Architectural Design and Illustration
HEDNANT
Built in 1936 as a holiday cottage, this timber-framed house has been home to a family of four for the last ten years. The primary objective was improved energy efficiency, with the additional aim of overhauling the building's deteriorating external fabric. The clients also expressed a desire to use low-carbon, environmentally friendly materials wherever possible.
All external cladding was removed and the existing structure strengthened as necessary, then re-sheathed with 18mm OSB, with all joints sealed for air-tightness. Although not tested, it is likely the building now approaches 'Passivhaus' levels of airtightness. A total of 220mm of wood-fibre insulation on all external wall and roof surfaces, achieved an overall U-Value of 0.19 W/m2K. Critically, the 'breathable' nature of wood-fibre insulation, combined with lime / cement render finish also helps protect the original timber structure from decay caused by trapped moisture. Insulating the house externally meant the family were able to continue living in the property throughout the duration of the works except for one week during removal of asbestos cladding and soffit boards. Partially 'off-grid' (electricity as the only mains connection), renewable energy sources would be a good assett to this property. However it's location within the surrounding topography ruled out any effective solar energy capture. A ground-source heat pump will be considered as finances allow. ( Back ) |
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