Putney Arts Theatre
Ravenna Road, London SW15

The load bearing Kentish Ragstone walls of the converted Putney Unitarian Church, had been painted with psychedelic murals in the 1960's and had been described as ‘the worst eyesore in the borough’. They were found to be in a very poor condition with deeply eroded blocks and a history of falling masonry.

The Bath stone string courses, cills and mouldings were also badly delaminating and the pointing had failed in several places. Retained to complete the work over 4 separate phases, Triton firstly removed the paint back to bare masonry using a range of appropriate poultice systems, with a subsequent wash down using fine nebulous sprays to remove chemical residues from the stonework. Apart from cleaning the building, this ensured that no traces of chemical stripper were left in the stone. The removal of stubborn dirt, in addition to cement based coatings, required the additional use of a controlled low pressure abrasive system.

Individual blocks of Kentish Ragstone were replaced and all loose raking copings re-bedded. New Bath stone shafts were provided to the doorway and defective Bath stone dressings, which included mullions to tracery windows, were cut back to a sound surface, reinforced as necessary with non-ferrous metal and re-profiled with a matching, lime based repair mix.

After all loose and friable material had been removed from the severely spalling stones, re-pointing was undertaken using a similar mix and a graded shelter coat then applied to individual stone blocks.

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