ABSTRACT
The specific information required will depend on the function of the wall and the purposes of the assessment. However, even the most basic assessment will require determination of the geometry of the wall – ideally beginning with an elevation, showing the wall from the front with its length measured, and its height shown at different points along its length. A fresh crack in an old wall could be a matter of concern, as it could be a consequence of stone deterioration, external loading or settlement or subsidence causing a redistribution of load within the wall. Working with tape measures is easiest with clear access to the top of the wall as well as to the ground in front of it. Walls of inferior construction may nevertheless give many years of good service, but may be very vulnerable to changes in their loading, whether brought about by vehicle loading or by heavy rainfall.
