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Needham stretch code overview 09-21-11
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)
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
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)
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
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
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
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