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Bill Butcher, Certified Passive House Consultant Director Green Building Store & Green Building Company
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• The conversion of a 19th century barn to a multi purpose educational centre
• To meet the PassivHaus EnerPHit standard for retrofit
• ‘Box within a box’, internal timber frame structure for structural stability, thermal performance, and air tightness
• Major underpinning of foundations and partial rebuild of masonry walls
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• Thermal performance
• Structural stability
• Airtightness
• Wind tightness
• Elimination of any interstitial moisture risk
• Integration of tanking
• Draining the cavity of any rain ingress
• Ventilation of cavity to eliminate risk of solar driven moisture
Internal wall insulation considerations
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Risks of moisture within the wall cavity, WUFI analysis
Unventilated cavity
Ventilated cavity
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Window & door installation
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Window & door installation
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MVHR strategy
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1) Building envelope Exterior insulation: U ≤ 0.15 W/(m²K) Interior insulation: U ≤ 0.35 W/(m²K) 2) Windows Uw, installed ≤ 0.85 W/(m²K) 3) External doors UD, installed ≤ 0.80 W/(m²K) 4) Ventilation Heat recovery efficiency ≥ 75 % More information and guidance on the EnerPHit ‘Elemental method’ is at: http://passiv.de/downloads/03_certification_criteria_enerphit_en.pdf
Certification: Elemental route
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Free resources on the project are available at: www.greenbuildingstore.co.uk/enerphit
More information