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Sills & Thresholds Performance optimized installation details
Optimizing your PRIUS
Optimizing your Windows
Optimizing your Windows <ul><li>Maximizing the amount of glass </li></ul><ul><li>Location, location, location </li></ul><u...
Darwin’s theory
Darwin’s theory of windows Source: ARCHnews Green Column, June 2009. Dan Johnson, danjoh99@gmail.com
Reducing the Heat Demand Source: Protokollbund Nr. 37, Passive House Institute, Darmstadt, Nov. 2008 Less frame, more glaz...
Location, location, location… Source: Protokollbund Nr. 37, Passive House Institute, Darmstadt, Nov. 2008 Placing the wind...
What does this do to my PHPP? My project: By moving the windows to the center of the wall we reduced the Annual Heat Deman...
Avoid interior cold spots! Images: Stefan Carpentier, Q+ Performance Testing, CA
Over-insulating Simply adding insulation over your frame improves performance! Source: Protokollbund Nr. 37, Passive House...
Options for out-swing windows Example of Danish project over-insulating out-swing windows: Source: Conference Proceedings,...
Over-insulating Sometimes too much of a good thing is not necessary! Source: Protokollbund Nr. 37, Passive House Institute...
Over-insulating Optimizing psi-install with insulation Source: Protokollbund Nr. 37, Passive House Institute, Darmstadt, N...
Not all over-insulating is good Source: Protokollbund Nr. 37, Passive House Institute, Darmstadt, Nov. 2008 Insulating ove...
Options for clad windows Source: Protokollbund Nr. 37, Passive House Institute, Darmstadt, Nov. 2008 Alum-clad on the sash...
What, no more nailing fin? Weaning ourselves off the old installation detail… BEFORE Source: BSC Info Sheet 302, Pan Flash...
Flash often, but flash carefully! Please - NO thermal bridge pan flashing! Sill pan under window to interior
Sill install suggestions… AFTER: Sill pan behind nailing fin and in front of window Bituthane membrane flashing Air-tight ...
The Euro version… AFTER: Sill pan & flashing behind drip edge of window cladding Bituthane membrane flashing Air-tight tap...
And a header install suggestion Euro Header: Over-insulation Nailing clips (Simpson LTP5’s) Air-tight taping at interior W...
Sills for Euro windows…
Now to the thresholds…
Step-over thresholds
Some investigation is needed! LOW THRESHOLD:  U (hdr + jmb)  =  1.13 W/m 2 K U (sill)  = 3.329 W/m 2 K U (frame)  = 1.47 W...
Conclusions <ul><li>Slimmer frames can perform better, despite higher U-values </li></ul><ul><li>Moving the window into th...
Thank you! Presentation & Data: Bronwyn Barry Review & assistance: Stefan Carpentier
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Sills & Thresholds: Passive House Installation Details that boost performance.

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Passive House Window & Door Installations: Improving your performance by improving your details.

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Sills & Thresholds: Passive House Installation Details that boost performance.

  1. 1. Sills & Thresholds Performance optimized installation details
  2. 2. Optimizing your PRIUS
  3. 3. Optimizing your Windows
  4. 4. Optimizing your Windows <ul><li>Maximizing the amount of glass </li></ul><ul><li>Location, location, location </li></ul><ul><li>Insulating the window frame </li></ul><ul><li>Flashing – how to do it discretely! </li></ul><ul><li>A cautionary tale about thresholds </li></ul><ul><li>Conclusions </li></ul>
  5. 5. Darwin’s theory
  6. 6. Darwin’s theory of windows Source: ARCHnews Green Column, June 2009. Dan Johnson, danjoh99@gmail.com
  7. 7. Reducing the Heat Demand Source: Protokollbund Nr. 37, Passive House Institute, Darmstadt, Nov. 2008 Less frame, more glazing lowers your Heating Demand:
  8. 8. Location, location, location… Source: Protokollbund Nr. 37, Passive House Institute, Darmstadt, Nov. 2008 Placing the window in the best location within the wall cavity : Horizontal direction POOR: U w (installed) = 1.05 W/m 2 K Psi-install = 0.039 W/m 2 K BETTER: U w (installed) = 1.00 W/m 2 K Psi-install = 0.023 W/m 2 K BEST: U w (installed) = 0.99 W/m 2 K Psi-install = 0.02 W/m 2 K
  9. 9. What does this do to my PHPP? My project: By moving the windows to the center of the wall we reduced the Annual Heat Demand by 22%. 3.71 4.21 0.005 0.008 50 3.73 4.24 0.006 0.011 30 4.8 4.29 0.009 0.016 0 kBTU/(ft²yr) kBTU/(ft²yr) (BTU/hr.ft.°F) (W/mK) (%) AHD SSHD  Install  Win Loc'n ft 3 12312.25 Gross Enclosed Volume ft 2 796 Gross Heated Building Footprint Area ft 2 1448.5 Treated Floor Area
  10. 10. Avoid interior cold spots! Images: Stefan Carpentier, Q+ Performance Testing, CA
  11. 11. Over-insulating Simply adding insulation over your frame improves performance! Source: Protokollbund Nr. 37, Passive House Institute, Darmstadt, Nov. 2008 BEFORE: U w (installed) = 1.19 W/m 2 K Psi-install = 0.15 W/m 2 K AFTER: U w (installed) = 0.78 W/m 2 K Psi-install = 0.005 W/m 2 K
  12. 12. Options for out-swing windows Example of Danish project over-insulating out-swing windows: Source: Conference Proceedings, 12 th International Conference on Passive Houses 2008, PHI. ‘The Architectural and Technical Consequences of Different Window Details in a Danish Passive House’ by Camilla Brunsgaard, Per Heiselberg and Rasmus L. Jensen, Aalborg University Department of Civil Engineering
  13. 13. Over-insulating Sometimes too much of a good thing is not necessary! Source: Protokollbund Nr. 37, Passive House Institute, Darmstadt, Nov. 2008 30% COVERED: U w (installed) = 0.96 W/m 2 K Psi-install = 0.008 W/m 2 K 50% COVERED: U w (installed) = 0.94 W/m 2 K Psi-install = 0.003 W/m 2 K 100% COVERED: U w (installed) = 0.89 W/m 2 K Psi-install = 0.-013 W/m 2 K
  14. 14. Over-insulating Optimizing psi-install with insulation Source: Protokollbund Nr. 37, Passive House Institute, Darmstadt, Nov. 2008 DISTANCE (Ueb): Exterior glazing to Exterior insulation (m) Psi (W/mK)
  15. 15. Not all over-insulating is good Source: Protokollbund Nr. 37, Passive House Institute, Darmstadt, Nov. 2008 Insulating over Alum-clad frames does not work as well…
  16. 16. Options for clad windows Source: Protokollbund Nr. 37, Passive House Institute, Darmstadt, Nov. 2008 Alum-clad on the sash only performs much better!
  17. 17. What, no more nailing fin? Weaning ourselves off the old installation detail… BEFORE Source: BSC Info Sheet 302, Pan Flashing for Exterior Wall Coverings
  18. 18. Flash often, but flash carefully! Please - NO thermal bridge pan flashing! Sill pan under window to interior
  19. 19. Sill install suggestions… AFTER: Sill pan behind nailing fin and in front of window Bituthane membrane flashing Air-tight taping to the interior <ul><li>Post Presentation Note: </li></ul><ul><li>One audience member pointed out that the exterior wood sill had no way of being attached without penetrating the sill flashing. Two potential options: </li></ul><ul><li>Leave it off and use German-style exposed metal sills as flashing and finish </li></ul><ul><li>Use an A35-type clip to attach the wood sill to the jamb extensions and have it ‘float’ above the metal sill pan. </li></ul>
  20. 20. The Euro version… AFTER: Sill pan & flashing behind drip edge of window cladding Bituthane membrane flashing Air-tight taping to the interior
  21. 21. And a header install suggestion Euro Header: Over-insulation Nailing clips (Simpson LTP5’s) Air-tight taping at interior Window centered in wall
  22. 22. Sills for Euro windows…
  23. 23. Now to the thresholds…
  24. 24. Step-over thresholds
  25. 25. Some investigation is needed! LOW THRESHOLD: U (hdr + jmb) = 1.13 W/m 2 K U (sill) = 3.329 W/m 2 K U (frame) = 1.47 W/m 2 K STEP-OVERTHRESHOLD: U (hdr + jmb) = 1.13 W/m 2 K U (sill) = 1.27 W/m 2 K U (frame) = 1.15 W/m 2 K Overall Performance Delta: 0.32 W/M 2 k (per door)
  26. 26. Conclusions <ul><li>Slimmer frames can perform better, despite higher U-values </li></ul><ul><li>Moving the window into the wall center reduces Heat Demand </li></ul><ul><li>Insulating over the frame improves the window performance </li></ul><ul><li>Metal pan flashing details are tricky – proceed with caution! </li></ul><ul><li>Look out for your door u-values: many low thresholds do not perform well! Account for this in your PHPP calculations. </li></ul>
  27. 27. Thank you! Presentation & Data: Bronwyn Barry Review & assistance: Stefan Carpentier

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