Building enclosure design presentation 2
- 2. PERFECT WALL Source: Building Science Corporation
- 3. PERFECT WALL Source: Building Science Corporation
- 4. PERFECT WALL Source: Building Science Corporation
- 5. PERFECT WALL Source: Building Science Corporation
- 6. PERFECT WALL Source: Building Science Corporation
- 7. PERFECT WALL
- 9. INSULATION STRATEGIES Interior Insulation (wall) • Advantages • easier to install • Material costs low • Disadvantages • Allows dewpoint interior to weather barrier • May require fire separation from habitable space • Does not protect weather barrier from thermal movements • Thermal bridging at framing members reduces effective R-value
- 10. INSULATION STRATEGIES Interior Insulation (wall) • Product Types • Fiberglass batts (3.1 to 4.3/in) • Mineral wool (3.7 to 4.5/in) • Cotton batts (3.5/in) • Sprayed-in cellulose (3.6 to 3.8/in) • Sprayed-in fiberglass (3.7 to 4.2/in) • Closed cell spray foam (6/in) • Open cell spray foam (3.5/in)
- 11. INSULATION STRATEGIES Exterior Insulation (wall) • Advantages • Mitigates thermal bridging • Protects weather barrier from thermal movements • Pushes dewpoint exterior of weather barrier • Disadvantages • Installation requires more coordination • Higher material cost • Drying time of wall may lengthen depending on material choices
- 12. INSULATION STRATEGIES Exterior Insulation (wall) • Product Types • Extruded polystyrene (XPS) (4.5 to 5.0/in) • Expanded polystyrene (EPS) (3.6 to 4.0/in) • Polyisocyanurate (5.6/in) • Closed cell spray foam (6/in) • Mineral wool (3.7 to 4.5/in)
- 13. INSULATION STRATEGIES Split Insulation (wall) • Advantages • Mitigates thermal bridging • Protects weather barrier from most thermal movements • Sometimes cost effective • Disadvantages • Installation still requires more coordination • Drying time of wall may lengthen depending on material choices • Weather barrier material choices narrow • Dewpoint will reside in stud cavity….but for how long?
- 14. INSULATION STRATEGIES Interior Insulation (roof) • Advantages • Easier to install • Material costs low • Disadvantages • Allows dewpoint interior to roof membrane • Does not protect roof membrane from thermal movements and weathering • Susceptible to moisture during construction • Thermal bridging at fasteners reduces effective R- value mildly
- 15. INSULATION STRATEGIES Infrared Scan of EPDM Roof THERM model w/ fasteners thru all insulation THERM model w/ fasteners thru first layer of insulation
- 16. INSULATION STRATEGIES Exterior Insulation (roof) • Advantages • Mitigates thermal bridging • Protects roof membrane from thermal movements • Pushes dewpoint exterior of roof membrane • Quicker “dry-in” of building • Disadvantages • Installation requires more coordination • Insulation needs to be covered (pavers, ballast, vegetation, etc.) to protect from exposure
- 19. INSULATION STRATEGIES Figure source: Roxul
- 21. Why is CONTINUITY important? PORTLAND AIR INFILTRATION WATER VAPOR DIFFUSION 1” SQUARE HOLE 10000 1000 100 10 1 0.1 # GRAINS PER HOUR INTERIOR 68°F 50%RH EXTERIOR 41°F 80%RH SOURCE: WBDG
- 22. Why is CONTINUITY important? MIAMIAIR INFILTRATION INTERIOR 70°F 50%RH WATER VAPOR DIFFUSION 1” SQUARE HOLE EXTERIOR 91°F 56%RH 0.1 1 10 100 1000 10000 # GRAINS PER HOUR SOURCE: WBDG
- 23. Why is CONTINUITY important? Solve the air and water first……..then worry about insulation!
- 24. Case Study 1 – Exterior infiltration
- 25. Case Study 1 – Exterior infiltration
- 26. Case Study 1 – Exterior infiltration
- 27. Case Study 1 – Exterior infiltration
- 28. Case Study 1 – Exterior infiltration
- 29. Case Study 1 – Exterior infiltration
- 30. Case Study 1 – Exterior infiltration
- 31. Case Study – Exterior infiltration
- 32. Case Study 1 – Exterior infiltration
- 33. Case Study 2 – Interior infiltration • Case Study - Interior
- 34. Case Study 2 – Interior infiltration
- 35. Case Study 2 – Interior infiltration ???
- 36. Case Study 2 – Interior infiltration Temperature = 20°F Relative Humidity = 93% Vapor Pressure Force = 7.2psf Temperature = 70°F Relative Humidity = 53% Vapor Pressure Force = 15.7psf
- 37. Case Study 2 – Interior infiltration
- 38. Case Study 2 – Interior infiltration
- 39. Case Study 2 – Interior infiltration
- 40. Case Study 2 – Interior infiltration
- 41. Case Study 3 – Interior infiltration
- 42. Case Study 3 – Interior infiltration
- 43. Case Study 3 – Interior infiltration
- 44. Case Study 3 – Interior infiltration
- 45. Case Study 3 – Interior infiltration
- 46. Case Study 3 – Interior infiltration
- 47. Case Study 3 – Interior infiltration
- 48. Case Study 4 – Exterior infiltration
- 49. Case Study 4 – Exterior infiltration
- 50. Case Study 4 – Exterior infiltration
- 51. Case Study 4 – Exterior infiltration
- 52. Case Study 4 – Exterior infiltration
- 53. Case Study 4 – Exterior infiltration
- 54. Case Study 4 – Exterior infiltration
- 55. Case Study 4 – Exterior infiltration
- 56. Case Study 4 – Exterior infiltration
- 57. Case Study 4 – Exterior infiltration
- 59. PENCIL TEST – plans and sections UNCONDITIONEDCONDITIONED
- 60. PENCIL TEST – plans and sections UNCONDITIONED CONDITIONED
- 61. PENCIL TEST – plans and sections UNCONDITIONED CONDITIONED
- 62. PENCIL TEST – plans and sections UNCONDITIONED CONDITIONED
- 63. PENCIL TEST – plans and sections
- 64. DETAILS
- 65. DETAILS
- 66. DETAILS
- 67. DETAILS
- 68. DETAILS
- 69. DETAILS
- 70. DETAILS
- 71. DETAILS
- 72. DETAILS
- 73. THE OTHER “C” WORD - COMPATIBILITY
- 74. COMPATIBILITY
- 75. COMPATIBILITY
- 76. COMPATIBILITY