Improving the energy performance of historic timber-framed buildings in the UK.

As we aim to improve the performance of our existing building stock, both to reduce carbon emissions and to improve occupant comfort, even timber-framed buildings that have stood for hundreds of years are now the focus of energy retrofits. This paper presents a review of the energy retrofit of three historic, half-timbered buildings in Herefordshire, UK. Using u-value and airtightness data measured in situ, dynamic energy simulations using DesignBuilder have been undertaken to assess the effectiveness of each of the applied retrofit strategies. These strategies include the installation of secondary glazing, plastering of thatched roofing, increased loft insulation and complete replacement of infill panels. Initial results suggest that strategies that result in improved airtightness have the highest impact on energy demand, whilst intrusive interventions within the timber-frame itself have limited positive impact.