1. What is Passivhaus? by Piers Sadler

2. EnerPHit

3. Passivhaus Criteria Air-tightness0.6ACH @ 50Pa 1 ACH EnerPHit Comfort Surface temperature (windows) >17 o CComfort Summer over-heatingMax 10% >25 o CComfort Ventilation30m 3 /hr/personComfort Heating15 kWh/m 2 /yrEnergy Primary Energy120 kWh/m 2 /yrEnergy Fabric first is embedded in these criteria

4. Passivhaus Criteria Whole building warm No draughts No cold radiant surfaces Fresh air always No summer over-heating Heating bills ~£60/yr

5. Five Basic Principles

6. Comparison with UK Part L1A, 2013

7. Item U values in W/m 2 K Building Regs (typical) Passivhaus (upper limit) Walls U value 0.18 0.15 Roof/floor U value 0.13 Windows U value 1.4 0.8 Doors U value 1.0-1.2 Airtightness 5m 3 /m 2 /hr0.6 ACH Thermal bridging moderatethermal bridge free Ventilation naturalheat recovery Fabric energy efficiency (kWh/m 2 /yr) ~45-6015

8. Building Form Source: AECB Carbonlite, Passivhaus Designer Course

9. Common Misconceptions You can’t open the windows Sealed buildings are unhealthy Mechanical ventilation is energy intensive/expensive Heating is not required ✗ ✗ ✗ ✗

10. Passivhaus Planning Package (PHPP)

11. Certification/Quality Control PHPP Detail drawings Supplementary modelling (thermal bridging) Photographs Air test Design & Construction Certification Completion Design Team

12. Performance Gap Passivhaus Source: Leeds Beckett University

13. Performance Gap Source: Passivhaus Institute

14. Whole Life Costs (NPV) Passivhaus NPV was always less than the typical house

15. Benefits Passivhaus build by Keepmoat, Oldham Source: The Guardian Eliminates fuel poverty Low and predictable CO 2 emissions High levels of thermal comfort Good indoor air quality Health dividend

16. So: What is Passivhaus? First rate thermal comfort Exceptional energy performance Excellent air quality Delivers on design intent Thank you www.piers-sadler.co.uk