Retrofitting requires careful attention to detail and a holistic approach. Although approaches are similar, there is no standard solution. The extent of retrofitting depends on the circumstances of the site but also the available budget.
The existing building fabric and services must be ascertained in order to decide which elements would benefit most from an upgrade. Initial outlay cost against savings over time also needs to be considered as well as the impact of the construction works.
Older timber framed and solid walled buildings pose a challenge to insulate. The timber in older timber framed buildings is inconsistent in profile, size and setting out. It is difficult to insulate between such timber frames. A better option is to create a new skin, either internally or externally. Care needs to be taken not to create a condensation trap with internal insulation.
Double or triple glazing with low E glass, a coating on the glass that reduces thermal transfer, is now standard. Modern glazing also has thermally broken frame profiles to mitigate the transfer of cold from the exterior of the frame to the interior.
A lot of older barn conversions only have single glazing and in some cases in solid metal frames. South facing glazing can be an issue leading to overheating, particularly on highly glazed facades, such as those that often infill barn doors and gables.
With sustainability at the forefront of our agenda, building services have been transformed in recent years. Boilers are more energy efficient. There are greater options for utilising renewable energy, such as air and ground source heat pumps, solar and wind.
An energy efficient heating system works in can tandem with well insulated building fabric. As a result there is less demand on the energy system, which makes it easier to achieve a comfortable environment in all weather conditions.
Two examples of retrofitting are Pye Barn in Oxfordshire and the Chiltern Barn Conversion project, each are individual in their requirements.
Pye Barn was originally converted into a dwelling in the 1935 by architect John Pym and was featured in Country Life magazine. The barn had glorious spaces, but required updating. The heating was inefficient, there was little in the way of insulation, partitions were paper-thin and windows single glazed. My role was to revitalise and retrofit the barn without foregoing the majesty of the spaces. You can read more about the project here.
The Chiltern Barn was partly converted into a dwelling and connected to an existing farmhouse. The pair surround two sides of a courtyard. Much of the barn remained unconverted and it was decided that it would be best to tear the wheel barn as a new conversion in terms ion energy efficiency.
