Designed by Charles Hansom, the grade II listed Big School Kitchen (BSK) was built in 1862 with our 2018 re-roofing being part of the biggest refurbishment at the college since its completion.
The new roof
The roof renewal required over 1,000m2 of natural Welsh slates; a combination of Blue/Grey Cwt Y Bugail slates with feature bands of Heather Blue Penrhyn slates, cut to replicate the original design.
The existing roof covering was stripped and renewed on a sectional phasing plan to maintain weather tightness and to ensure the ceiling inside was not left exposed to the elements.
A total of 15,000 of Welsh Slate's Cwt y Bugail Blue/Grey rectangular slates and Penrhyn Heather Blue Arrowhead slates were fitted on the duo-pitch roof in the distinctive ornamental alternating bands,
a feature which had to be replicated.
The roof features also included 20 dormers and particularly long open rafters - over 10 metres - with lath and plaster ceiling boards underneath, as well as pitches of approximately 60° and significant amounts of lead detailing.
The refurbishment included repairs to stone chimneys and replacement of all leadwork to match the existing. 50mm insulation slabs were also introduced between the rafters to improve the roof's u-value.