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Thermal Bypass Checklist - Identifying and Addressing Thermal Bypass Points

Learn about thermal bypass and how to identify and address common thermal bypass points in homes. This comprehensive checklist covers insulation alignment, doors to unconditioned spaces, slab edge insulation, walls adjoining unconditioned spaces, cantilevered floors, flue shafts, and fireplace shaft walls.

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Thermal Bypass Checklist - Identifying and Addressing Thermal Bypass Points

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  1. Thermal Bypass Checklist Round-Table

  2. WHAT IS THERMAL BYPASS? 30o F 50o F 70o F 70o F

  3. WHAT THERMAL BYPASS LOOKS LIKE

  4. GENERAL • Builder not required to sign checklist if he/she has not verified any items. • Maximum of four items allowed for builder refers to numbered items, not bullets.

  5. THERMAL BYPASS CHECKLIST: 1. INSULATION ALIGNMENT Insulated sloped ceilings: Air barrier required except if closed cell spray foam

  6. THERMAL BYPASS CHECKLIST: 1. INSULATION ALIGNMENT Doors to unconditioned spaces shall meet IECC insulation requirements for exterior doors and include full weatherstripping.

  7. THERMAL BYPASS CHECKLIST:1. INSULATION ALIGNMENT Slab Edge Insulation: (Climate Zones 4 and higher) Plan for Flooring!!! Exterior Interior

  8. THERMAL BYPASS CHECKLIST:1. INSULATION ALIGNMENT Band Joists: Highly encourage, but don’t require complete air barrier detail except: • Garage/House Interface (Item #1) • Cantilevered Floor (Item #6) • Porch Roof (Item #12)

  9. THERMAL BYPASS CHECKLIST:2. SHOWER/TUB EXTERIOR WALL

  10. THERMAL BYPASS CHECKLIST: 3. INSULATED FLOOR OVER GARAGE Improper insulation! It must touch the surface it is intended to insulate. Critical to check for air gap!

  11. THERMAL BYPASS CHECKLIST:4. WALLS ADJOINING UNCOND. SPACES Key Areas: • Attic Knee Walls • Double Walls • Skylight Shafts • Porches (TBC # 14)

  12. Air Barrier THERMAL BYPASS CHECKLIST:4. WALLS ADJOINING UNCOND. SPACES Double Walls Heat

  13. THERMAL BYPASS CHECKLIST:4. WALLS ADJOINING UNCOND. SPACES Courtesy of Consol

  14. THERMAL BYPASS CHECKLIST:4. WALLS ADJOINING UNCOND. SPACES Courtesy of Consol

  15. THERMAL BYPASS CHECKLIST:4. WALLS ADJOINING UNCOND. SPACES Courtesy of Consol

  16. THERMAL BYPASS CHECKLIST: 4. WALLS ADJOINING UNCOND. SPACES Skylight Shaft Skylight Attic Air Barrier Air Barrier Insulation

  17. THERMAL BYPASS CHECKLIST:4. WALLS ADJOINING UNCOND. SPACES Tubular Skylight 14” Exposed area = ~30 sq.ft. Need insulation and air barrier 1.2’ diamater x 3.1412 x 8’ = 30 sq. ft. exposed surface area’

  18. Add Blocking Fill with Insulation Thermal Bypass Thermal Bypass Seal Edges THERMAL BYPASS CHECKLIST:6. CANTILEVERED FLOOR Tips: Consider spray foam insulation installed to desired thickness because it can serve as both insulation and an air barrier. Critical to check air gap at floor.

  19. THERMAL BYPASS CHECKLIST:8. FLUE SHAFT TIP: Specially colored fire-rated foam now available for sealing difficult air gaps at flue openings Image courtesy of EnergyLogic Image courtesy of EnergyLogic

  20. THERMAL BYPASS CHECKLIST: 11. FIREPLACE SHAFT WALL

  21. WRAP-UP Any other concerns?

  22. ANSWER... One more thought… “It wasn’t raining when Noah built the Ark.” Howard Duff

  23. HOW TO GET MORE INFORMATION On the Web at: http://www.energystar.gov/homes

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