Penetrating Damp

Damp penetration usually refers to any water that enters a building and moves through the walls horizontally, or from a higher to a lower level. It is usually associated with external construction defects. Penetrating damp may move about within the building in various ways but is not "rising damp". Penetrating damp occurs as a result of problems with the fabric of the building that can allow water to leak into the walls or floors.

The first sign of damp penetration is often the appearance of damp patches on walls, ceilings or floors. These tend to grow or darken after periods of heavy or prolonged rain. 

The long term effects of water penetration can include damage to decoration and plaster, decay in exposed timber, and mould growth. Penetrating damp is most common in older homes that have solid walls. A new build property with cavity walls offers more protection against driven rain.


Our Services

All surveys are carried out in accordance with:-

  • BS7913:2013 Guide to the Conservation of Historic Buildings
  • BS 5250:2016 Code of practice for control of condensation in buildings.
  • And the SPAB approach to building conservation which combines well-proven principles with practical repair techniques.

JW Surveys carry out the following surveys and reports within the South East of England:

  • Independent Damp & Timber Surveys and Reports
  • Structural Waterproofing Reports to BS8102:2009
  • 7 Days A Week subject to availability



Survey Fees

*Based on a domestic 2 bedroomed property

Property Timber & Damp Survey - from £450.00*

This survey is suitable for most properties, built as early as 1800s except those properties with a “Listed” status.


Click here to find out more about what to expect.