Presentation on theme: "Efficiency Vermont is a Registered Provider with The American Institute of Architects Continuing Education Systems (AIA/CES). Credit(s) earned on completion."— Presentation transcript:
0 Residential Building Energy Standards (RBES) and Commercial Building Energy Standards (CBES) Updates Better Buildings by Design Conference - February 10, 2011Navigant Consulting, Inc.(Consultants to Vermont DPS)
1 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.AIA Providers can use their own powerpoint template as long as it doesn’t have your company logos. To personalize this slide, please insert your company name in the purple area. You may change the color used in the text. All other wording on this slide is mandatory and cannot be changed.
2 At the end of this program, participants will be able to: Learning ObjectivesAt the end of this program, participants will be able to:Gain a better understanding of the current VT residential and commercial energy codesUnderstand challenges and issues related to implementation and enforcement of the energy codeUnderstand the overall process involved in current and future Vermont energy code updatesTo personalize this slide, please insert your four learning objectives in the purple area on this slide. You may change the color used in the text. Be sure that these four learning objectives are identical to the ones that were submitted on the course registration. Please remove the “sample slide” lingo from the upper right hand corner of the page.
3 Course EvaluationsIn 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.As a new requirement, Providers are required to encourage members to complete the online CES Discovery Evaluation. You may still use your own paper evaluation form to collect feedback for your personal records, however our online evaluation must still be encouraged.
4 Agenda Background and legislative history Stu Slote Residential Building Energy Standards (RBES)Lee WoodQ & ACommercial Building Energy Standards (CBES)Tim Guiterman
5 RBES Update Process Code Update Process Last Update: 2003 VT RBES ARRA Requirements: 2009 IECCMay 27, legislature adopted Act 45Stakeholder meetings held to gather feedbackAdvisory Committee meetingsDPS filed rule with ICAR (Interagency Committee on Administrative Rules)DPS held public hearingLCAR to conduct hearing and vote on ruleRule to be adopted 15 days after filedRBES handbook update
6 CBES Update Process Last Update: 2005 VT CBES ARRA Requirements: 2009 IECC or ASHRAETechnical Advisory Panel (TAP)Meetings in June and July of 2010Highlighted areas for improvementIncluded changes from current 2012 IECC / ASHRAE update processes
7 Overall direction for CBES Update CBES Update ProcessOverall direction for CBES UpdateMeet minimum 2009 IECC / ASHRAEAdd VT-specific amendments and improvementsConsider substantial changes to create 2012 IECC / ASHRAENew VT CBES codebook (VT-specific version of IECC)Continue to maintain reference to ASHRAE 90.1 standard and allow that as approved compliance pathPublic hearing on proposed rule held Jan 27Public comment period ended February 4LCAR to conduct hearing and vote on ruleRule to be adopted 15 days after filed
8 CBES Update Process Where are Commercial Codes Headed? Source: NEEP Building Energy Codes Policy 3/1/2009
10 Table of Contents Section 1: RBES Administration 2Section 2: Major Changes to RBES
11 Section 1 » RBES Administration Administration and Enforcement20032011Self certificationXCertificate of complianceFiling process to remain unchanged
12 Section 1 » RBES Administration Applicability20032011New single family homesXNew multifamily homesChange in occupancy or useChange in space conditioningAdditions, alterations, renovations, or repairs
13 Section 1 » RBES Administration Additions, alterations, renovations, or repairsConform as with new constructionUnaltered portions do not need to complyAdditions can comply alone or in combination with existing buildingExceptionsStorm windows over existing fenestrationGlass only replacementsExposed cavities already filled with insulation
14 Section 1 » RBES Administration Exemptions20032011Very low energy use buildingsXUnconditioned buildingsExisting BuildingsHistoric BuildingsOwner Built HomesHunting Camps
15 Mandatory Requirements Prescriptive Approach Section 1 » RBES AdministrationRBES Compliance PathsStartMandatory RequirementsPrescriptive ApproachPerformance ApproachEitherThere are mandatory requirements regardless of which approach you take.We’ll be focusing on the requirements of the prescriptive approach today, which is the most rigid.If you don’t want to follow this approach, the total UA alternative offers and performance approaches offer more flexibility and trade-offs.R-Values TableTotal UA AlternativeREScheckU-Factor Alternative TableHERS Rating
16 Table of Contents Section 1: RBES Administration 2Section 2: Major Changes to RBES
17 Section 2 » Major Changes to RBES Piping insulation X Vapor Retarder Mandatory Requirements20032011Piping insulationXVapor RetarderMechanical ventilationCombustion safetyAir Sealing and verificationLightingFenestration U-factorsProgrammable thermostatDuct sealing and testingEquipment sizingSnow melt system controlsPools, hot tubs and spasThese are the mandatory requirements regardless of which approach you take
18 Component R-Value Exemptions 2003 2011 Ceiling Section 2 » Major Changes to RBESBuilding EnvelopeComponentR-ValueExemptions20032011R-38 if uncompressed500 ft2 for vaulted ceilingsCeiling3849Attic access hatches and doors17” initial blow of loose‐fill cellulose for an R‐49 settled R‐valueSource: US DOE
19 Building Envelope Section 2 » Major Changes to RBES Component R-Value Notes20032011R-20 cavityorR-13 cavity + R-5 sheathingWood Frame Wall1320 or13 + 52”x 6” wall with high density FG battSource: DOE
20 Basement or Crawlspace Wall Section 2 » Major Changes to RBESBuilding EnvelopeComponentR-ValueNotes20032011R-15 continuousorR-20 cavityBasement or Crawlspace Wall1315 / 202x6 with FG batt and air barrier3” rigid XPS on exterior or interior if gypsum board is InstalledSource: Building Science Corp
21 Building Envelope Section 2 » Major Changes to RBES Component R-Value Notes20032011Heated slabs must have R-15 beneath entire slabSlab Edge10, 4ft15, 4ftSource: Building Energy Codes Program
22 Fenestration Section 2 » Major Changes to RBES Component Window U-FactorSkylight U-Factor20032011Fenestration0.400.32NR0.55NotesArea-weighted averages15 ft2 of glazing exemptOne opaque door exempt
23 Air Leakage Section 2 » Major Changes to RBES Component RBES 2003 No testing requirementsTest: < 5Visual Inspection ChecklistSource: RBES Handbook
24 Spillage Testing Section 2 » Major Changes to RBES Component RBES 2003 No testing requirementsMust establish draft without spillage within two minutesTested according to BPI gold standard or similar methodWhenever changes made that will affect spillageSource: Saturn Resource Management
25 Section 2 » Major Changes to RBES Component RBES 2003 RBES 2011 Temperature ControlsComponentRBES 2003RBES 2011Programmable ThermostatNo requirementMANDATORYLightingComponentRBES 2003RBES 2011LightingNo requirement50% of lamps in permanent fixtures high-efficacy
26 Ducts Section 2 » Major Changes to RBES No verification requirement COMPONENTRBES 2003RBES 2011Duct SealingNo verification requirementMust be verified by:*Post-construction test: Leakage to outdoors < 6 cfm per 100 ft2 of conditioned floor area (CFA)Rough-in test: Total leakage < 3 cfm per 100 ft2 of conditioned floor area (CFA)Duct InsulationR-8Same R-value as surrounding surfaces*IECC 2009 requires that duct leakage must be tested unless ducts are within conditioned space. RBES 2011 also requires ducts to be insulated to the same level as adjoining surfaces, unless located within conditioned space. So, these requirements are encouraging you to locate ducts within conditioned space and save yourself these insulating and sealing hassles.-Various means of verifying – duct blower, flow meter, flow hood, etc* Unless located within conditioned space
27 Mechanical Ventilation Section 2 » Major Changes to RBESMechanical VentilationCOMPONENT20032011Balanced systemsXExhaust-only systemsSupply-only systemsSupply only systems are rarely used in VT and can lead to moisture damage and indoor air-quality problems as warm moist air is pushed into building cavities where it condenses.
28 Domestic Hot Water Section 2 » Major Changes to RBES COMPONENT Piping InsulationVariedR-3Source: Saturn Resource Management
29 Other Requirements Section 2 » Major Changes to RBES COMPONENT Snow MeltSystemsNo requirementsMandatory automatic controlsPool HeatersMandatory on / off switchPool Covers (heated pools)Pool cover requiredR-12 minimum for hot tubs and spasHeater on/off switch to allow for turning off w/out adjusting thermostatTimers allow for pre-set schedule of on/off
30 Log Homes Section 2 » Major Changes to RBES Component 2003 2011 Basement Wall U-Factor0.100.05Floor U-Factor0.0330.026Ceiling U-Factor0.020Fenestration U-Factor0.400.30Standard for design and construction of log homes - structural, thermal, and settling provisionsBasement: R-20Floor: R-38Ceiling: R-49Log 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.
33 CBES Presentation » Overview Key ItemsDetails on code updateAdministrationDefinitionsGeneral RequirementsEnvelopeMechanical SystemsService Water HeatingElectrical Power and Lighting
34 CBES Presentation » Key Items 2012 IECC and ASHRAE recently finalized in Fall 2010Significant changes to 2012 IECC initiated by joint proposalsDepartment of Energy (DOE)New Buildings Institute (NBI)American Institute of Architects (AIA)Presentation Format
36 Introduction to Compliance Process Must the Project Comply with the IECC?Comply with the Envelope RequirementsComply with the Mechanical/SWH RequirementsComply with thePower & Lighting RequirementsSection 50290.1 Section 5Sections 503 and 50490.1 Section 6Section 50590.1 Section 9Document Compliance with the IECCPlan ReviewInspection
37 Chapter 1 » Administration 101.2 ScopeCode does not apply to farm structures or process applications (equipment / systems)101.5 ComplianceExempt BuildingsLow energy buildings (<3.4 Btu/h*ft2 for space conditioning)Unconditioned buildingsInflatable buildingsContext: Re-organizes exemptions from 2005 CBES. Inflatable & Unconditioned buildings added.
38 Chapter 1 » Administration : Alterations, Additions, Renovations and RepairsIf energy use is not increased, following need not complyRe-roofing where neither sheathing nor insulation is exposedAlterations that replace < 50% of luminairesAlterations that replace only bulb and ballastContext: New in 2009 IECC
39 Chapter 1 » Administration 103: Construction DocumentsAdded: Additional information required on construction documentsDesign ambient temperatures; interior temps. for heating / cooling modes; relative humidity setpoints; ventilation ratesAdded: Additional info. required on mechanical equipment schedulesEquipment 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 devicesContext: Rarely included, but useful information for code review, commissioning, future energy audits, etc.
41 Chapter 2 » DefinitionsAddedFENESTRATION PRODUCT, SITE-BUILTBUILDING ENTRANCEF-FACTORBUILDING SITEHIGH-EFFICACY LAMPSCONTINUOUS AIR BARRIER.LINER SYSTEM (Ls)CONTINUOUS INSULATION (C.I.)METAL FRAMINGCURTAIN WALLMETAL FRAMING, ENTRANCE DOORDAYLIGHT ZONEDEMAND CONTROL VENTILATION (DCV)METAL FRAMING, FIXEDNONMETAL FRAMINGENTRANCE DOORNAMEPLATE HORSEPOWERFENESTRATION PRODUCT, FIELD-FABRICATEDSTOREFRONTContext: Definitions complement new/revised sections of code. Many are new in 2009 IECC and some from 2012 IECC.
43 Chapter 3 » General Requirements 301: Design Conditions2005 CBES: broad allowance for adjustments2011 CBES: adjustments forWinter heating design temperatures for projects located at either:Elevation of 1,500 feet or higherCaledonia, Essex or Orleans counties2. As approved by code official or other authority having jurisdictionContext: Improve language from 2005 VT CBES which allowed adjustments for “local design conditions”
45 Building Envelope 502.2.1: Roof Assembly Added: Requirement to insulate skylight and mechanical curbs to at least R-5Context: Skylight curbs included in proposal for 2012 IECC. Mechanical curb recommended by TAP.
46 Building Envelope Table 502.2 (1) Envelope Tables Envelope R-Values/U-Factors only for Vermont Climate Zone (CZ) 6Added additional metal building description and U-factor reference tablesMaximum Vertical fenestration area is 40% of above-grade wall area, same as 2009 IECC CBES was 50% maximum
47 R - 30 + R - 5ci (with R - 5 thermal blocks) Building Envelope - Opaque AssembliesRoofs2005CBES2009 IECC /2011Roof: Insulation entirely above deckR - 24 ciUR - 20 ciUR - 30 ciUMetal BuildingsR R - 10or R - 30UR R - 19UR R - 13ciUSteel JoistR R - 5ci (with R - 5 thermal blocks)UN / AAttic and otherR - 38UNote Version sent out said R-5. R-3 is correct.
48 Building Envelope - Opaque Assemblies Walls-Above Grade2005CBES2009 IECC /2011MassR ciUR ciUMetal buildingR - 19 orR R - 13URR ciUR R ciUMetal-framedR R ciUWood-framed and otherR - 19 or R - 12 ci or R R ciUR R ci orR R ci orR - 232005 VT CBES-Equal to 2009 IECC
49 Building Envelope - Opaque Assemblies Walls-Below Grade2005CBES2009 IECC /2011Below Grade WallR - 10 ciCR ciCNote: VT was already ahead of 2009 IECC. Recommendation to maintain current 2005 VT CBES values.
50 Building Envelope - Opaque Assemblies Floors2005CBES2009 IECC /2011MassR - 10ciUR ciUJoist / Framing-Metal*R - 30UUJoist / Framing-Wood and Other*You have to look at the balance of assemblies for floors. See Appendix A of Standard 90.1 for descriptions and tables. A steel joist floor with R-38 is listed as in Table A5.3. This includes not only the thermal bridging of the joists, but also interior and exterior air films (total of R-1.38), R-1.23 for carpet and pad, R-0.25 for a 4” concrete slab and R-0 for a metal deck. A wood joist floor with R-38 is listed as U in Standard (Table A5.4), so there may be some minor round-off. This includes the resistance of a 13.25” wood joist, the same air films, the same carpet and pad, and R-0.94 for ¾” wood subfloor. The big difference is the wood subfloor is better than the concrete slab. Bottom line is that metal joist floors and wood joist floors are not assumed to have the same overall construction. There are more differences than just the joists. *Note: Final version will consolidate 2 categories into one, per 2009 IECC
51 R - 10 for entire slab (under slab and perimeter) Building Envelope - Opaque AssembliesSlab-on-Grade Floors*2005CBES2009 IECC/2011UnheatedR - 10 for 48 inchesFR - 10 for 24 inches belowFF **HeatedR - 10 for entire slab (under slab and perimeter)R - 15 for 24 inches belowFThe insulation shall extend downward from the top of the slab for a minimum distance as shown in the table or to the top of the footing, whichever is less, or downward to at least the bottom of the slab and then horizontally to the interior or exterior for the total distance shown in the table* Insulation shall be placed on the exterior of the foundation** Change to F-Value from 2005 CBES to reflect vertical installation (Or downward to bottom of slab and then horizontally for total distance shown in table)
52 Upward-Acting or Sectional Building Envelope - Opaque AssembliesOpaque Doors2005CBES2009 IECC/2011SwingingUUURoll-Up or slidingR - 10Upward-Acting or SectionalN / ANote:The insulation shall extend downward from the top of the slab for a minimum distance as shown in the table or to the top of the footing, whichever is less, or downward to at least the bottom of the slab and then horizontally to the interior or exterior for the total distance shown in the tableNote:2009 IECC / ASHRAE 90.1 only provides U-FactorsUpward-Acting or Sectional is new and unique to VT code
53 Building Envelope - Fenestration Category2005 CBES2009 IECC2011 CBESVertical Fenestration (Maximum %)50%40%Framing Materials other than Metal with or without Metal Reinforcement or CladdingU-0.35Metal framing with or without Thermal BreakCurtain Wall/StorefrontU-0.45U-0.42Entrance DoorU-0.80All OtherU-0.50U-0.55SHGC-All Frame TypesPF < 0.25U-0.400.25 < PF < 0.5NRPF >= 0.5Skylights (Maximum %)5%3%Skylights, GlassU-0.60SHGC-0.40Skylights, PlasticPlastic Not SpecifiedSHGC-0.62
54 Building Envelope 502.4. Air Leakage Context 2005 CBES and 2009 IECC: broad language2011 CBES: Mandatory continuous air barrierAir barrier compliance optionsOption 1: MaterialsOption 2: AssembliesOption 3: Building Test (0.31 cfm/ft2 of shell 50 Pa)Air Barrier penetrations-explicit language on air sealingFenestration air leakage tableContextSubstantial part of joint DOE/NBI/AIA proposal to 2012 IECCOriginally adapted from MA building code, so “field-tested” and regionally appropriate
55 Building Envelope 502.4.7 Vestibules Context Revised to reflect changes in proposed 2012 IECCUtilizes new definition of “Building Entrance”VT - specific:If vestibule is tempered, max temperature setting of 55° F; Cooling prohibitedIf tempered, shall be constructed according to envelope provisionsIf tempered, thermostat shall be programmable and inaccessible to publicContextImproved language from model IECC codesTAP recommended changes due to extensive issues with energy use due to heating and cooling of vestibules
57 Building Mechanical Systems Overview of changes due to 2009 IECCRevises equipment efficiency tables for water-chilling packages; minimum equipment efficiencies changedRequires snow melt controlRequires demand control ventilation (DCV) for certain spacesRemoves exception for energy recovery ventilation for lab fume hood systems ≤ 15,000 cfmLowers the system capacity for economizer requirement for most climate zonesIntroduces fan power limitationsIntroduces supply air temperature reset controls for multiple-zone systems
58 Building Mechanical Systems Electric Resistance Space HeatingProhibition on electric resistance space heatingCarried over from 2005 VT CBESVentilationReferences ASHRAE rather than IMCAdded language emphasizing ventilation rates to be based on expected occupancy levels versus default IMC / ASHRAE 62.1 ratesContextImportant prohibition on electric resistance heating that has worked for VT2. Prevents designers from using worst-case ventilation rates when better information is available
59 Building Mechanical Systems : Demand Controlled Ventilation2005 CBES had no DCV requirement2011 CBES (2009 IECC): DCV must be provided for each zone with spaces > 500 ft² and average occupant load > 40 people / 1000 ft² of floor area where HVAC system has:An air-side economizer, orAutomatic modulating control of outdoor air damper, orDesign outdoor airflow > 3,000 cfmChanged from 2006 IECC.Demand control ventilation (DCV): ventilation system capability that provides for automatic reduction of outdoor air intake below design rates when actual occupancy of spaces served by system is less than design occupancy
60 Building Mechanical Systems : Duct and Plenum Insulation and Sealing2005 CBES (Also 2009 IECC): Minimum R-5 (unconditioned space) and R-8 (outside building)2011 CBES : “All supply and return ducts located in unconditioned spaces shall be insulated to meet same R-value requirement that applies to immediately proximal surfaces.”Context: Altered to align with RBESPublic comments raised to address this languageClarifyFeasibilityChanged from 2006 IECC.
61 Building Mechanical Systems : Systems Performance Verification and CompletionBuildings ≥ 50,000 SFRequirements for independent, third-party commissioning agents to perform basic functional testing to verify efficient “as-designed” operation of systems specified in other parts of code, limited to:EconomizersVAV fan controlPart-load hydronic controlsPrescriptive testing requirementsFAIL
62 Building Mechanical Systems Systems Performance Verification and Completion (Continued)Context2012 IECC dedicates separate chapter to commissioning (Cx) requirementsCx for buildings > 50K ft2 as starting point for code requirementsCurrent proposal provides testing ground for future Cx requirements in VT, utilizing only large buildingsFeedback from use of 2012 IECC and VT requirements will be helpful for next update of VT codePerformance verification should ensure systems comply with code intent and operating at maximum energy efficiencyPerformance verification improves building performance, hopefully reduces contractor call-backs, issues
63 Building Mechanical Systems Revised Economizers and Economizers (Complex HVAC Systems)Economizers required on all systems ≥ 54,000 Btu / h (2005 CBES ≥ 65,000 Btu/h)Defined allowable economizer sequences to align w/ASHRAEClarified section using improved language from 2012 IECC proposalsDesign CapacityMaximum Pressure DropIntegrated Economizer ControlContextMatches 2009 IECC capacity thresholdNeed to clarify 2005 VT CBES and Economizer sections in 2009 IECC vagueNational IECC code also using these changes to align w/ ASHRAE 90.1
64 Building Mechanical Systems VAV Fan Control / Hydronic Systems Controls /Added: Static Pressure Sensor Location languageRevised: Hydronic variable flow systems languageAdded: Chilled and Hot Water Temperature ControlsContextLanguage not in 2009 IECC but existed in ASHRAELanguage taken from
66 Service Water Heating 504.1.1 Electrical Water Heating Limitation Added: Electric service water heating units shall be limited to a maximum of 5 kW total power inputContext: Carried over from 2005 VT CBESESYes, that is David Hasselhoff
67 Section 505 Electrical Power and lighting systems
68 Electrical Power and Lighting Major changes to electrical power / lighting due to 2009 IECCAdds high-efficacy lighting requirement for dwelling unitsRequires separate controls for daylight zonesAllows for use of photocell in tandem with other controls on certain exterior lighting applicationsAdds exempted lighting applications that can be excluded from total connected interior lighting power calculationsRevises additional lighting power allowance calculations for retail areasCreates four exterior lighting zones based on lighting need
69 Electrical Power and Lighting Interior Lighting Power AllowancesBuilding Area Method and Space by space Method includedLPD values taken from proposed 2012 IECC valuesContext2005 VT CBES contained both methods but 2009 IECC still only used Building Area Method2012 IECC will have both methods2005 VT CBES values identical to 2009 IECC2012 IECC values include revised categories, higher efficiency for certain categories, and scaled back values for others2011 VT CBES will be aligned with 2012 IECC and ASHRAE
70 Electrical Power and Lighting Interior Lighting Power AllowancesChanges to Building Area Method SpacesAll others unchanged from 2005 CBESSome changes in space-by-space types:Revised categories, higher efficiency for certain categories, and scaled back values for others2005CBES2009 IECC2011Office1.00.9Retail1.51.4Fire Station0.8Warehouse0.6
71 Electrical Power and Lighting Motors and TransformersAdded NEMA efficiency tables for motorsAdded NEMA efficiency tables for transformersContextVT CBES included these. Maintained in 2011 VT CBES. Motor tables are included in ASHRAEVT CBES included these. Maintained in 2011 VT CBES.