DOI: 10.5593/SGEM2014/B62/S26.038


A. Sedlakova, L. Tazky
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-21-6 / ISSN 1314-2704, June 19-25, 2014, Book 6, Vol. 2, 291-298 pp

Moisture is a major source of damage in historic solid masonry. Rising damp is a wellknown phenomenon around the world and occurs when groundwater flows into the base of a construction and is allowed to rise through the pore structure. From practical experience it is known that many factors may play a role regarding permeability problems in masonry. The amount of possible causes of moisture problems in historic masonry underlines the complexity of this phenomenon. Evaporation is an important factor in rising damp. The surface of an affected wall contains moisture that has risen from the ground and this moisture is then subject to evaporation. The factors controlling evaporation include: temperature, humidity, air movement and surface condition (the masonry been painted). [1,3,5,6] The most cost-effective way of preventing damp problems in buildings, including those resulting in damp masonry at the foot of walls, is to minimize moisture sources and provide adequate passive moisture sinks to dissipate any penetrative moisture so as to make the system fail-safe. Traditional and more effective detail is to use a ventilated and drained ’dry area’ around the foot of the wall. Alternatively, a perforated plastic land drain can be laid to falls in a trench lined with geo-textile and back filled with ‘beach cobles’ or large diameter hard core. [1,7,8]

Keywords: rising damp, sub-floor ventilation, drainage, historical building, masonry