The stables at Silverton are magnificent. They were in full view of the house and were designed to be imposing. The whole was intended to be Stucco but it never was. The portico faced the main house and has no entrance behind it. The pillars are surmounted by "safe" lintels of flagstone. Brick arches carry the main load. There is a band of "cement" mortar through the arches and about 3 courses above them.
Wrought iron cramps tie the lintels end to end. These have corroded and lifted the whole pediment about 2mm so the whole structure is supported on about 10000mm2 of iron at each pier.
Can the corrosion be arrested by cathodic protection?