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Code Informational Session November 13, 2013

Code Informational Session November 13, 2013. Introduction to the IECC 2012 Energy Code. Agenda. The wonderful world of Acronyms. ASHRAE American Society of Heating, Refrigeration and Air-Conditioning Engineers ICC International Codes Council

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Code Informational Session November 13, 2013

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  1. Code Informational Session November 13, 2013

  2. Introduction to the IECC 2012 Energy Code

  3. Agenda

  4. The wonderful world of Acronyms ASHRAE American Society of Heating, Refrigeration and Air-Conditioning Engineers ICC International Codes Council IECC International Energy Conservation Code IRC International Residential Code DOER Department of Energy Resources HERS Home Energy Rating DOE Department of Energy

  5. IECC and ASHRAE Codes • ICC & ASHRAE develop model building codes and standards for the US. • ICC: publishes IECC energy code • 3 year cycle IECC 2009, IECC 2012, IECC 2015 • ASHRAE: publishes 90.1 standard • 3 year cycle 90.1-2007, 90.1-2010

  6. The World of Codes • 1980’s through 2006 • Minimum codes were truly minimal • DOE pushed for marginal improvements (1% to 3% per cycle) • DOE proposed (successfully) a major rewrite of the IECC in 2004 (became the 2006 IECC)—emphasis was format, not stringency • 2009 to present • The world has changed • ICC/DOE working from two goals • 30% improvement in 2012 IECC (relative to 2006) • 50% improvement in 2015 IECC (relative to 2006)

  7. What in the world has changed? • What is driving the changes to the code: • Public interest • Political will • Pull at ICC • What in the world has changed? • More efficiency making it into codes • More detail/complexity being pushed onto code officials • More need for expertise and analysis tools in code process • Less distinction between code, beyond-code programs

  8. 6th edition of the building code had a MA specific energy code 7th edition adopted IECC 2006 Commercial bldgs. ASHRAE 90.1-2004 8th edition adopted IECC 2009 on July 1, 2010 Roughly 10-15% more efficient than IECC 2006 Commercial bldgs. ASHRAE 90.1-2004 remains Also in 2010 the edition of the “Stretch Code” appendix IEC C 2012 was adopted on 7/1/2013 Designed to be 30% better than IECC 2009 Stretch Code IECC 2015 coming soon…. Massachusetts Energy Code History

  9. IECC 2012

  10. What was added with IECC 2009 Lighting added to IECC scope (at least 50% of lamps must be ―high efficacy) Mandatory duct system pressure test Insulation R-Values increases No equipment-envelope trade-offs 12% to 15% better than 2006 IECC

  11. 2012 IECC –Overview Approximately 30% more efficient than the 2006 IECC Now constitutes (by reference) the energy chapter of the International Residential Code (IRC) Retains 2009 IECC’s prohibition on envelope-equipment tradeoffs Contains a few major and many minor changes

  12. Structure of the 2012 IECC Ch. 1 Scope and Application / Administrative and Enforcement Ch. 2 Definitions Ch. 3 General Requirements Ch. 4 Residential Energy Efficiency Ch. 5 Referenced Standards Index

  13. Scope of Section R101 • Defines Residential Buildings as: • One- and two-family dwellings, townhouses of any size and R-2, R-3, R-4 ≤ 3 stories • All buildings that are not “residential” by definition are “commercial” • Includes additions, alterations, renovations and repairs • Existing buildings • Buildings designated as historic • Very low energy use buildings [<3.4 Btu/h-ft2 or 1 watt/ft2]

  14. Scope Section R101- Additions Treat as a stand-alone building Additions must meet the prescriptive requirements in Table 402.1.1 (or U-factor or total UA alternatives)

  15. Scope Section - Additions, Alterations, Renovations, Repairs • Code applies to any new construction • Unaltered portion(s) do not need to comply • Additions can comply alone or in combination with existing building • Replacement fenestration that includes both glazing and sash must meet • U-factors in all Climate Zones 2-8

  16. Climate Zones for the 2012 IECC

  17. Scope Section R101 - Additions, Alterations, Renovations, Repairs-Exceptions • Storm windows over existing fenestration • Glass-only replacements • Exposed, existing ceiling, wall or floor cavities if already filled with insulation • Where existing roof, wall or floor cavity isn’t exposed • Reroofing for roofs where neither sheathing nor insulation exposed • Insulate above or below the sheathing • Roofs without insulation in the cavity • Sheathing or insulation is exposed • Lighting alterations if: • <50% of luminaries in a space are replaced • Only bulbs and ballasts within existing luminaries are replaced (provided installed interior lighting power isn’t increased)

  18. Scope Section R101 - Space Conditioning • Any non-conditioned space that is altered to become conditioned space shall be required to be brought into full compliance with this code • Examples: • Converting a garage to a family room • Heating an unfinished basement

  19. Scope Section R101 - Mixed Use Buildings Treat the residential occupancy under the applicable residential code Treat the commercial occupancy under the commercial code

  20. Overview of Code Structure Climate-Specific Requirements: Mandatory Requirements (apply everywhere): Infiltration control Duct insulation, sealing, and testing HVAC controls Piping Insulation Equipment sizing Dampers Lighting • Roofs • Above grade walls • Foundations • Basements • Slabs • Crawlspaces • Skylights, windows, and doors

  21. Overview of IECC 2012 Residential Code Requirements Focus is on: Building envelope ceilings, walls, windows, floors, foundations Sets insulation and fenestration levels, and solar heat gain coefficients Infiltration control - caulk and seal to prevent air leaks, and test Ducts, air handlers, filter boxes – seal, insulate, and test Limited space heating, air conditioning, and water heating requirements Federal law sets most equipment efficiency requirements, not the I-codes No appliance requirements Lighting equipment – 75% of lamps to be high-efficacy lamps or 75% of lighting fixtures to have only high-efficacy lamps

  22. Compliance IECC Terminology • Prescriptive, UA/U-Factor and Performance • Mandatory requirements • Required and cannot be traded down, even in the simulated performance path • Some elements have “hard limits”aka, “trade-off limits” • a prescriptive requirement that can only be traded so far • performance requirements can only be traded so far

  23. IECC Compliance - Three Options

  24. Code Compliance Tools

  25. Overview of the 2012 Energy Code The 2012 code requires a better envelope, insulation, ducts, windows, mechanical and more efficient lighting than the 2009 code.

  26. 2012 IECC Major Changes • Duct leakage rates lowered • Domestic hot water piping must be either • Insulated to R3, or • Short and skinny (i.e., exempted lengths depend on diameter) • Eliminated ―leakage to outdoors option for ducts • From 12 to 4 CFM/100sf CFA (after construction) • From 6 to 4 CFM/100sf CFA (at rough-in) • Various R-value/U-factor/SHGC improvements

  27. 2012 IECC Major Changes • New mandatory whole-house pressure test (blower door) with stringent required leakage rates • Zones 3-8: ≤ 3 ACH @50 Pa • Address fireplaces and recessed lighting fixtures

  28. Air Tightness Requirements • Compliance • The 2012 code provides a lot of leeway to the local inspector; according to the code, “Where required by the code official, an approved third party shall inspect all components and verify compliance.” • Reference Table R402.4.1.1 for requirements • http://publicecodes.cyberregs.com/icod/iecc/2012/icod_iecc_2012_re4_sec002_par027.htm

  29. Building Envelope Specific Requirements Building Envelope consists of: Fenestration Ceilings Walls Above grade Below grade Mass walls Floors Slabs Crawlspaces

  30. 2012 IECC –Major Prescriptive Envelope Changes

  31. Insulation Verification • R-values are to be printed on the batt insulation or rigid foam board. • Blown-in insulation must have an insulation certificate at or near the opening of the attic. • The certificate should include: • R-value of installed thickness • Initial installed thickness • Installed density • Settled thickness/settled R-value • Coverage area • Number of bags installed • Insulation markers must be installed every 300 square feet and be marked with the minimum installed thickness and affixed to the trusses or joists.

  32. 2012 IECC-Fenestration Changes

  33. Mandatory Requirements Mechanical Systems • Controls-At least one programmable thermostat/dwelling unit • Heat pump supplementary heat • Ducts • Sealing (Mandatory) • Insulation (Prescriptive) • HVAC piping insulation • Circulating hot water systems • Ventilation • Dampers • Equipment sizing-Heating and cooling equipment shall be sized according to Manual S based on loads calculated according to Manual J • Pools and in ground permanently installed spas • Snow melt controls

  34. Duct Sealing and Insulation Duct Sealing Duct Insulation Supply ducts in attics: R-8 (Attic) All other ducts: R-6 (Basement, Crawlspace, Exterior Wall,) • Mandatory test 3 cfm ACH@50 • Rough in and post construction tests • Adopts testing widely used by Stretch Code / Energy Star Homes • Not required if located within conditioned space • Framing cavities cannot be used as ducts or plenums

  35. Lighting Equipment • A minimum of 75% of the lamps in permanently installed lighting fixtures shall be high-efficacy lamps or 75% of permanently installed lighting fixtures to contain only high efficacy lamps. • “Lamps in fixtures” • Exception: • Low-voltage lighting • Use specified lighting

  36. High Efficacy Lighting and Compliance • The residential lighting provisions in the 2012 IECC are relatively simple. • At least 75% of the lamps in permanent light fixtures must be high-efficacy, defined as: • T8 or smaller-diameter linear fluorescent lamps, • Or lamps such as CFLs, LEDs or Pin Based Lamps with a minimum efficacy of: • 40 lumens/W for <15W • 50 lumens/W for 16-40W • 60 lumens/W for >40W lamps • Chandelier example

  37. Ventilation • The building shall be provided with ventilation that meets the requirements of the IRC, IMC, or other approved ventilation. • Minimum efficacy: • Range hoods 2.8 cfm/watt • In-line fans 2.8 cfm/watt • Bathroom fan (10-89 cfm) 1.4 cfm/watt • Bathroom fan (90+ cfm) 2.8 cfm/watt

  38. What about mechanical ventilation? • Although the 2012 IECC includes provisions to improve a home’s air tightness, it provides little on whole house ventilation, however the 2012 IRC does include requirements for mechanical ventilation. • A typical home will require about 15 cfm per person of fresh outdoor air to be distributed by continuous mechanical ventilation to meet the requirements of the code. • The new code requires homes in zone 5 achieve 3 ach50, the code effectively mandates a whole-house mechanical ventilation system. • This can be accomplished with a centrally located quiet exhaust fan, an interconnected system to the air handler, HRV/ERV or a combination of devices.

  39. Eave Baffles • For air permeable insulations in vented attics, baffle • Installed adjacent to soffit and eave vents • To maintain an opening ≥ size of vent • To extend over top of attic insulation • May be of any solid material

  40. Stretch Code vs. IECC Comparison Typical Existing Home Std New Home IECC 2006 IECC 2009 ~ HERS 90 Stretch Code < 3000 sq ft - HERS 70 > 3000 sq ft - HERS 65 IECC 2012 ~ HERS 70

  41. Residential Incentives Almost the same as the Stretch Code/IECC 2012 Approx 30% of new homes in MA Builder incentives/rebates $750 - $7000 for SFD $350 - $4,000 for MF HERS raters $700 - $900 SFD $250 - $550 MF Additional Equipment Rebates Appliances – up to $50 (low income) Heating – up to $1,500 Water Heating – up to $800 Cooling – up to $500 Lighting – free CFLs Massachusetts Residential New Construction Program

  42. IECC 2012 Bottom Line Code Compliance Every new home built will need to be tested with a blower door, have a strategy to stop thermal bridging, need more insulation, a tighter envelope, better windows, tighter ducts, right sized mechanical systems, more efficient lighting and mechanical ventilation.

  43. Stretch Code Appendix 120.aa

  44. What is the Stretch Code? • Affects the energy code only • Amendment to the MA base energy code • Residential Construction: • 15-20% more energy efficient • Commercial: • 20% more energy efficient • The Stretch Code is similar to the 2012 IECC

  45. Misconceptions The Stretch Code is new and experimental The Stretch Code requires tight unhealthy homes The Stretch Code requires foam insulation The Stretch Code requires mechanical ventilation Homes with oil heat cannot meet the Stretch Code Town residents will be required to update their existing homes

  46. What does the Stretch Code Apply to? • Same application as the MA base energy code • Insulation • Doors, Windows, Skylights • Mechanical Equipment • Lighting • Appliances • Building tightness • Duct tightness • Renewables

  47. What does the Stretch Code Apply to? • Residential • Additions • Home Renovations • New Construction • Commercial (5,000+sq/ft) • New Construction • Additions • Renovations Exempt

  48. Additions and RenovationsPrescriptive or Performance Path • Prescriptive Path • ENERGY STAR Windows, Doors and Skylights • Tight Ducts – completely new duct systems only • Contractor Verified Thermal Bypass Checklist • Performance Path • Whole house HERS Rating • Renovations: • HERS 85 < 2,000 sq ft. • HERS 80 ≥ 2,000 sq ft. • Additions: • HERS 70 < 3,000 sq ft. • HERS 65 ≥ 3,000 sq ft.

  49. New HomesPerformance Path • Performance is the only option • HERS 70 < 3,000 sq ft. • HERS 65 ≥ 3,000 sq ft. • HERS Rating Company • Review building plans • Thermal bypass Checklist • Blower-door and duct testing

  50. Home Energy Rating System (HERS) Index Internal Revenue Service U.S. Department of Energy U.S. Environmental Protection Agency Mortgage Industry Massachusetts Base Code - Alternative Path Mass Save Residential New Construction Program New HomesPerformance Path

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