Presents. The 2012 Summer Energy Forum. Adoption of the 2012 International Energy Conservation Code

Transcription

1 Presents The 2012 Summer Energy Forum Adoption of the 2012 International Energy Conservation Code

2 Comparison between Proposed Minnesota Energy Code and the Current MN Code (Chapter 1322) Isaac Elnecave Senior Policy Manager Midwest Energy Efficiency Alliance June 18, 2012

3 Purpose Compare the Proposed MN Energy Code to the Current Energy Code (Chapter 1322)

4 MEEA s Role in the Midwest Nonprofit serving 13 Midwest states 10 years serving utilities, states and communities Staff of 24 in Chicago Actions Advancing Energy Efficiency Policy Designing & Administering EE Programs Delivering Training & Workshops Coordinating Utility Program Efforts Regional Voice for DOE/EPA & ENERGY STAR Evaluating & Promoting Emerging Technologies

5 Residential Building Energy Code Adoption in the Midwest As of June 2012 * Code Level / Equivalence No Mandatory Statewide Code 2006 IECC 2009 IECC 2012 IECC Eff. ~01/13 Eff. 01/13 * In 2009 Adopted by Major Municipality Process to 2012

6 Code Development Process New Code Published Every Three Years Amendments Accepted from All Parties Code Development Committee Vets/Votes on all Amendments Proponents and Opponents Given Opportunity to Present Case At Final Action Hearing, a second vote is taken on each amendment. Only State and Local Code Officials Can Vote

7 Energy Savings 2012 IECC Roughly 30% More Energy Efficient than 2006 IECC (on a national basis) 2012 IECC Roughly 15% More Energy Efficient than 2009 IECC (on a national basis)

8 Work So Far In MN Department of Labor and Industry (DLI) Proposed Draft Code (Based on 2012 International Energy Conservation Code) Residential Code Advisory Committee Reviewed the Draft, Proposed, Considered and Voted on Amendments. Advisory Committee Draft Under Review by DLI Advisory Committee Draft Similar to 2012 IECC; Two Key Amendments: Relaxation of Above Grade Wall Insulation Requirement for Balanced Ventilation

9 Key Changes to Res. Energy Code Air Infiltration/Blower Door Testing Duct Testing Window U-Factor and Solar Heat Gain Coefficient Above Grade Wall Insulation Basement Insulation Ceiling Insulation Efficient Lighting Whole House Mechanical Ventilation Piping Insulation Minor Changes

10 Air Infiltration (For Entire State) Infiltration Req. Notes Current Code Proposed MN Code Sealing Specific Items Requires Sealing a List of Specified Items such as utility penetrations and attic access openings (actual list is longer) 3 ACH50 & Checklist Blower Door Test Can Be Done Anytime After Creation of Building Envelope Penetrations

11 Ducts (For Entire State) Leakage Requirement Current Code Proposed MN Code Notes: Rough In Leakage Rate Post-Construction Leakage Rate Per Chapter 1346 of Minnesota Mechanical Code 4 CFM25 Total 3 CFM25 if Air Handler not installed 4 CFM25 Total NO TEST REQUIRED if DUCTS AND AIR HANDLER ARE ENTIRELY IN CONDITIONED SPACE LEAKAGE RATES ARE MEASURED PER 100 SQ. FT. (2012 IECC)

12 Window U-Factor (For Entire State) Window U- Factor Skylight U- Factor Solar Heat Gain Coefficient Current Code NR Proposed MN Code NR Notes: Energy Star Windows are at U-Factor of 0.30

13 Ceiling Insulation Climate Zone 6 Climate Zone 7 Current Code R-38 R-44 Proposed Draft Code R-49 R-49 Note With use of Raised Heel Truss; Proposed Code Allows Use of R-38

14 Basement Insulation Climate Zone 6 ClimateZone 7 Current Code R-10 U-0.10 R-10 U-0.10 Proposed MN Code Exception R15/R-19 U R15/R-19 U If the Following Four Conditions are Met; Current Code Allows the Use of R-5 1. Insulationis located on the exterior or is integral to the foundation wall 2. Additional R-5 added to ceiling insulation 3. Heating system is high efficiency 4. 6in. Raised Heel Truss is used

15 Above Grade Wall Insulation Climate Zone 6 ClimateZone 7 Current Code R-Value U- Factor R19 or R13+5 R-Value U-Factor R Proposed Code R-21 or R20+5 or R R-21 or R20+5 or R

16 Lighting (For Entire State) Current Code Proposed Code Notes Efficient Lighting Requirement None 75% of Lampsor Permanently Installed Fixtures High Efficacy Lamps Defined as Compact Fluorescent Lamps T-8 or Smaller for Linear Fluorescent Lamp 60 lumens/watt for lamps over 40 watts 50 lumens/watt for lamps between 15 and 40 watts 40 lumens/watt for lamps under 15 watts

17 Ventilation (For Entire State) Current Code Proposed Code Whole House Continuous Yes Yes Ventilation Rates (similar) Ventilation Rates Equivalent to ASHRAE Types Exhaustor Balanced Balanced Noise 1 Sone None BalancedVentilation: A residential ventilation system where the design fan powered exhaust air is equal to the fan powered supply air

18 DHW Piping Insulation R-3 Required on Piping (typically higher than current MN RQMTS except for large pipes carrying very hot fluids) Greater than 3/4 nominal diameter Serving more than 1 dwelling unit From water heater to kitchen outlets Located outside the conditioned space From water heater to distribution manifold Under the floor slab That is buried That is supply and return in recirculating systems other than Nominal demand Pipe recirculation Diameter of systems Largest 3/8 ½ ¾ > 3/4 Diameter Pipe in the Run (feet) That have run lengths longer than the chart below Maximum Run Length

19 Minor Requirements Eave Baffles Clarification of Steel Frame Wall Requirements Sunroom Insulation (Made more stringent) Framing Cavities Cannot Be Used as Ducts or Plenums Certificates Must Include Results of Testing Pools and In ground Permanently Installed Spas Heaters must have accessible on/off switch NG not allowed with continuous pilot lights Time Switches Vapor Retardant Cover

20 Moisture Control Proposed Code Includes Language Designed to Ensure Proper Installation of Insulation to Limit Moisture/Durability Problems. Language is Found in Current Code and was a Result of Collaborative Work between Homebuilders, Dept. of Labor and Industry and Building Science Experts.

21 Contact Info Isaac Elnecave, Senior Policy Manager Midwest Energy Efficiency Alliance

22 Energy Savings and Upgrade Costs BAMN Energy Code & Housing Summit Minimum code Insulation Levels Minimum code with Walkout Northern MN Zone 7

23 Current Minimum Code Levels Exception: In the Southern Zone, the foundation and rim joist area insulation may be reduced to a minimum of an R-5 if: 1. The insulation is located on the exterior or is integral to the foundation wall; and 2. An additional R-5 insulation is added to the minimum attic R-value level; and 3. The heating system meets the minimum efficiency ratings in Table N ; and 4. A minimum of a six-inch energy heel is used for the roof framing and/or truss system

24 MINNESOTARULES, CHAPTER1322 ADOPTION OF THE2012 INTERNATIONAL ENERGYCONSERVATIONCODE(IECC) (RESIDENTIALPROVISIONS) CLIMATE ZONE FENESTRATION U-FACTOR CEILING R-VALUE WOOD FRAME WALL R-VALUE BASEMENT WALL R-VALUE SLAB R-VALUE & DEPTH and or 20+5 or h 15/19 10, 3.5 ft 21 or 20+5 or h 15/19 10, 5 ft

25 2012 IECC Building tightness Requires air leakage less than 3 ACH50 (2532 sq. ft. = 1013 cfm50) Most homes being tested meet this requirement, but only premier builders are having their homes tested What % of all new homes will pass?

26 2012 IECC Duct Tightness Ducts must be sealed and building cavities cannot be used as ductwork. Ductwork outside the thermal envelope must be tested to verify it is tighter than 4 cfm25/100 square feet of conditioned floor area.

27 Minimum code changes current to 2012 ceiling rim walls foundation R43 to R49 R5E to R21 R19 to R21 R5 to R15 windows U 0.32 to U 0.35

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29 Revised with Walkout

30 SAVINGS Full Bsmt. and Walkouts full south north basement walkout walkout ceiling $5 $5 $6 rim $35 $35 $25 walls $14 $16 $24 foundation $91 $97 $31 windows $17 $19 $122 lighting $108 $108 $120 total $270 $280 $328

31 Walkout vs Full Basement Walkout Full Bsmt. savings cost payback savings cost payback ceiling $5 $97 20 ceiling $5 $97 20 rim $35 $296 8 rim $35 $296 8 walls $16 $ walls $14 $ foundation $97 $564 6 foundation $91 $827 9 windows $19 $ windows $17 $ lighting $108 $159 1 lighting $108 $159 1 ductwork na $600 na ductwork na $600 na Blower Blower Door na $150 na Door na $150 na total $280 $2,122 8 total $270 $2,362 9

32 Defining High Performance, Low Energy We know that buildings can be designed today to operate with less than half the energy of the average U.S. building at no additional cost. Ed Mazria, Architect and founder of architecture2030 It s the Architecture, Stupid,

33 Low energy defined as 50% or less energy Less than what? Code? Existing? Typical? Building to code in a cold climate will generally not result in a low-energy house Where I live and work 33

34 Average energy use A RELATIVE SCALE, BUT RELATIVELY VAGUE. Images provided by Building Science Corp 34

35 We use a baseline of current code and compare versions of the same house Modeled Energy Data - House X 2006 IECC Code Design Peak Heating Load Btu/hr 43,200 Btu/hr 19,900 Btu/hr Btu/hr/ft Btu/hr/ft Btu/hr/ft2 Annual Heating Load Code Design MMBtu/year 93.8 MMBtu/yr 32.1MMBtu/yr kbtu/ft2 annual kbtu/ft2/yr kbtu/ft2/yr 35

36 Esko House Sloping site, very open site Faces due south Basement + 2 stories 3 occupants Generous area/space plan Strong client desire for low-energy 36

37 REAL ENERGY USE Costs about $300 a year to heat (dual fuel electric rate) 3.5 kbtu/ft2/year in electric heat and 4.6 kbtu/ft2/year in wood. Uses about 1/3 of the energy that it would have used if built to code. 37

38 Skyline House Steep site, constrained boundary Faces southeast Walk-out basement + 1 story 4 occupants Generous area/space plan Strong client desire for low-energy 38

39 REAL ENERGY USE: Costs about $200/year to heat The house is using about 4.57 kbtu/ft2/year in gas for heating. Uses less than 1/4 of the energy it would have used if built to code. 39

40 Comparing 3 integrated solutions Size Wall Design Modeled Gross area Thickness/type Heating Energy Conditioned area R-value Total MMBtu/yr Skyline 2950 ft2 14 double stud kbtu/ft2/year 19.4 MMBtu 2660 ft2 R kbtu/ft2 Esko 3150 ft2 15 double stud 20.5 MMBtu 2690 ft2 R kbtu/ft2 White Iron 1550 ft2 7 (2 x foam) 21.5 MMBtu 1480 ft2 R kbtu/ft2 40

41 Seeing the Forest for the Trees "When we try to pick out anything by itself, we find it hitched to everything else in the Universe." - John Muir ( ), engineer, naturalist 41

42 Thank you. 17 N Lake Avenue Duluth, MN

43 Habitat for Humanity 2012 IECC 33 Affiliates in Minnesota 125 Homes per year ENERGY STAR 3.0 standard Homes are not free

44 North St. Louis County HFH Itasca County HFH R-50 (+) Attic

45 North St. Louis County HFH Itasca County HFH R-50 (+) Attic

46 North St. Louis County HFH Lakes Area HFH Exterior Insulation Continuous Insulation

47 North St. Louis County HFH Lakes Area HFH Exterior Insulation Continuous Insulation

48 Itasca County HFH Exterior Insulation Continuous Insulation

49 La Crosse Area HFH Exterior Insulation Continuous Insulation

50 La Crosse Area HFH Exterior Insulation Continuous Insulation

51 Winona County HFH Exterior Insulation Continuous Insulation

52 East Central HFH Exterior Insulation Continuous Insulation

53 La Crosse Area HFH Rim Insulation

54 North St. Louis County HFH Lakes Area HFH Exterior Insulation Slab / Foundation Insulation

55 North St. Louis County HFH Lakes Area HFH Exterior Insulation Foundation / Slab Insulation

56 East Central Exterior Insulation Slab / Foundation Insulation

57 Rochester Area HFH Exterior Insulation Slab / Foundation Insulation

58 Rochester Area HFH Exterior Insulation Slab / Foundation Insulation

59 Rice County HFH Exterior Insulation Slab / Foundation Insulation

60 Rice County HFH Exterior Insulation Slab / Foundation Insulation

61 Habitat for Humanity ACH50

62 Habitat for Humanity Winter Heating Cost Comparison

63 Foundation Insulation: Best Practices for Efficient and Durable Homes MPBA Summer Forum 2012 IECC Code Adoption Patrick H. Huelman Cold Climate Housing Coordinator University of Minnesota Extension

64 Context Borrowing from a current NorthernSTARBuilding America project. Project 2.1 Foundation Insulation for New Construction Objectives Assessing foundation insulation strategies to meet IECC 2012 and beyond. Addressing builder acceptance and concerns with focus on hygrothermal performance issues. Identifying best practices for robust foundations.

65 Introduction to Building America Focus is to reduce energy use by 50% in new houses and 30% in existing residential buildings. Promote building science using a systems engineering and integrated design approach. Do no harm => we must ensure that safety, health, and durability are maintained or improved. Accelerate the adoption of high-performance technologies.

66 Building America Industry Consortia NorthernSTAR Building America Partnership Habitat Cost Effective Energy Retrofit Program Building Energy Efficient Homes for America

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71 Foundation Insulation: Best Practices for Efficient and Durable Homes Questions

72 Summary Cost estimates to the IECC 2012 (without amendments) were slightly less but comparable to BAMN s DOLI has already proposed an R21 option. The cost estimates including this option are closer to $3,000 than $7,000. BAMN s annual energy savings were miscalculated. Actual energy savings were $273.

73 Payback Numbers New energy code at least 20% more energy efficient MBPA s analysis showed an average payback of 11 years for Climate Zone 6 to go to IECC 2012 with MN-specific amendments (including R21 wall insulation)

74 Air Tightness Testing Blower Door tests average $150/test per home. Achieving 3ACH(50) should be easy for MN builders. For those not meeting this already, it will raise the bar. A certificate provides verification to homeowners and encourages builders to build better.

75 Foundation Insulation BAMN s support for R10 refers to study that pertains only to foundation walls that are mostly below-grade. Many new homes have walk-outs or more exposed foundation walls and experience a larger change in temperature from top to bottom, needing an increase to R15. ARRA requirements are R15

76 Moisture Issues DOLI has already agreed to address moisture issues and is inserting current moisture/durability language into the proposed draft.

77 What next? DOLI will release draft for public comment