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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.

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

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  • How many folks here own a Prius? Today I will be comparing the windows your are specifying to a Prius and I’m going to give you some tools to turn your standard 45mpg Prius into
  • It only takes a little to gain a lot!
  • Prevent bulk water intrusion at the corners!
  • I’ve seen many great low thresholds on the Passive House certified doors…
  • But then I also kept seeing these step-over thresholds… It seemed odd that if they know how to make the low ones, why would they use the step-overs??

Transcript

  • 1. Sills & Thresholds Performance optimized installation details
  • 2. Optimizing your PRIUS
  • 3. Optimizing your Windows
  • 4. Optimizing your Windows
    • Maximizing the amount of glass
    • Location, location, location
    • Insulating the window frame
    • Flashing – how to do it discretely!
    • A cautionary tale about thresholds
    • Conclusions
  • 5. Darwin’s theory
  • 6. Darwin’s theory of windows Source: ARCHnews Green Column, June 2009. Dan Johnson, danjoh99@gmail.com
  • 7. Reducing the Heat Demand Source: Protokollbund Nr. 37, Passive House Institute, Darmstadt, Nov. 2008 Less frame, more glazing lowers your Heating Demand:
  • 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. 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. Avoid interior cold spots! Images: Stefan Carpentier, Q+ Performance Testing, CA
  • 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. 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. 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. 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. 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. Options for clad windows Source: Protokollbund Nr. 37, Passive House Institute, Darmstadt, Nov. 2008 Alum-clad on the sash only performs much better!
  • 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. Flash often, but flash carefully! Please - NO thermal bridge pan flashing! Sill pan under window to interior
  • 19. Sill install suggestions… AFTER: Sill pan behind nailing fin and in front of window Bituthane membrane flashing Air-tight taping to the interior
    • Post Presentation Note:
    • One audience member pointed out that the exterior wood sill had no way of being attached without penetrating the sill flashing. Two potential options:
    • Leave it off and use German-style exposed metal sills as flashing and finish
    • Use an A35-type clip to attach the wood sill to the jamb extensions and have it ‘float’ above the metal sill pan.
  • 20. The Euro version… AFTER: Sill pan & flashing behind drip edge of window cladding Bituthane membrane flashing Air-tight taping to the interior
  • 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. Sills for Euro windows…
  • 23. Now to the thresholds…
  • 24. Step-over thresholds
  • 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. Conclusions
    • Slimmer frames can perform better, despite higher U-values
    • Moving the window into the wall center reduces Heat Demand
    • Insulating over the frame improves the window performance
    • Metal pan flashing details are tricky – proceed with caution!
    • Look out for your door u-values: many low thresholds do not perform well! Account for this in your PHPP calculations.
  • 27. Thank you! Presentation & Data: Bronwyn Barry Review & assistance: Stefan Carpentier