Presentation 9/21/11 by Greg Krantz to Green Needham on the Stretch Energy Code.

1. Helping Massachusetts Municipalities Create a Greener Energy Future
Stretch Code Informational
Session
Sept. 21, 2011
Greg Krantz
ICF International

2. Topics
 IECC 2009 Overview
 What is the Stretch Code?
 Discussion and Q&A

3. Energy Codes in MA are changing
 New base energy code in July 2010 (IECC 2009)
 Roughly 10-15% more efficient than IECC 2006
10-
 Next I-Code 1/1/2013-Designed to be 30% better
I- 1/1/2013-
 New phase of outcome-based Energy Codes
outcome-
 Stretch Code appendix 115.AA
pp
 Approx 15-20% more energy
15-
efficient than the base code
(IECC 2009/AHRAE 90.1 2007)
 Commercial bldgs. ASHRAE 90.1-2007 remains
g 90.1-
ASHRAE 90.1 = Energy Standard for Buildings Except Low‐Rise Residential Buildings
IECC = International Energy Conservation Code – of International Codes Council (ICC)

4. IECC and ASHRAE Codes
 ICC & ASHRAE develop model building codes
and standards for the US.
 ICC: publishes IECC energy code
 3 year cycle IECC 2006, IECC 2009
2006
 ASHRAE: publishes 90.1 standard
 3 year cycle 90.1-2007, 90.1-2010
90.1- 90.1-
IECC = International Energy Conservation Code – of International Codes Council (ICC)
ASHRAE = American Society of Heating, Refrigerating and Air-Conditioning Engineers

5. IECC 2009 and the MA 8th
Edition
 IECC 2009 and the Stretch Appendi
nd Appendix
115.AA Codes address energy only
 MA 8th Edition will address all codes
(structural, plumbing, etc.)
(structural plumbing etc )

6. What’s Changed Since IECC 2006?
What s
 New requirements include:
 Building envelope tightness
 Duct testing
 Lighting equipment
g g q p
 No moisture control requirements (framed
walls,
walls floors and ceilings)

7. STRETCH ENERGY CODE
APPENDIX 115.AA

9. Why an Optional Stretch Code?
 Growing desire to reduce costs, reduce
costs
dependency on imported fuels, and address
climate change
 Several towns and cities asked for the ability to
adopt stronger building codes
 BBRS developed one alternative code that is
consistent across the state
i h

10. What does the Stretch Code Apply
to?
 Residential  Commercial
(5,000-
(5,000-100,000 sq/ft)
 New Construction
 New Construction
 Additions
 Additions
 Home Renovations
 Historic Home Exemption  Renovations Exempt

12. Residential New Construction

13. Performance Path
 Performance Path is the only option
 Uses Home Energy Rating System (HERS)
 70 or less < 3,000 sq ft.
 65 or less > 3,000 sq ft.
 Requires a certified HERS rater
q
 Review building plans
 Check insulation installation
 Thermal bypass Checklist
 Blower-door and duct testing
Blower-
Image source: www.lexingtoninfrared.com/hers-ratings.php

14. What is a HERS Rating?
 Home Energy Rating System
(HERS) Index
 Each home is tested, certified
and labeled by an independent
y p
HERS Rating Company
 Must follow Residential Energy
Services Network (RESNET)
testing procedures
 A HERS Rater uses software to
model the h
d l h home’s energy
’
performance based on plan analysis
and on-site testing to calculate a
on-
HERS I d (C b used i
Index. (Can be d instead
d
of ResCheck)

15. What is the Thermal Bypass Checklist?

16. Stretch Code vs. IECC
Comparison
Typical Existing
Home
Std New Home
IECC 2006
IECC 2012
~ HERS 70

17. Home Additions

18. Performance or Prescriptive Path
Addition Only
 Performance Path
 70 or less < 3,000 sq ft.
 65 or less > 3,000 sq ft.
Prescriptive Path
P i i P h
 ENERGY STAR Windows (U=.30)
 Duct leakage under 4 cfm per 100 sq ft
 Builder Verified Thermal Bypass Checklist

19. Home Renovations

20. Performance or Prescriptive Path
 Performance Path is easier than for new
construction and additions
 Easier HERS index requirement (mostly relevant for
gut-
gut-renovations)
 85 or less < 2,000 sq ft.
 80 or less > 2,000 sq ft.
 Prescriptive Path
P i ti P th
 Same as additions
 Requirement for insulating empty cavities if wall
sheathing is exposed
Image source: http://www.wilkinsonbuild.co.uk/Portals/5/Renovation/renovation2.jpg

21. Stretch Code and ENERGY STAR
 The Stretch appendix almost puts the current
ENERGY STAR H Homes program i into code
d
 ENERGY STAR is a proven cost-effective
cost-
program
 Approx 30% in 2010 of new homes in MA
 Builder incentives/rebates
 Incentives up to $8000,
 Rebates on appliances,
heating and cooling, lighting, etc.
 Builder training and materials
 Subsidized HERS raters
 Third party verification

22. COMMERCIAL STRETCH CODE

23. Commercial ‘Stretch’ Appendix
Stretch
 Addresses the construction of new commercial
buildings and additions over 5,000 ft2
 Two Options (depending on size)
• Performance option - 20% below Code
• Prescriptive option for most building types
5,000 - 100,000 ft2

26. Compliance
Codes and Training

27. Code Compliance & Inspections
 Essentially the same as base code
E ti ll th b d
 Code Official has the same authority
 Same building inspections
 Approves building documents,
Energy Star and HERS rating or
ASHRAE modeling as g
documentation of energy compliance

28. Training on new energy codes
 Covering both the IECC 2009 & Stretch code
 Provided free to all Code Officials
d d d
 Includes IECC code book and Stretch appendix
 Provided at cost to building professionals
 Register online: www.cetonline.org/Events/events.php
 Separate Commercial and Residential sessions
 Energy star homes training available for free:
www.energystarhomes.com/
 Utilities offer commercial ‘Core Performance’ energy
training
i i

29. Stretch Code
Case Studies

34. Questions?