The first stonemason is working on a new carved detail. Sections
of stone were added and fixed with stainless steel dowels and epoxy
adhesive, smaller details were generally carved in-situ after fixing
a suitably sized stone. He is using a stone chisel and masons ‘mell’,
a specific type of round hammer.
This second photograph shows a stonemason at work on an ‘indent’,
which involves removing the top face of a damaged stone before fitting
another in place.
The following text is taken from the ‘Repair criteria’
from the Restoration study report:
“Full indents when the entire face of a masonry
unit is decayed or seriously fractured. Full indents may also be
specified when a part indent would be particularly unsightly or
structurally questionable.” “Part Indent: When only
a small section of a large unit is severely decayed or fractured.
Care to be taken to respect the original joint pattern, to avoid
excessive number of small indents. These part indents should be
at least 37-50mm on bed and should have mortar joints of approximately
2mm and securely tied to sound masonry with stainless steel dowels
set in epoxy.