The existing copula was panelled with diminishing moulded ribs cast in fibrous plaster then fitted to the existing insitu lath and lime plaster dome.

First a profile is taken from the dome surface using a plaster jacket This jacket is made into a bench to give the reverse curve bench then using a hinged  running mould the rib mould is run                   

The top reverse rib mould is made.

Precast ribs on site ready for fitting  The top cap and some of the ribs fitted

12 ribs fitted pointing underway.