2009 versus 2012 IECC
Maryland Affordable Housing Coalition
June 26th, 2012
2009 versus 2012 IECC
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Overview
Reading the Code on Your Own
Compliance Paths
Low-rise Construction (Residential Code)
– Envelope, Air-sealing, Mechanical
• Mid-rise Construction (Commercial Code)
– Envelope, Air-sealing, Mechanical, Electrical,
Extras
© 2011 Steven Winter Associates, Inc. All rights reserved
2
2009 versus 2012 IECC
• Some aspects of 2012 have been relaxed
• Opportunities exist to cost-effectively
implement aspects of 2012
• The 2012 is ~ 10-15% more efficient than 2009
• The 2012 is ~ 30% more efficient than 2006
© 2011 Steven Winter Associates, Inc. All rights reserved
3
2009 versus 2012 IECC
Reading the Code
Residential Chapter
Commercial Chapter
2009 IECC
Chapter 4
Chapter 5
2012 IECC
Chapter R4
Chapter C4
• Must read chapter by hierarchy
– Understand each section by its context
– Like finding the best “grape” of knowledge
© 2011 Steven Winter Associates, Inc. All rights reserved
4
2009 versus 2012 IECC
Reading the Code
Section 401: Intro
Section 405
Section 402
Section 404
Section 403
402.1
402.4
402.2
402.3
© 2011 Steven Winter Associates, Inc. All rights reserved
402.4.1 Building Thermal Envelope: Air-sealing
5
2009 versus 2012 IECC
• Two Generic Compliance Methods to either
code
Mandatory Residential Measures
OR
Prescriptive Pathway
© 2011 Steven Winter Associates, Inc. All rights reserved
Performance Pathway
6
2009 versus 2012 IECC
• Two Generic Compliance Methods to either
code
Mandatory Residential Measures
Prescriptive Pathway
Performance Pathway
Envelopes
Prescriptive By Component
Performance By Component
UA- Alternative
© 2011 Steven Winter Associates, Inc. All rights reserved
7
2009 versus 2012 IECC
• Low-Rise, Wood-Framed Construction
– Envelopes: Prescriptive by Measure
Climate Zone 4, 3 Stories and Under, Wood Frame by Component
(Table 402.1.1 - 2009 IECC, Page 27; Table R402.1.1 - 2012 IECC, Page R-29)
Window Skylights
U-value U-value
2009 IECC
2012 IECC
0.35
0.35
0.60
0.55
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Wood
Ceiling
Mass Wall
Frame Wall
R-value
R-value
R-value
38
13
5/10
49
20 or 13+5
8/13
Floor
R-value
19
19
Basement Crawlspace
Wall R-value
R-value
10/13
10/13
10/13
10/13
8
2009 versus 2012 IECC
• Low-Rise, Wood-Framed Construction
– Envelopes: Performance by Measure
Climate Zone 4, 3 Stories and Under, Wood Frame by Assembly
(Table 402.1.3 - 2009 IECC, Page 28; Table R402.1.3 - 2012 IECC, Page R-30)
Window Skylights
U-value U-value
2009 IECC
2012 IECC
0.35
0.35
0.60
0.55
© 2011 Steven Winter Associates, Inc. All rights reserved
Wood
Ceiling
Mass Wall
Frame Wall
U-value
U-value
U-value
0.030
0.026
0.082
0.057
0.141
0.098
Floor
U-value
0.047
0.047
Basement Crawlspace
Wall U-value U-value
0.059
0.059
0.065
0.065
9
2009 versus 2012 IECC
• Low-Rise, Wood-Framed Construction
– Envelopes: Performance by Measure
Window Skylights
U-value U-value
2009 IECC
2012 IECC
0.35
0.35
0.60
0.55
Wood
Ceiling
Mass Wall
Frame Wall
U-value
U-value
U-value
0.030
0.026
0.082
0.057
0.141
0.098
Floor
U-value
0.047
0.047
Basement Crawlspace
Wall R-value
R-value
0.059
0.059
0.065
0.065
If already using blown ceiling insulation
and roof/ ceiling trusses are 24” O.C.,
then the project is nearly meeting this
requirement. Only ½” extra needed.
© 2011 Steven Winter Associates, Inc. All rights reserved
10
2009 versus 2012 IECC
• Low-Rise, Wood-Framed Construction
– Envelopes: UA Alternative Compliance
– Can exceed insulation on a component to tradeoff for another
– Example: 1000 Sqft House, over crawlspace
Component
Walls
Ceiling
Floor
Windows
Proposed
R-13
R-60
R-30
U-0.31
2012 IECC Surface Area
R-20
1040
R-48
1000
R-19
1000
U-0.35
150
Component Proposed UA
Walls
85
Ceiling
17
Floor
35
Windows
47
Total
© 2011 Steven Winter Associates, Inc. All rights reserved
183
Code UA
59
26
47
53
185
11
2009 versus 2012 IECC
• Two Generic Compliance Methods to either
code
Mandatory Residential Measures
OR
Prescriptive Pathway
© 2011 Steven Winter Associates, Inc. All rights reserved
Performance Pathway
12
2009 versus 2012 IECC
• Low-Rise, Wood-Framed Construction
– Performance “Whole” building: Includes heating,
cooling, and hot water LOADS.
– HVAC efficiencies do not improve performance
approach results
– Variety of available energy models: commercial
and public
• RESCheck (free)
• EnergyGauge
• REMRate
© 2011 Steven Winter Associates, Inc. All rights reserved
13
2009 versus 2012 IECC
• Air-sealing
Mandatory Residential Measures
Air-sealing
Prescriptive Pathway
Performance Pathway
Envelopes
Mandatory
Items
Testing
Prescriptive By Component
Performance By Component
UA- Alternative
© 2011 Steven Winter Associates, Inc. All rights reserved
14
2009 versus 2012 IECC
• Locations for Air-Sealing:
– Any two separate materials at boundary
conditions have gaps that will leak air
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15
2009 versus 2012 IECC
• Air-sealing differences
Component
Air-barrier
2009 IECC
Air-permeable Insulation is on inside of air-barrier
2012 IECC
Deleted
Exterior thermal envelope insulation for framed walls shall
Walls
N/A
be installed in substantial contact with the air-barrier.
Walls
N/A
Knee-walls sealed
Windows, Skylights and Doors
Does not require Skylights be Air-sealed
Does require skylights be air-sealed
Common Wall
Air barrier is installed in common wall between dwelling
Deleted
units
Fireplaces
Air-barriers at fireplaces
Air-barriers at fireplaces and gasketed doors
Infiltration Requirements
Component
Verification
Target Infiltration Rates
2009 IECC
Visual inspection or testing allowed
7 ACH @ 50 Pascal
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2012 IECC
Testing required, but code official determines whether a
third party will be involved
3 ACH @ 50 Pascal
16
2009 versus 2012 IECC
• Air-sealing testing methodology, standard
home
Negative Pressure
© 2011 Steven Winter Associates, Inc. All rights reserved
17
2009 versus 2012 IECC
• Air-sealing testing methodology
© 2011 Steven Winter Associates, Inc. All rights reserved
18
2009 versus 2012 IECC
• Air-sealing testing methodology, multifamily
home
Negative Pressure
© 2011 Steven Winter Associates, Inc. All rights reserved
19
2009 versus 2012 IECC
• Air-sealing methods
© 2011 Steven Winter Associates, Inc. All rights reserved
20
2009 versus 2012 IECC
• Air-sealing methods
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21
2009 versus 2012 IECC
• Mechanical Measures
Mandatory Residential Measures
Air-sealing
Prescriptive Pathway
Performance Pathway
Mechanical
Envelopes
Mandatory
Items
Testing
Prescriptive By Component
Performance By Component
UA- Alternative
© 2011 Steven Winter Associates, Inc. All rights reserved
Piping
Duct Leakage
Air-Handler Leakage
22
2009 versus 2012 IECC
• Mechanical Measures
Component
HVAC Pipe Insulation
Exposed Pipe Insulation
Circulating Systems
Hot Water Pipe Insulation
2009 IECC
R-3 on pipes >105◦ or <55◦
N/A
R-2 and accessable on/off switch
N/A
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2012 IECC
R-3 on pipes >105◦ or <55◦
Protected from sun, wind, rain: no adhesive tape allowed
R-3 and accessable on/off switch
R-3
23
2009 versus 2012 IECC
• Mechanical Measures
Duct Leakage Requirements
Component
Filter Boxes
Leakage to the outdoors
Total Duct Leakage
Exemption to Duct Leakage
Sealed Air-handler
2009 IECC
Required to be air-sealed
8 CFM/ 100 ft2 at 25 Pa OR Total Duct leakage
6CFM/100 ft2 at 25 Pa (w/ AHU) or 4 CFM50 w/out AHU
Not required if all ducts are in thermal envelope
N/A
© 2011 Steven Winter Associates, Inc. All rights reserved
2012 IECC
Required to be air-sealed
N/A
4CFM/100 ft2 at 25 Pa (w/ AHU) or 3 CFM50 w/out AHU
Not required if all ducts are in thermal envelope
Manufacturer designation that air-leakage <2% design flow
24
2009 versus 2012 IECC
• Mechanical Measures, Duct Leakage
© 2011 Steven Winter Associates, Inc. All rights reserved
25
2009 versus 2012 IECC
• Lighting
Component
Lighting
2009 IECC
50% of the permanently installed fixtures have high
efficiency lamps
2012 IECC
75% of the permanently installed fixtures have high
efficiency lamps
• High Efficiency = CFLs or
– 60 lumens per watt for lamps over 40 watts
– 50 lumens per watt for lamps btwn 15-40 watts
– 40 lumens per watt for lamps btwn <15 watts
© 2011 Steven Winter Associates, Inc. All rights reserved
26
2009 versus 2012 IECC
Commercial Code (4 Stories and Taller)
© 2011 Steven Winter Associates, Inc. All rights reserved
27
2009 versus 2012 IECC
• Code Organization
Mandatory Commercial Measures
Lights
OR
Air-sealing
Prescriptive
© 2011 Steven Winter Associates, Inc. All rights reserved
Performance
Additional Efficiency
Mechanical
28
2009 versus 2012 IECC
• Envelopes
Mandatory Commercial Measures
Lights
Air-sealing
Prescriptive
Performance
Additional Efficiency
Mechanical
Envelopes
Prescriptive By Component
Performance By Component
UA- Alternative
© 2011 Steven Winter Associates, Inc. All rights reserved
29
2009 versus 2012 IECC
• Envelopes
© 2011 Steven Winter Associates, Inc. All rights reserved
30
2009 versus 2012 IECC
• Air-sealing
Mandatory Commercial Measures
Lights
Air-sealing
Prescriptive
Performance
Additional Efficiency
Mechanical
Envelopes
Prescriptive By Component
Performance By Component
UA- Alternative
© 2011 Steven Winter Associates, Inc. All rights reserved
31
2009 versus 2012 IECC
• Air-sealing
© 2011 Steven Winter Associates, Inc. All rights reserved
32
2009 versus 2012 IECC
• Envelope
© 2011 Steven Winter Associates, Inc. All rights reserved
33
2009 versus 2012 IECC
• Mechanical Systems
Mandatory Commercial Measures
Lights
Air-sealing
Prescriptive
Performance
Envelopes
Prescriptive By Component
Additional Efficiency
Mechanical
Min HVAC Performance
Commissioning
Performance By Component
UA- Alternative
© 2011 Steven Winter Associates, Inc. All rights reserved
34
2009 versus 2012 IECC
• Mechanical Systems
© 2011 Steven Winter Associates, Inc. All rights reserved
35
2009 versus 2012 IECC
• Commissioning
© 2011 Steven Winter Associates, Inc. All rights reserved
36
2009 versus 2012 IECC
• Commissioning
© 2011 Steven Winter Associates, Inc. All rights reserved
37
2009 versus 2012 IECC
• Commissioning
© 2011 Steven Winter Associates, Inc. All rights reserved
38
2009 versus 2012 IECC
• Lighting
Mandatory Commercial Measures
Lights
Air-sealing
Prescriptive
Performance
Envelopes
Prescriptive By Component
Additional Efficiency
Mechanical
Min HVAC Performance
Commissioning
Performance By Component
UA- Alternative
© 2011 Steven Winter Associates, Inc. All rights reserved
39
2009 versus 2012 IECC
• Lighting
© 2011 Steven Winter Associates, Inc. All rights reserved
40
2009 versus 2012 IECC
• Lighting
– “Bulbs” not Fixtures
– Hole in 2009 allowed exterior lighting to be
irrelevant for high-rise buildings
© 2011 Steven Winter Associates, Inc. All rights reserved
41
2009 versus 2012 IECC
• Lighting
Mandatory Commercial Measures
Lights
Air-sealing
Prescriptive
Performance
Envelopes
Prescriptive By Component
Additional Efficiency
Mechanical
Min HVAC Performance
Commissioning
Performance By Component
Performance HVAC
UA- Alternative
Performance Lighting
Renewables
© 2011 Steven Winter Associates, Inc. All rights reserved
42
2009 versus 2012 IECC
• Additional Efficiency – Performance HVAC
OR
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43
2009 versus 2012 IECC
• Additional Efficiency – Performance Lighting
OR
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44
2009 versus 2012 IECC
• Additional Efficiency – Performance Lighting
Building Component
Renewable Energy Watts
Renewable by Percent
2009 IECC
N/A
N/A
2012 IECC
0.5 Watts/sqft OR 1854 W
3% of MEP loads
• 2kW system costs about $11,000 before
rebates
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45
2009 versus 2012 IECC
Questions?
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46
