energy code compliance with sips · energy code compliance with sips frank baker, pfb corporation...
TRANSCRIPT
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Energy Code Compliance With SIPs
Frank Baker, PFB Corporation
Don Ferrier, Ferrier Custom Homes
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Slide 2
Outline
• Overview of 2009 and 2012 energy codes
• Code compliance with SIPs
• Reducing air infiltration with SIP construction
• Side-by-side case studies
• Sealing methods
• Cost comparison from a builder’s perspective
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Slide 3
Trending Towards Efficiency
• 2012 IECC 30% more efficient than 2006 IECC
• ENERGY STAR v3 in effect Jan 1, 2012
• Advocates pushing for 70% – 100% by 2030 – DOE: affordable net zero energy homes by 2030
– 2030 Challenge: carbon neutral by 2030
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Slide 4
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Slide 5
2009 IECC
• On average, 12% increase over 2006
• Save homeowners $235/yr at current energy prices
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Slide 6
2009 IECC
• More efficient windows and doors
• Increased insulation
• Visual inspection of thermal envelope OR blower door test
• Duct leakage testing
• Thermal enclosure inspection
• No mechanical trade offs under performance path
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Slide 7
2009 IECC
Air Infiltration – 7 ACH50 all climate zones
– OR visual inspection
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Slide 8
Climate Zones
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Slide 9
2009 IECC
Prescriptive requirements: insulation + windows
CLIMATE ZONE
FENESTRATION U-FACTOR
SKYLIGHT U-FACTOR
GLAZED FENESTRATION
SHGC CEILING R-VALUE
WOOD FRAME WALL R-VALUE
MASS WALL R-VALUE1
FLOOR R-VALUE
BASEMENT WALL R-VALUE2
SLAB R-VALUE & DEPTH
CRAWL SPACE
WALL R-VALUE2
1 1.2 0.75 0.3 30 13 3/4 13 0 0 0
2 0.65 0.75 0.3 30 13 4/6 13 0 0 0
3 0.5 0.65 0.3 30 13 5/8 19 5/13 0 5/13
4 except Marine 0.35 0.6 NR 38 13 5/10 19 10/13 10, 2 ft 10/13
5 and Marine 4 0.35 0.6 NR 38 20 or 13+5 13/17 30 10/13 10, 2 ft 10/13
6 0.35 0.6 NR 49 20 or 13+5 15/19 30 15/19 10, 4 ft 10/13
7 and 8 0.35 0.6 NR 49 21 19/21 38 15/19 10, 4 ft 10/13
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Slide 10
2012 IECC
• Even more efficient windows
• Even more insulation
• Blower door test REQUIRED
• Duct insulation
• Less duct leakage allowed
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Slide 11
2012 IECC
Air infiltration – 5 ACH50 in climate zones 1-2
– 3 ACH50 in climate zones 3-8
– AND visual inspection
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Slide 12
2012 IECC
Prescriptive requirements: insulation + windows
CLIMATE ZONE
FENESTRATION U-FACTOR
SKYLIGHT U-FACTOR
GLAZED FENESTRATION
SHGC CEILING R-VALUE
WOOD FRAME WALL R-VALUE
MASS WALL R-VALUE1
FLOOR R-VALUE
BASEMENT WALL R-VALUE2
SLAB R-VALUE & DEPTH
CRAWL SPACE
WALL R-VALUE2
1 0.65 0.75 0.25 30 13 3/4 13 0 0 0
2 0.4 0.65 0.25 38 13 4/6 13 0 0 0
3 0.35 0.55 0.25 38 20 or 13+5 5/8 19 5/13 0 5/13
4 except Marine 0.35 0.55 0.4 49 20 or 13+5 5/10 19 10/13 10, 2 ft 10/13
5 and Marine 4 0.32 0.55 NR 49 20 or 13+5 13/17 30 15/19 10, 2 ft 15/19
6 0.32 0.55 NR 49 20+5 or 13+10 15/19 30 15/19 10, 4 ft 15/19
7 and 8 0.32 0.55 NR 49 20+5 or 13+10 19/21 30 15/19 10, 4 ft 15/19
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Slide 13
ENERGY STAR v3
• Insulation at 2009 IECC levels
• Advanced framing or exterior insulation
• Sealed top plates and drywall
• Additional visual inspection checklists
• Easy to meet thermal enclosure requirements with SIPs
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Slide 14
Builders Challenge
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Slide 15
Advantages of Building with SIPs
More cost competitive at higher levels of energy efficiency:
• Continuous insulation • Near perfect air sealing • Labor savings • Quality Control • Seismic
• Hurricane resistance • Long term durability • Life cycle analysis • Better IAQ • Smaller HVAC • Occupant comfort
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Slide 16
SIPs: Energy Efficiency
• Continuous insulation
• No thermal bridging
• Total UA alternative method accounts for thermal bridging
• Performance method
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Slide 17
Code Compliance
Climate Zone EPS SIPs PU SIPs
1-4 4” 4”
5-8 6” 4”
Prescriptive - 2009 IECC Walls Total UA Alternative
Prescriptive - 2009 IECC Roofs Total UA Alternative
Climate Zone EPS SIPs PU SIPs
1-3 8”/10" 6”
4-5 10” 8”
6-8 12” 8”
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Slide 18
Code Compliance
Climate Zone EPS SIPs PU SIPs
1-2 4” 4”
3-5 6” 4”
6-8 6”/8” 4”/6”
Prescriptive - 2012 IECC Walls Total UA Alternative
Prescriptive - 2012 IECC Roofs Total UA Alternative
Climate Zone EPS SIPs PU SIPs
1-3 10” 6”
4-8 12” 8”
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Slide 19
Code Compliance
Performance method – Whole-house energy modeling
– Sometimes thinner panels possible
– Accounts for air infiltration
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Slide 20
Continuous Insulated Panels
• Meets code requirements for exterior insulation over conventional wood frame walls
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Slide 21
Thermal Bridging
Stick SIP
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Slide 22
Air Infiltration
• Air infiltration part of performance method calculation
• Responsible for 30 – 50% of heating and cooling loss
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Slide 23
SIPs: Air Infiltration
ORNL test room – SIPs vs fiberglass
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Slide 24
SIPs: Air Infiltration
Burnside’s Inn
• 0.86 ACH50
• HERS 37
• EVHA Winner
• ICF lower level
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Slide 25
SIPs: Air Infiltration
Passive House DC
• 0.6 ACH50
• HERS 37
• Certified Passive House
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Slide 26
SIPs: Air Infiltration
Zero Energy Casita • 0.54 ACH50 • HERS 33 • LEED Platinum, Green Built Texas, Builders Challenge certified, National Green Building Standard Emerald
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Slide 27
SIPs: Air Infiltration
Ballard Zero Energy House
• 0.56 ACH50
• HERS -1
• Net zero energy
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Slide 28
ZEBRAlliance Research Homes
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Slide 29
ZEBRAlliance Research Homes
Walls – 2x6, 15% framing factor, flash & batt – ½” spray
foam + R-19 fiberglass batts
– 6” SIP with EPS core
Attic – R-35 cathedral (SIPs 10-in)
– R-50 cathedral (aged phenolic) 2x12, 24” o.c.
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Slide 30
ZEBRAlliance Research Homes
1.23
0.74
0
0.2
0.4
0.6
0.8
1
1.2
1.4
ZEBRA Flash & Batt ZEBRA SIP
Blower Door Test Results (ACH50)
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Slide 31
ZEBRAlliance Research Homes
Summary
– SIPs saved 21% more space heating energy than OVF
– SIPs home HERS 46, OVF home HERS 48
• SIPs attained 40% greater air tightness than OVF even though it was the framing crew’s first SIP job
• Crew went to SIPschool, then built same house with OVF
– SIPS envelope went up in only 5 days compared to 15 for the OVF
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Slide 32
ZEBRAlliance Research Homes
Why the large difference in performance? – Air leakage
– Thermal bridging
– FTC R-Value myth, is it really R-19?
– ASTM Guarded Hot Box vs Whole Wall R-Value. • 75F test temp vs real world.
• Tightly sealed box not a wall.
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Slide 33
Foam vs Fuzz
• Fiberglass and other types of fibrous insulation performance decreases as the Delta T increases.
• Foam insulation performance increases as the Delta T increases. EPS at 75F is 3.85, at 25 is 4.25. Over 10% increase.
• Yet the FTC labeling is fixed to the 75F standard.
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Slide 34
SIPs: Labor Savings
• Independent R.S. Means study shows 55% labor savings over stick frame in residential construction with prefabricated SIPs
• 11% savings on electrical rough-in
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Slide 35
SIPs: Labor Savings
• Timber Framing, March, 2012
• Second response to article “Are SIPs Necessary,” March, 2011
• Available at www.tfguild.org
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Slide 36
Cost Savings
• Faster dry-in time
• Easier trim installation
• Faster sheetrock – less cutting
• Waste disposal
• Shortened duct runs
• Smaller HVAC
• Less skilled labor needed
• Overhead/construction loan
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Slide 37
Wall Systems Study
• Practical Residential Wall Systems: R-30 and Beyond
• Robb A. Aldrich, Lois Arena, William Zoeller of Steven Winter Associates, Inc.
• Examine double wall, foam sheathing, SIPs for R-30 wall construction
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Slide 38
Wall Systems Study
Nominal R-Value Whole Wall R-Value
Incremental Cost
Base 2x6 R-20 R-17 $0
12” Double wall R-44 R-42 $1,888
2x4 + 4” ext. insulation
R-33 R-33 $3,375
8” EPS SIP R-31 R-28 $1,458
10” EPS SIP R-39 R-36 $2,258
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Slide 39
Wall Systems Study
$0
$500
$1,000
$1,500
$2,000
$2,500
$3,000
$3,500
$4,000
12" Double Wall 2x4 + 4" Ext. Insulation
8" EPS SIP 10" EPS SIP
R-30 Wall Systems Cost
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Building with SIPs
Don Ferrier, Ferrier Custom Homes
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Slide 41
Introduction
Ferrier Custom Homes
• 8 time EVHA Winner
• NAHB Green Builder Advocate of the Year
• Texas Green Builder Advocate of the Year
• NAHB Green Building & Energy Subcommittees
• 1st LEED Platinum Home in Texas- 3rd in Nation
• Numerous Local & Regional Awards
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Slide 42
Our Clients
Two Basic Clients – Retiring Baby Boomers
• Willing to invest to realize long-term savings
– Young Professionals • Right “green” thing to do
• Secondary desire to save on energy costs
SIP’s have been an integral part of meeting the demands of these two groups
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Slide 43
SIPs: Sealing for Air Tightness
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Slide 44
SIPs: Sealing for Air Tightness
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Slide 45
SIPs: Sealing for Air Tightness
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Slide 46
SIPs: Sealing for Air Tightness
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Slide 47
SIPs: Sealing for Air Tightness
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Slide 48
SIPs: Sealing for Air Tightness
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Slide 49
SIPs: Sealing for Air Tightness
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Slide 50
SIPs: Flashing for Air Tightness
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Slide 51
SIPs: Sealing for Air Tightness
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Slide 52
SIPs: Sealing for Air Tightness
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Slide 53
SIPs: Sealing for Air Tightness
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Slide 54
Building Science Corp. Comparisons
Thickness R-Value Payback Period
4.5” 15 Base
6.5” 23 7 Years
Heather’s Home – Fort Worth, Texas SIP Walls
SIP Roof
Thickness R-Value Payback Period
6.5” 23 Base
8.25” 30 3.1 Years
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Slide 55
Clifton View Homes Cost Study
Zero Energy Plans, LLC/Clifton View Homes
• 4 time EVHA winner
• 2 time National Green Building Award winner
• 2011 EVHA Remodeler of the Year
• 2,000 sq. ft. 2-story home
• Climate zone Marine 4
• 15% glazing area
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Slide 56
Clifton View Homes Cost Study
• 2009 code requirements for Marine 4 climate zone: – Walls: R-20 or R-13+R-5 insulated sheathing
– Roof: R-38
• 2012 code requirements: – Walls: R-20+5 or R-13+R-10
– Roof: R-49
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Slide 57
Clifton View Homes Cost Study
Assemblies: – 2x6 advanced framing 24” o.c., R-21 fiberglass
batts, R-38 attic
– 2x6 advanced framing 24” o.c., R-21 fiberglass batts, R-5 insulated sheathing, R-49 attic
– 2x6 advanced framing 24” o.c., closed cell SPF walls and roof
– 6” SIP wall, 10” SIP roof, EPS core
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Slide 58
Clifton View Homes Cost Study
2009 IECC 2012 IECC
2x6 24” o.c. $18,100 $21,047
SIPs $25,910 $25,910
Cost difference $7,810 $4,863
SIPs vs Fiberglass Walls
2009 IECC 2012 IECC
2x6 24” o.c. , SPF $27,616 $27,616
SIPs $25,910 $25,910
Cost difference $-1,706 $-1,706
SIPs vs Spray Foam Walls
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Slide 59
Clifton View Homes Cost Study
$0
$5,000
$10,000
$15,000
$20,000
$25,000
$30,000
2009 IECC Wood Frame
2012 IECC Wood Frame
SIPs 2x6 SPF
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Slide 60
Clifton View Homes Cost Study
“Because the SIPS are consistent in quality, easy to assemble, deliver predictable results, reduce construction time and waste, and eliminate worries about wall-cavity related moisture issues, I believe the SIPs are by far the better way to build a house.”
― Ted Clifton, Zero Energy Plans/Clifton View Homes
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Slide 61
J. Barrows, Inc. Cost Comparison
United Way- Patton St.
United Way- Clark St.
Custom Homes- Contemporary
Custom Home- Addition
SF 1,620 1,620 3,153 3,911
Conv Frame $ 62,370 $ 51,870 $ 93,815 $ 86,308
Air Seal/Insul $ 14,730 $ 13,417 $ 30,010 $ 28,366
Cost $ 77,100 $ 65,287 $ 123,825 $ 114,673
Cost/SF $ 47.59 $ 40.30 $ 39.27 $ 29.32
SIPS Envelope $ 66,595 $ 54,469 $ 111,476 $ 113,026
8” walls 12” roof
6” walls 10” roof
6” walls 10” roof
6” walls 10” roof
Cost/SF $ 41.11 $ 33.62 $ 35.36 $ 28.90
New York State - Courtesy of John Barrows
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Slide 62
J. Barrows, Inc. Cost Comparison
$0
$20,000
$40,000
$60,000
$80,000
$100,000
$120,000
$140,000
United Way Patton St.
United Way Clark St.
Custom Home Contemporary
Custom Home Addition
Wood Frame
SIPs
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Slide 63
J. Barrows, Inc. Cost Comparison
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Presentation and Supporting Documents Available at
www.sips.org/ibs