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Stuff It or Wrap It? Considerations for
Super Insulated Walls & Roofs
SEATTLE AIA BUILDING ENVELOPE FORUM – DECEMBER 9, 20...
CAUTION: Insulation!
Caution! Lots of
Insulation &
Innovation
Industry Drivers & Trends towards Super Insulation
 Trend towards more efficiently insulated
building enclosures due to h...
Key Building Enclosure Considerations
 “Super-Insulated” building enclosures require
careful design and detailing to ensu...
From Code Minimum to Super Insulation
 In Pacific Northwest (Climate Zones 3 – 6)
minimum energy code R-value targets are...
Where to Add the Insulation?
Stuff It?
Wrap It?
Getting to Super Insulation Levels in Walls
Baseline
2x6 w/ R-22
batts = R-16
effective
Exterior Insulation: R-20 to R-40+...
10
15
20
25
30
35
40
45
5 6 7 8 9 10 11 12 13 14 15
EffectiveR-valueofWall
Total Wall Thickness (Excluding Cladding) [inch...
Cladding Attachment & Exterior Insulation
 Exterior insulation is only as good as the
cladding attachment strategy
 How ...
Many Alternate Attachment Options & Counting
Continuous Metal Girts – Not Super Insulated
Metal Clip & Rail – Getting Better
Thermally Improved Clip & Rail Systems
Screws through Exterior Insulation
Cladding Attachment Matters – Effective R-values
20
30
40
50
60
70
80
16.8 33.6 50.4
EffectiveR-ValueofWholeWallAssembly
(...
0%
20%
40%
60%
80%
16.8 33.6 50.4
PercentThermalDegredationofExteriorInsulation
Nominal R-Value of Exterior Insulation (ft...
Getting to Super Insulation Levels in Low-Slope Roofs
Baseline (Vented
Roof) ~R-30
Exterior Insulated
(Conventional or
PMR...
Some Considerations for Super Insulated Roofs
Some Considerations for Super Insulated Roofs
4” stone wool
+
4” polyiso
+
2-8” EPS
=
R-50+
 rdh.com
Discussion
GRAHAM FINCH – GFINCH@RDH.COM – 604.873.1181
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Building Enclosure Considerations for Super Insulated Walls and Roofs

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Short Rapid-Fire Presentation from Seattle AIA Building Envelope Forum on Super Insulated Walls and Roofs

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Building Enclosure Considerations for Super Insulated Walls and Roofs

  1. 1. Stuff It or Wrap It? Considerations for Super Insulated Walls & Roofs SEATTLE AIA BUILDING ENVELOPE FORUM – DECEMBER 9, 2014 GRAHAM FINCH, MASC, P.ENG – PRINCIPAL, RDH BUILDING SCIENCES
  2. 2. CAUTION: Insulation! Caution! Lots of Insulation & Innovation
  3. 3. Industry Drivers & Trends towards Super Insulation  Trend towards more efficiently insulated building enclosures due to higher energy code targets and uptake of passive design strategies  At a point where traditional assemblies are being replaced with new ones  Seeing more new building materials, enclosure assemblies and construction techniques  Greater attention paid to reducing thermal bridging & use of effective R-values instead of nominal insulation R-values  Optimization of cladding attachments for both structural and thermal performance  Thicker amounts of insulation – particularly in low-slope roofs
  4. 4. Key Building Enclosure Considerations  “Super-Insulated” building enclosures require careful design and detailing to ensure durability  Art of balancing various materials, costs, and detailing considerations  Shift insulation to the exterior the structure to improve performance and durability  Minimize thermal bridging by optimizing structural connections and other components  Well insulated buildings require balancing thermal performance of all components & airtightness  No point super-insulating walls or roofs if you have large thermal bridges - address the weakest links first
  5. 5. From Code Minimum to Super Insulation  In Pacific Northwest (Climate Zones 3 – 6) minimum energy code R-value targets are in range of:  R-15 to R-20 effective for walls  R-20 to R-50 effective for roofs  R-2 to R-4 for windows  Green or more energy efficient building programs including Passive House, R-value targets in range of:  R-25 to R-50+ effective for walls  R-40 to R-80+ effective for roofs  R-6+ for windows  Other drivers – air-tight, thermal comfort, passive design, mold-free
  6. 6. Where to Add the Insulation? Stuff It? Wrap It?
  7. 7. Getting to Super Insulation Levels in Walls Baseline 2x6 w/ R-22 batts = R-16 effective Exterior Insulation: R-20 to R-40+ effective • Constraints: cladding attachment, wall thickness • Good for wood/steel/concrete Deep/Double Stud: R-20 to R-40+ effective • Constraints wall thickness • Good for wood, wasted for steel Split Insulation: R-20 to R-40+ effective • Constraints: cladding attachment • Good for wood, palatable for steel
  8. 8. 10 15 20 25 30 35 40 45 5 6 7 8 9 10 11 12 13 14 15 EffectiveR-valueofWall Total Wall Thickness (Excluding Cladding) [inches] Effective Wall R-value versus Wall Thickness Split Insulated (2x6) & R-4/inch EI Split Insulated (2x6) & R-4/inch EI (w/ Screws) Split Insulated (2x4) & R-4/inch EI Split Insulated (2x4) & R-4/inch EI (w/Screws) Double Stud (2x4) w/ R- 3.4/inch Ins. TJI Stud w/ R- 3.4/inch Ins. Insulation Approach & Wood-frame Wall Thickness 0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 5 6 7 8 9 10 11 12 13 14 15 PercentThermalDegradationofInstalledInsulation Total Wall Thickness (Excluding Cladding) [inches] Thermal Degradation of Insulation versus Wall Thickness
  9. 9. Cladding Attachment & Exterior Insulation  Exterior insulation is only as good as the cladding attachment strategy  How to achieve true continuous insulation (ci) performance?  What attachment systems work best?  What types of insulation?
  10. 10. Many Alternate Attachment Options & Counting
  11. 11. Continuous Metal Girts – Not Super Insulated
  12. 12. Metal Clip & Rail – Getting Better
  13. 13. Thermally Improved Clip & Rail Systems
  14. 14. Screws through Exterior Insulation
  15. 15. Cladding Attachment Matters – Effective R-values 20 30 40 50 60 70 80 16.8 33.6 50.4 EffectiveR-ValueofWholeWallAssembly (ft2·F·hr/BTU) Nominal R-Value of Exterior Insulation (ft2· F·hr/BTU) NO PENETRATIONS NO PENETRATIONS NO PENETRATIONS Nominal R-Value of Exterior Insulation (ft2·°F·hr/BTU) 4” – R-16.8 8” – R-33.6 12” – R-50.4 Continuous Vertical Z-Girt - 16" OC Continuous Horizontal Z-Girt - 24" OC Aluminium T-Clip - 16" x 48" Aluminium T-Clip - 16" x 24" Intermittent Galvanized Z-Girt - 16" x 48" Intermittent Galvanized Z-Girt - 16"x 24" Isolated Galvanized Clip - 16" x 48" 20 30 40 50 60 70 1 6 . 3 3 . 5 0 . Continuous Vertical Z-Girt - 16" OC Continuous Horizontal Z-Girt - 24" OC Aluminium T-Clip - 16" x 48" Aluminium T-Clip - 16" x 24" Intermittent Galvanized Z-Girt - 16" x 48" Intermittent Galvanized Z-Girt - 16"x 24" Isolated Galvanized Clip - 16" x 48" Isolated Galvanized Clip - 16" x 24" Intermittent SS Z-Girt - 16" 48" Intermittent SS Z-Girt - 16" x 24" Fiberglass Clip - 16" x 48" Fiberglass Clip - 16" x 24" Galvanized Screws - 16" x 16" 20 30 40 50 60 70 1 6 . 8 3 3 . 6 5 0 . 4 Continuous Vertical Z-Girt - 16" OC Continuous Horizontal Z-Girt - 24" OC Aluminium T-Clip - 16" x 48" Aluminium T-Clip - 16" x 24" Intermittent Galvanized Z-Girt - 16" x Intermittent Galvanized Z-Girt - 16"x Isolated Galvanized Clip - 16" x 48" Isolated Galvanized Clip - 16" x 24" Intermittent SS Z-Girt - 16" 48" Intermittent SS Z-Girt - 16" x 24" Fiberglass Clip - 16" x 48" Fiberglass Clip - 16" x 24" Galvanized Screws - 16" x 16" Galvanized Screws - 16" x 12" SS Screws - 16" x 16" SS Screws - 16" x 12" Effective R-Value of 2x6 Wall (R-20 batt) + Exterior Insulation as Indicated 20 30 40 50 60 70 80 16.8 33.6 50.4 EffectiveR-ValueofWholeWallAssembly (ft2·F·hr/BTU) Nominal R-Value of Exterior Insulation (ft2· F·hr/BTU) NO PENETRATIONS NO PENETRATIONS NO PENETRATIONS 20 30 40 50 60 70 80 16.8 33.6 EffectiveR-ValueofWholeWallAssembly (ft2·F·hr/BTU) Nominal R-Value of Exterior Insulation (ft2· F·hr/BTU) NO PENETRATIONS NO PENETRATIONS 20 30 40 50 60 70 80 16.8 EffectiveR-ValueofWholeWallAssembly (ft2·F·hr/BTU) NO PENETRATIONS20 30 40 50 60 70 80 16.8 EffectiveR-ValueofWholeWallAssembly (ft2·F·hr/BTU) NO PENETRATIONS 20 30 40 50 60 70 80 16.8 33.6 50.4 EffectiveR-ValueofWholeWallAssembly (ft2·F·hr/BTU) Nominal R-Value of Exterior Insulation (ft2· F·hr/BTU) NO PENETRATIONS NO PENETRATIONS NO PENETRATIONS 20 30 40 50 60 70 80 16.8 33.6 EffectiveR-ValueofWholeWallAssembly (ft2·F·hr/BTU) Nominal R-Value of Exterior Insulation (ft2· F·hr/B NO PENETRATIONS NO PENETRATIONS 20 30 40 50 60 70 80 16.8 EffectiveR-ValueofWholeWallAssembly (ft2·F·hr/BTU) Nominal R-Va NO PENETRATIONS20 30 40 50 60 70 80 16.8 EffectiveR-ValueofWholeWallAssembly (ft2·F·hr/BTU) Nominal R-Valu NO PENETRATIONS 20 30 40 50 60 70 80 16.8 33.6 50.4 EffectiveR-ValueofWholeWallAssembly (ft2·F·hr/BTU) Nominal R-Value of Exterior Insulation (ft2· F·hr/BTU) NO PENETRATIONS NO PENETRATIONS NO PENETRATIONS 20 30 40 50 60 70 80 16.8 33.6 50.4 EffectiveR-ValueofWholeWallAssembly (ft2·F·hr/BTU) Nominal R-Value of Exterior Insulation (ft2· F·hr/BTU) NO PENETRATIONS NO PENETRATIONS NO PENETRATIONS 20 30 40 50 60 70 80 16.8 33.6 EffectiveR-ValueofWholeWallAssembly (ft2·F·hr/BTU) NominalR-ValueofExterior Insulation(ft2· F·hr NO PENETRATIONS NO PENETRATIONS 20 30 40 50 60 70 80 16.8 33.6 EffectiveR-ValueofWholeWallAssembly (ft2·F·hr/BTU) NominalR-ValueofExteriorInsulation(ft2· F·hr/BTU) NO PENETRATIONS NO PENETRATIONS
  16. 16. 0% 20% 40% 60% 80% 16.8 33.6 50.4 PercentThermalDegredationofExteriorInsulation Nominal R-Value of Exterior Insulation (ft2· F·hr/BTU) Towards Super Insulation with Exterior Insulation Continuous Vertical Z-Girt - 16" OC Continuous Horizontal Z-Girt - 24" OC Aluminium T-Clip - 16" x 48" Aluminium T-Clip - 16" x 24" Intermittent Galvanized Z-Girt - 16" x 48" Intermittent Galvanized Z-Girt - 16"x 24" Isolated Galvanized Clip - 16" x 48" 20 30 40 50 60 70 1 6 . 3 3 . 5 0 . Continuous Vertical Z-Girt - 16" OC Continuous Horizontal Z-Girt - 24" OC Aluminium T-Clip - 16" x 48" Aluminium T-Clip - 16" x 24" Intermittent Galvanized Z-Girt - 16" x 48" Intermittent Galvanized Z-Girt - 16"x 24" Isolated Galvanized Clip - 16" x 48" Isolated Galvanized Clip - 16" x 24" Intermittent SS Z-Girt - 16" 48" Intermittent SS Z-Girt - 16" x 24" Fiberglass Clip - 16" x 48" Fiberglass Clip - 16" x 24" Galvanized Screws - 16" x 16" 20 30 40 50 60 70 1 6 . 8 3 3 . 6 5 0 . 4 Continuous Vertical Z-Girt - 16" OC Continuous Horizontal Z-Girt - 24" O Aluminium T-Clip - 16" x 48" Aluminium T-Clip - 16" x 24" Intermittent Galvanized Z-Girt - 16" x Intermittent Galvanized Z-Girt - 16"x Isolated Galvanized Clip - 16" x 48" Isolated Galvanized Clip - 16" x 24" Intermittent SS Z-Girt - 16" 48" Intermittent SS Z-Girt - 16" x 24" Fiberglass Clip - 16" x 48" Fiberglass Clip - 16" x 24" Galvanized Screws - 16" x 16" Galvanized Screws - 16" x 12" SS Screws - 16" x 16" SS Screws - 16" x 12" Percent Thermal Degradation of Exterior Insulation Nominal R-Value of Exterior Insulation (ft2·°F·hr/BTU) 4” – R-16.8 8” – R-33.6 12” – R-50.4
  17. 17. Getting to Super Insulation Levels in Low-Slope Roofs Baseline (Vented Roof) ~R-30 Exterior Insulated (Conventional or PMR Roof) • Best durability but most expensive • Some challenges with more layers of insulation & detailing • Simple design Deeper Joist/Truss – (Vented or Unvented Roofs) • Least durable but least expensive • Simple design • Standard details with deeper structure Split Insulated (Unvented Roof) • Decent durability • Moderate cost • More complex design
  18. 18. Some Considerations for Super Insulated Roofs
  19. 19. Some Considerations for Super Insulated Roofs 4” stone wool + 4” polyiso + 2-8” EPS = R-50+
  20. 20.  rdh.com Discussion GRAHAM FINCH – GFINCH@RDH.COM – 604.873.1181

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