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Rising damp in walls - diagnosis and treatment (revised ed.)  <B>(Downloadable version)</B>

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Title
Rising damp in walls - diagnosis and treatment (revised ed.) (Downloadable version)
Author
Peter Trotman
Date
12-Oct-2007
Price
£18.00
Stock code
287528
ISBN
978-1-84806-012-8
Abstract

This Digest considers the causes of dampness in walls and how to remedy rising damp if found. It is important to diagnose properly the source of any dampness. If a building already has a physical damp-proof course, it is unlikely that it has failed, as most dpc materials have a long life. Various defects, eg mortar droppings in a cavity wall, may make a dpc ineffective by bridging it and allowing moisture to pass up the wall. This and other mechanisms by which an existing dpc might be bridged are illustrated.

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 describes how to drill samples from a wall in order to test for moisture content and hygroscopicity. The interpretation of moisture gradient profiles is discussed. (See also Good Repair Guide 33 - GRG33.)

If it is necessary to provide a new complete moisture barrier, the Digest explains and illustrates the methods: inserting a membrane as a physical dpc or using the non-traditional method of chemical injection. The repair of plaster damaged by damp is also discussed.

This is a new edition of Digest 245. 12 pages.

Contents:

Mechanism of rising damp
Diagnosis
Determining the source of the dampness
  - Interpretation of results

Treatment:

  •  
    •  
        Injection mortars
        Ready-to-use thixotropic materials
    • - High-pressure injection
      - Low-pressure injection
      - Gravity feed
      - Hand insertion
  • Physical dpc
    Chemical dpc
    Land drainage

Replastering
Dry lining
Further reading
Appendix: The sampling method

Subject/Keywords
BRE Digest 245, DG245, walls, dpc, moisture content, sampling.
Publisher
BRE Electronic Publications BRE Electronic Publications
 
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