- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 10 Jun 2018
Rising damp in walls - diagnosis and treatment (DG 245)
BRE (Building Research Establishment) is an independent, research-based consultancy, testing and training organisation, operating in the built environment and associated industries.
On 12 October 2007, BRE published Rising damp in walls - diagnosis and treatment (DG 245 revised edition), written by Peter Trotman.
- The rate of evaporation from the wall.
- The porosity of the wall.
- The salt content of the wall and soil.
- The groundwater height and saturation.
- Heating in the building.
Some accumulation of salts can occur in the walls of old buildings even when they do not have a damp problem, so high readings from a moisture meter alone are not conclusive. Appendix A of the 12-page digest describes how to drill samples from a wall in to test for moisture content and hygroscopicity, and the interpretation of moisture gradient profiles.
If a building has a physical damp-proof course (DPC), it is unlikely that it has failed, as most dpc materials have a long life, however, defects such as mortar droppings in a cavity wall, may make a dpc ineffective by bridging it and allowing moisture to pass up through the wall. This and other mechanisms by which an existing dpc might be bridged are discussed.
The content of the digest includes:
- Mechanism of rising damp.
- Determining the source of the dampness.
- Dry lining.
- Further reading.
- Appendix: The sampling method.
 Related articles on Designing Buildings Wiki
- BRE articles on Designing Buildings Wiki.
- Building Research Establishment.
- Damp-proof course.
- Damp proof membrane.
- Defects in brickwork.
- Dew point.
- Diagnosing the causes of dampness (GR 5 revised).
- Interstitial condensation.
- Mould growth.
- Penetrating damp.
- Psychometric chart.
- Rising damp.
- Sling psychrometer.
- Treating brickwork with sealant or water repellent.
- Understanding dampness.
 External references
- BRE Digest 245, Rising damp in walls - diagnosis and treatment.
- Good Repair Guide 33 - GRG33.
Featured articles and news
Conservation in the heritage cities of Venice and Liverpool.
Which room is the most fun to design? Find out the 'Grand Designs' presenter's unusual choice in our interview.
Full suite of speakers are announced for this year's BSRIA Briefing event.
Book your place for the Architectural Technology Awards 2018.
There are many ways of classifying types of building. Have a look at our range of building articles.
BSRIA have launched the 'major update' of the go-to design framework guide for building services.
How to get results with building life cycle assessment.
Government publishes a prospectus inviting proposals for new 'garden communities'.
The Morandi motorway bridge in Genoa collapses during rainstorm while undergoing maintenance works.
'Developed design' is a phrase coined by the RIBA for their 2013 Plan of Work. But what does it actually mean?
New green paper published aiming to rebalance the relationship between landlords and residents and tackle stigma.