The decision to repoint is most often related to some obvious sign of
deterioration, such as disintegrating mortar, cracks in mortar joints, loose
bricks or stones, damp walls, or damaged plasterwork. It is, however,
erroneous to assume that repointing alone will solve deficiencies that result
from other problems. The root cause of the deterioration--leaking
roofs or gutters, differential settlement of the building, capillary action
causing rising damp, or extreme weather exposure--should always be dealt with
prior to beginning work.
 Masons practice using lime putty mortar to repair historic marble. Photo: NPS files. |
Without appropriate repairs to eliminate the source
of the problem, mortar deterioration will continue and any repointing will
have been a waste of time and money.
Use of Consultants. Because there are so many possible causes for
deterioration in historic buildings, it may be desirable to retain a
consultant, such as a historic architect or architectural conservator, to
analyze the building. In addition to determining the most appropriate
solutions to the problems, a consultant can prepare specifications which
reflect the particular requirements of each job and can provide oversight of
the work in progress. Referrals to preservation consultants frequently can be
obtained from State Historic Preservation Offices, the American Institute for
Conservation of Historic and Artistic Works (AIC), the Association for
Preservation Technology (APT), and local chapters of the American Institute of
Architects (AIA).
"Repointing Mortar Joints" an Historic Preservation Brief
