Thermal Bypass Checklist: How We Got There?
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1 NORTH CAROLINA ENERGY STAR CONFERENCE NOVEMBER 16, 2007 Thermal Bypass Checklist: Lessons Learned
2 Thermal Bypass Checklist: How We Got There?
3 ENERGY STAR FOR HOMES OLD SPEC Tight Air Advanced d Efficient i Field Ducts Sealing Windows Equipment Verified
4 ENERGY STAR FOR HOMES NEW SPEC Insulation Installation ti Thermal Bypass Right Sizing
5 NEW SPEC: TRULY ENERGY EFFICIENT AEC Study: ~7,000 homes (1998 and 2004) ~3,300 baseline (est. 20% > MEC 93) ~3,000 ENERGY STAR Qualified Homes ~800 Guaranteed Performance Homes 16% 33% ENERGY STAR 2 x 6 Guar. 24 o.c. Perform. Energy Savings Compared to Baseline Source: Measuring Public Benefit from Energy Efficient Homes [2005], Advanced Energy Corp.
6 NEW SPEC: COST-EFFECTIVE Monthly Annual Utility Savings $40 $480 Added Mortgage $15 $180 Cost Savings $25 $300 = $1,000 s for typical ownership period
7 Thermal Bypass Checklist: Link to Building Science
8 LINK TO BUILDING SCIENCE: KEY OBJECTIVES Control Air Flow Control Moisture Flow (Vapor, Bulk) High- Performance Homes Control Thermal Flow
9 LINK TO BUILDING SCIENCE DRIVING FORCES PREDICTABLE More Pressure Hot Moisture to Less Pressure Hot Moisture
10 LINK BUILDING SCIENCE ALL ACTION HAPPENS AT SURFACES Without Insulation: Potential No Problem!! Outside: Inside: 30 o F 70 o F, 45 0 F Dew Pt o F Warm Cold Surface Therefore, must control air leakage!!!
11
12 LINK BUILDING SCIENCE WHY CONTROL AIR FLOW? Courtesy of Building Science Corp.
13 LINK TO BUILDING SCIENCE TWO CONDITONS FOR AIR LEAKAGE Holes Driving Dii Forces air Air will take path of least Resistance through largest hole: So seal big holes first!
14 LINK TO BUILDING SCIENCE BIG HOLES Access Panels Ceiling fixtures Sill Plates Vents Door Openings Chases Dropped Ceiliings Window Openings Plumbing Penetrations Ducts
15 LINK TO BUILDING SCIENCE WHY WE CARE ABOUT THE BIG HOLES 4 x 8 Sheet of Gypsum Board Interior at 70 o F and 40% RH 1 in. sq. hole 30 quarts water vs. 1/3 quart water
16 AFFORDABILITY PROBLEMS: THERMAL BYPASS: CHIMNEY CHASE
17 AFFORDABILITY PROBLEMS: THERMAL BYPASS: DUCT CHASE
18 AFFORDABILITY PROBLEMS: THERMAL BYPASS: OPEN SOFFIT
19 LINK TO BUILDING SCIENCE WATCH FOR TRICKY HOLES
20
21
22 LINK TO BUILDING SCIENCE INSULATION IS NOT AN AIR BARRIER Resists Heat Flow Air Flow need Air Barrier any solid material that blocks air flow including sealing at edges and seams
23 LINK TO BUILDING SCIENCE AIR BARRIER EXPERIMENT
24 LINK TO BUILDING SCIENCE WHY COMPLETE AIR BARRIER 30 o F o F 30 o F 70 o F
25 LINK TO BUILDING SCIENCE WHY COMPLETE AIR BARRIER
26 LINK TO BUILDING SCIENCE EFFECTIVE THERMAL ENVELOPE Eliminate Holes Incomplete Air Barrier Complete Air Sealing Misalignment with Air Barrier Wind d Intrusion Complete Air Barrier Gaps Voids Compression Compression Properly Installed Insulation
27 LINK TO BUILDING SCIENCE PUTTING IT ALL TOGETHER: HOW Moisture Flow (vapor, bulk) Air Sealing Tight Ducts Complete C l t Air Barrier Moisture Control Right-Sized AC Spot/WH Ventilation Air Flow Air Sealing Tight Ducts Complete Air Barrier Pressure Balancing High- Performance Homes Thermal Flow Air Sealing Tight Ducts Complete Air Barrier Proper Insulation Advanced Windows Internal Ducts Radiant Barriers Efficient Equipment
28 LINK TO BUILDING SCIENCE PUTTING IT ALL TOGETHER: WHY Performance Advantage: Lower Utility Cost Improve Comfort Improve IAQ Improve Durability Control Moisture Flow (Vapor, Bulk) Control Air Flow High- Performance Homes Cost Advantage: Cash-Flow Investment Return Resale Value Control Thermal Flow
29 LINK TO BUILDING SCIENCE: ENERGY STAR QUALIFIED HOMES Tight Ducts Air Sealing Advanced Windows Efficient Equipment Field Verified = Insulation Installation Complete Air Barrier Right Sizing
30 LINK TO BUILDING SCIENCE: ENERGY STAR INDOOR AIR PACKAGE Radon Control + + Moisture Control Pest Management = HVAC Systems Combustion Systems Materials INDOOR AIR PACKAGE
31 Thermal Bypass Checklist: Lessons Learned
32 Lesson Learned: Most homes only have 10to 12 applicable items
33 1. OVERALL AIR BARRIER AND THERMAL BARRIER ALILGNMENT
34 OVERALL AIR BARRIER AND THERMAL ALILGNMENT COMPLETE AIR BARRIER Continuous Full contact with insulation on six sides Fully enclose conditioned space Courtesy of Southface Institute
35 OVERALL AIR BARRIER AND THERMAL ALILGNMENT INSULATION INSTALLATION PROBLEM
36 OVERALL AIR BARRIER AND THERMAL ALILGNMENT INSULATION INSTALLATION PROBLEM
37 OVERALL AIR BARRIER AND THERMAL ALILGNMENT PROBLEM: INSET STAPLING
38 OVERALL AIR BARRIER AND THERMAL ALILGNMENT PROBLEM: INSET STAPLING
39
40 OVERALL AIR BARRIER AND THERMAL ALILGNMENT PROBLEM: POOR ALIGNMENT
41 OVERALL AIR BARRIER AND THERMAL ALILGNMENT INSULATION INSTALLATION PROBLEM No Slab Edge Insulation
42 Courtesy: Tremco Barrier Solutions, Inc.
43 OVERALL AIR BARRIER AND THERMAL ALILGNMENT BATT INSULATION Fiberglass
44 OVERALL AIR BARRIER AND THERMAL ALILGNMENT BLOWN-IN INSULATION
45 OVERALL AIR BARRIER AND THERMAL ALILGNMENT SPRAY FOAM
46 OVERALL AIR BARRIER AND THERMAL ALILGNMENT STRUCTURAL INSULATED PANELS (SIPs)
47 OVERALL AIR BARRIER AND THERMAL ALILGNMENT INSULATED CONCRETE FORMS (ICF) Insulated Concrete Forms (ICFs)
48 OVERALL AIR BARRIER AND THERMAL ALILGNMENT INSULATION PROBLEM
49 OVERALL AIR BARRIER AND THERMAL ALILGNMENT RIM JOIST PROBLEM Courtesy of Fort Collins Utilities
50 OVERALL AIR BARRIER AND THERMAL ALILGNMENT BAND JOIST BEST PRACTICES Spray Foam
51 OVERALL AIR BARRIER AND THERMAL ALILGNMENT BAND JOIST BEST PRACTICES SIP Panel
52 OVERALL AIR BARRIER AND THERMAL ALILGNMENT ATTIC EAVE PROBLEM
53 OVERALL AIR BARRIER AND THERMAL ALILGNMENT ATTIC EAVE SOLUTION baffle insulation wind-washwash
54 OVERALL AIR BARRIER AND THERMAL ALILGNMENT ATTIC EAVE SOLUTION Baffles at every bay Image courtesy of MaGrann Associates
55 OVERALL AIR BARRIER AND THERMAL ALILGNMENT EXCEPTION TO SIX-SIDED SIDED AIR BARRIER Source: David South Enviro-Seal Foam Insulation
56 2. WALLS ADJOINING EXTERIOR WALLS OR UNCONDITIONED SPACES
57 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES EXEMPTION FOR EXTERIOR WALLS Climate Zones 4-8 Climate Zones 1-3
58 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES BEHIND TUB INSULATION/AIR BARRIER
59 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES BEHIND TUB INSULATION/AIR BARRIER Courtesy of Building Science Corp.
60 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES TUB WITHOUT AIR BARRIER Bathtub on Exterior Wall w/o Air Barrier
61 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES TUB WITHOUT AIR BARRIER Courtesy of Fort Collins Utilities
62 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES SHOWER/TUB AT EXTERIOR WALL
63 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES BEHIND TUB: INSULATION/AIR BARRIER Courtesy of Building Science Corp.
64 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES ATTIC KNEE WALL PROBLEM: WINTER Courtesy of D.R. Wastchak
65 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES ATTIC KNEE WALL PROBLEM: SUMMER
66 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES AIR BARRIER: KNEE WALL Hot Wall Courtesy of Building Science Corp.
67 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES ATTIC KNEE WALLS Images courtesy of Energy Services Group
68 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES SKYLIGHT SHAFT Air Barrier Skylight Attic Air Barrier Insulation
69 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES SKYLIGHT SHAFT
70 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES TUBULAR SKYLIGHT Exception: Note required if does not meet manufacturer installation requirements 14 Exposed area = ~30 sq.ft. Need insulation and air barrier
71 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES FIREPLACE WALL PROBLEM Courtesy of EnergyLogic
72 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES FIREPLACE WALL PROBLEM
73 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES FIREPLACE WALL PROBLEM?
74 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES FIREPLACE PROBLEM Courtesy of Fort Collins Utilities
75 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES FIREPLACE SOLUTION Courtesy of Building Science Corp. Courtesy of IBACOS
76 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES PORCH ROOF
77 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES PORCH ROOF
78 WALLS ADJOINING EXTERIOR OR UNCONDITIONED SPACES PORCH ROOF
79 3. FLOORS BETWEEN CONDITIONED AND EXTERIOR SPACES
80 FLOORS BETWEEN CONDITIONED/UNCONDITIONED SPACES INSULATED FLOOR OVER GARAGE Conditioned Room Garage Ceiling Summer
81 FLOORS BETWEEN CONDITIONED/UNCONDITIONED SPACES INSULATED FLOOR OVER GARAGE Conditioned Room Garage Ceiling Winter
82 FLOORS BETWEEN CONDITIONED/UNCONDITIONED SPACES INSULATED FLOOR OVER GARAGE QA/QC Challenge!!! Conditioned Room Garage Ceiling Option 1: Fill framing space with insulation and blocking
83 FLOORS BETWEEN CONDITIONED/UNCONDITIONED SPACES INSULATED FLOOR OVER GARAGE Blocking at Footprint
84 FLOORS BETWEEN CONDITIONED/UNCONDITIONED SPACES INSULATED FLOOR OVER GARAGE Improper insulation! It must touch the surface it is intended to insulate
85
86
87 FLOORS BETWEEN CONDITIONED/UNCONDITIONED SPACES INSULATED FLOOR OVER GARAGE
88 Insulation gap with subfloor
89 FLOORS BETWEEN CONDITIONED/UNCONDITIONED SPACES INSULATED FLOOR OVER GARAGE Conditioned Room Garage Ceiling Option 2: Batt or Blown-in Insulation aligned with sub-floor Only acceptable until July 1, 2008
90 FLOORS BETWEEN CONDITIONED/UNCONDITIONED SPACES INSULATED FLOOR OVER GARAGE Conditioned Room Garage Ceiling Option 3: Spray foam
91 FLOORS BETWEEN CONDITIONED/UNCONDITIONED SPACES INSULATED FLOOR OVER GARAGE Conditioned Room Garage Ceiling Option 4: SIP Floor
92 FLOORS BETWEEN CONDITIONED/UNCONDITIONED SPACES THE PERFECT STORM Solution: align insulation add air barriers 140 o F Bonus Room Over Garage Thermal Bypass Bonus 120 o F Room 120 o F 100 o F Garage Thermal Bypass
93 FLOORS BETWEEN CONDITIONED/UNCONDITIONED SPACES BONUS ROOM SOLUTION
94 FLOORS BETWEEN CONDITIONED/UNCONDITIONED SPACES CANTILEVER FLOORS Solution: align insulation add air barriers Cantilever Thermal Bypass Thermal Bypass
95 FLOORS BETWEEN CONDITIONED/UNCONDITIONED SPACES CANTILEVERED FLOOR PROBLEM Courtesy of Fort Collins Utilities
96 FLOORS BETWEEN CONDITIONED/UNCONDITIONED SPACES CANTILEVERED FLOOR SOLUTION? Not a recommended solution!
97 FLOORS BETWEEN CONDITIONED/UNCONDITIONED SPACES CANTILEVERED FLOOR PROBLEM Courtesy of Advanced Energy
98 FLOORS BETWEEN CONDITIONED/UNCONDITIONED SPACES CANTILEVERED FLOOR PROBLEM
99 FLOORS BETWEEN CONDITIONED/UNCONDITIONED SPACES CANTILEVERED FLOOR SOLUTION Courtesy of Fort Collins Utilities
100 4. SHAFTS
101 SHAFTS PROBLEM Courtesy of Advanced Energy
102 SHAFTS PROBLEM Courtesy of Fort Collins Utilities
103
104 SHAFTS SOLUTION Courtesy of Advanced Energy
105 5. ATTIC/CEILING INTERFACE
106 ATTIC/CEILING INTERFACE NO AIR BARRIER AT DROPPED CEILING Courtesy of Building Science Corp.
107 ATTIC/CEILING INTERFACE DROPPED CEILING PROBLEM Courtesy of Maryland Energy Administration
108 ATTIC/CEILING INTERFACE DROPPED CEILING PROBLEM Courtesy of Advanced Energy
109 ATTIC/CEILING INTERFACE DROPPED CEILING PROBLEM
110 ATTIC/CEILING INTERFACE DROPPED CEILING SOLUTION Courtesy of Advanced Energy
111 ATTIC/CEILING INTERFACE DROPPED CEILING SOLUTION Courtesy of Building Science Corp.
112 ATTIC/CEILING INTERFACE ATTIC ACCESS STAIR PROBLEM Courtesy of Energy Innovators
113 ATTIC/CEILING INTERFACE ATTIC ACCESS STAIR SOLUTIONS
114 ATTIC/CEILING INTERFACE ATTIC ACCESS PANEL PROBLEM
115 ATTIC/CEILING INTERFACE ATTIC ACCESS PANEL SOLUTION Factory- installed weather- stripping
116 ATTIC/CEILING INTERFACE RECESSED LIGHTING PROBLEM Courtesy of Energy Services Group
117 ATTIC/CEILING INTERFACE RECESSED LIGHTING SOLUTIONS Eliminate this air leakage by locating fixtures inside the insulated envelope or using insulated can, air-tight (ICAT) fixtures.
118 ATTIC/CEILING INTERFACE RECESSED LIGHTING Unacceptable. Does not meet most codes because of multiple holes. Washington State Energy Code Approved. Still need to gasket or caulk at drywall.
119 Lesson Learned: Large variation in recessed can air tightness
120 6. COMMON WALLS BETWEEN DWELLING UNITS
121 COMMON WALLS BETWEEN DWELLINGT UNITS PROBLEM
122 COMMON WALLS BETWEEN DWELLINGT UNITS PROBLEM Courtesy of Energy Services Group
123 COMMON WALLS BETWEEN DWELLINGT UNITS PROBLEM Courtesy of Energy Services Group
124 COMMON WALLS BETWEEN DWELLINGT UNITS SOLUTION Air seal here Framed wall Drywall Courtesy of EnergyLogic Air seal here
125 COMMON WALLS BETWEEN DWELLINGT UNITS SOLUTION Courtesy of Energy Services Group
126 COMMON WALLS BETWEEN DWELLINGT UNITS SOLUTION Lesson Learned: Confirm preferred material acceptable to local l code official. Fireproof spray caulk with special color now available. Courtesy of MaGrann Associates
127 General Lessons Learned
128 LESSONS LEARNED: MOST SIGNIFICANT CHALLENGES Ceiling between conditioned room and garage Cantilevered floors Garage/conditioned house interface Solution: Advanced insulation products/systems
129 LESSONS LEARNED AREAS WITH LEAST CHALLENGE Shafts Staircase Walls
130 LESSONS LEARNED: REMOVE INSULATION TO INSPECT Sound insulation in place. Party wall properly p sealed. The wire hole is sealed, but the party wall isn t.
131 LESSONS LEARNED: LOOK FOR COMBINATIONS Plenty of caulk, but no air barrier at tub and no attic knee wall air barrier
132 LESSONS LEARNED: LOOK FOR COMBINATIONS Courtesy of Advanced Energy
133 LESSONS LEARNED: LOOK OUT FOR TRICKY DETAILS Kneewall Open to Attic Rafters
134 LESSONS LEARNED: LOOK OUT FOR TRICKY DETAILS Dropped Ceiling air barrier missing i
135 LESSONS LEARNED: LOOK OUT FOR TRICKY DETAILS Dropped Sloped Ceiling Missing Blocking
136 LESSONS LEARNED: LOTS OF WASTED CAULKING Caulk where not necessary = Wasted time and money.
137 HOW TO GET MORE INFORMATION On the Web at:
Feature Zone IECC 2009 IECC
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