Because of the devastating effect of the fire and the bombing, the old wooden construction of the roof and spires was was replaced by a specially developed construction procedure, in which the roof comprised a layer of lightweight concrete underneath a layer of copper.
The old wooden construction of the roof and spires was was replaced by a specially developed construction procedure. This was because of the devastating effect of the fire. This was because of the devastating effect of the bombing. The roof comprised a layer of lightweight concrete underneath a layer of copper in a specially developed construction procedure.