SIG Design & Technology were chosen for the redevelopment of the former Bristol General Hospital building to 205 luxury apartments and houses.
The challenge for the contractors was to recreate the Ogee Dome, which once capped the unique 25 metre octagonal tower, with the replica forming part of plans to return the building to its original exterior design of 1853.
Modern materials were employed in the quest to recreate part of Bristol’s heritage. SIG Design & Technology supplied IKO’s Armourplan PSG membrane because it fitted the bill perfectly as the roof covering was ideal for replicating the original seamed lead roof.
Recreating the dome required the employment of skilled carpenters to build a structure 10 metres wide by nine metres high and weighing over 16 tonnes once completed.
The challenge facing roofing contractors Roofworx was also testing. The replica dome is an uneven structure comprising three sections overall, rather than resembling a uniform sphere.
As well as the replicate lead seams – recreated as standing seams using Armourplan PSG – a key feature of the dome are eight dormer windows which protrude from the two storeys of the main structure.
The roofing membrane needed to be carefully dressed around the windows, leaving the timber faces exposed for aesthetic reasons. Metal pressure plates were fixed to all abutments and laps in the membrane.
As well as being a suitable aesthetic fit for this high profile project, Armourplan PSG comes with a 25 year guarantee. By utilising the same high quality UV resistant PVC compound on both the upper and lower side of the membrane, Armourplan PSG ensures optimal weld strength and quality.
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