 CBES: broad allowance for adjustments • 2011 CBES: adjustments for • Winter heating design temperatures for projects located at either: • Elevation of 1,500 feet or higher • Caledonia, Essex or Orleans counties 2. As approved by code official or other authority having jurisdiction Context: Improve language from 2005 VT CBES which allowed adjustments for “local design conditions”

  45. Section 502Building Envelope

  46. Building Envelope 502.2.1: Roof Assembly • Added: Requirement to insulate skylight and mechanical curbs to at least R-5 Context: Skylight curbs included in proposal for 2012 IECC. Mechanical curb recommended by TAP.

  47. Building Envelope Table 502.2 (1) Envelope Tables • Envelope R-Values/U-Factors only for Vermont Climate Zone (CZ) 6 • Added additional metal building description and U-factor reference tables • Maximum Vertical fenestration area is 40% of above-grade wall area, same as 2009 IECC. 2005 CBES was 50% maximum

  48. Building Envelope - Opaque Assemblies

  49. Building Envelope - Opaque Assemblies

  50. Building Envelope - Opaque Assemblies Note: VT was already ahead of 2009 IECC. Recommendation to maintain current 2005 VT CBES values.

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