The Queen's College Record 2020
Reports and College Activities CHAPEL ROOF PROJECT In August 2019 the College began a 54 week project to replace the entire lead work on both Chapel and Hall roofs. Due to the condition of the lead sheeting, both had become vulnerable to water ingress, as several of the large bays of lead had started to slip and many of the sheets and guttering had developed large splits. Within the College records there is no reference to the roof coverings previously being replaced on this building at any time within its 300 year history. David Goddard Project Consultant The programme of work comprised replacement of the existing lead finishes to both the north and south roof slopes, along with the parapet gutters around the perimeter of the building. Up to date methodology, along with newer building control regulations, stipulated that the maximum size of the new lead sheeting would have to be smaller in width than that of the existing. In essence this means that along each slope an additional eight bays had to be incorporated. Four additional bays have been created at the hip end west elevation of the Hall, and a further nine bays added to the semi-circular east end. One of the main reasons for the change to the regulations was to reduce the potential for excess expansion and contraction and to avoid the lead sheets splitting. A ventilation detail to the central ridge section and perimeter gutter also had to be incorporated within the new design. All of these changes required advance approval from the local conservation authority. Before and after shots of timber boards that sit directly underneath the leadwork 52 The Queen’s College | College Record 2020
Reports and College Activities Defective stonework prior to replacement and a newlyrepaired section In order to obtain safe access to the roof and building elevations, it was necessary to construct a comprehensive independent scaffolding, which included a temporary roof for weather protection and an electronic hoist for the safe transportation of heavy materials. In addition to replacing the lead sheeting, various other elements of refurbishment and upgrade were undertaken which included: • Extensive structural timber repairs to the base of several of the primary trusses which had started to decay due to water ingress. The locations were concealed beneath the gutter and not generally visible within the roof void. • Minor repairs to the copper sheeted domed roof above the clock tower. • Specialist cleaning and repair of the stained-glass windows. • Stone repairs to all three exposed facades, including the bell tower and the carved finials around the perimeter of the College clock. • An upgrade of the lightning protection system to incorporate five additional vertical conductors along with excavation of associated earth connection pits. • Installation of a new trace heating and leak detection system to alleviate the potential issue of water ingress associated with the freeze and thaw cycle of snow and ice build-up. • Installation of a leak detection system at the gutter outlet sumps to give early warning of any blockages in these locations. College Record 2020 | The Queen’s College 53
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Reports and <strong>College</strong> Activities<br />
Defective<br />
stonework prior<br />
to replacement<br />
and a newlyrepaired<br />
section<br />
In order to obtain safe access to the roof and building elevations, it was necessary to<br />
construct a comprehensive independent scaffolding, which included a temporary roof for<br />
weather protection and an electronic hoist for the safe transportation of heavy materials.<br />
In addition to replacing the lead sheeting, various other elements of refurbishment and<br />
upgrade were undertaken which included:<br />
• Extensive structural timber repairs to the base of several of the primary trusses<br />
which had started to decay due to water ingress. <strong>The</strong> locations were concealed<br />
beneath the gutter and not generally visible within the roof void.<br />
• Minor repairs to the copper sheeted domed roof above the clock tower.<br />
• Specialist cleaning and repair of the stained-glass windows.<br />
• Stone repairs to all three exposed facades, including the bell tower and the carved<br />
finials around the perimeter of the <strong>College</strong> clock.<br />
• An upgrade of the lightning protection system to incorporate five additional vertical<br />
conductors along with excavation of associated earth connection pits.<br />
• Installation of a new trace heating and leak detection system to alleviate the<br />
potential issue of water ingress associated with the freeze and thaw cycle of snow<br />
and ice build-up.<br />
• Installation of a leak detection system at the gutter outlet sumps to give early<br />
warning of any blockages in these locations.<br />
<strong>College</strong> <strong>Record</strong> <strong>2020</strong> | <strong>The</strong> Queen’s <strong>College</strong> 53
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