The Advice Series published by the Architectural Heritage Advisory Unit provides guidance for owners and custodians on how best to repair and maintain for the buildings and monuments in their care. ‘Ruins – The Conservation and Repair of Masonry Ruins’ written by Margaret Quinlan with Mary Hanna and David Kelly provides good advice for those looking after the many masonry ruins that dot the Irish countryside.
Its available to download here http://www.ahrrga.gov.ie/app/uploads/2015/07/Ruins-The-Conservation-and-Repair-of-Masonary-Ruins-2010.pdf