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at Plain Green 2009

at Plain Green 2009

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  • 1. ENERGY STAR Qualified Homes THERMAL BYPASS CHECKLIST GUIDE Version 2.1 Updated June 2008 1
  • 2. Heat flow Air flow Insulation Air barrier Heat flow Air flow Insulation 2
  • 3. 3
  • 4. Image courtesy of Environments for Living 4
  • 5. No gaps at ends Gap between garage and conditioned space due to incomplete blocking 5
  • 6. 6
  • 7. Image courtesy of MaGrann Associates 7
  • 8. 8
  • 9. 9
  • 10. Diagrams courtesy of the US Department of Energy 10
  • 11. 11
  • 12. MINIMIZE THERMAL BRIDGING Optimal Value Engineering (OVE) “California Corners” that use two instead of three studs to frame corners Single top plates instead of double plates 24” on center studding instead of 16” on center framing Continuous insulation in stead of cavity filled insulation Reducing or eliminating thermal bridging 12
  • 13. Complete thermal break with rigid insulation sheathing 13
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  • 24. Unvented attic with spray foam insulation at slopes and walls 24
  • 25. 25
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  • 27. 27
  • 28. 28
  • 29. 29
  • 30. 30
  • 31. 31
  • 32. 32
  • 33. Staircase adjoining unconditioned attic needs to be fully blocked and sealed 33
  • 34. Interior air barrier Interior air barrier Exterior boundary Exterior air barrier Interior wall with insulation The interior wall with Double wall area filled with exterior air barrier insulation Double wall with air Double wall with filled cavity 34
  • 35. Thermal Bypass Floor Garage ceiling Thermal bypass at garage ceiling Floor Air barrier Garage ceiling Alignment of insulation and air barrier at garage ceiling Floor Air barrier if batts Spray-foam or faced are used batt insulation Garage ceiling Alignment of insulation and air barrier at garage ceiling with spray foam or faced batt insulation 35
  • 36. Architectural detail for cantilevered floor assembly Proper installation of insulation under a cantilevered floor 36
  • 37. 37
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  • 43. Infrared images of thermal bypass at attic access panels Gasket 43
  • 44. Infrared images of thermal bypass at attic drop-down stair 44
  • 45. Architectural detail illustrates proper air barrier assembly at dropped ceiling Images courtesy of Energy Services Group 45
  • 46. Infrared image of thermal bypass at non-rated recessed Infrared image of thermal bypass at IC recessed lighting lighting fixture fixture 46
  • 47. Air seal here Framed wall Drywall Air seal here Architectural detail of air sealing at common wall Example of properly air sealed common wall with fire-rated caulking (in red) 47
  • 48. 48