Killerton House is a Grade II* Listed National Trust property on the Killerton Estate near Broadclyst. The original Johnson Range roof dates back to the late 18th Century. It was originally a double pitch, but was considerably altered and truncated in the late 19th Century to form a flat lead roof. Elements of the original roof and ceiling remained. PCA were instructed by the National Trust to design a new roof structure in 2010 which incorporated the original roof elements and reinstated the trusses to form a double pitched roof, however this scheme was not implemented.
In 2016, PCA and Purcell Architects were appointed to design a new lead covered flat roof structure to replace the existing arrangement. The new roof structure incorporated the original primary beams and truss ties, repaired and strengthened as required, with new secondary timbers and roof joists laid to suit the revised gutter arrangements. These were boarded with softwood boards and penny gaps in the traditional fashion, prior to covering with lead.
Repairs were undertaken to the lathe and plaster ceiling below, together with elements within the support structure. The roof void was fully insulated, and M&E services upgraded as necessary.
In addition to these works, chimney structures were rebuilt, glazed lanterns refurbished, and parapet walls repaired including new copings. The Service Range roof was also repaired and re-slated as part of the project.
PCA would like to thank the National Trust and Ewins Aerial Photography for sharing the aerial photography of the completed roof with us.
Visit www.nationaltrust.org.uk/killerton to learn more about this interesting property.
Structural Engineering, Conservation Engineering