Totnes Passivhaus project statistics
Retrofit element: conventional cavity wall construction with high performance external insulation; self-coloured render (wall U-value 0.10W/m²K)
New build element, using natural, breathable materials: Steico timber I-frame with woodfibre and sheepswool insulation, clad in UK sourced, FSC sweet chestnut cladding (average wall U-value 0.11W/m²K), living roof.
Usable floor area (TFA): 162m² | form factor (ext. area/TFA): 2.62 | design space heating demand: 13.3kWh/m² per annum; heating load 9.3W/m²
Ventilation: PHI Certified heat recovery (MVHR), Paul Novus 300 with Lindab Safe ducting
Air tightness: 0.2 air changes/hour on final airtightness test for Certification.
Windows: Internorm Varion/Varion 4, integrated blinds for summertime shading, installed whole window U-value from under 0.85W/m²K, g-value 0.6 on solar gain facades, double e-coated, argon filled.
Renewables: photovoltaics - Mobasolar panels, total 3.99kWp, Fronius IG TL transformerless inverter; solar hot water - Rotex 500 litre thermal store with 9.4m² of integrated roof panels
Construction cost (exc. VAT) per m² gross floor area: ca. £1400
Location: Totnes, Devon | completed in Aug 2011 | certified in Sept 2011.
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