Methods used to identify sources of damp

Charles Piton LogoVisual Inspection

The main areas to focus your inspection:

  • Down pipes and roof guttering
  • Damp proof course issues
  • Roof and flashing issues
  • Age and construction of the property
  • Internal escape of water issues
  • Pointing issues
  • General property maintenance issues of that property and other attached properties

Local Research

  • History of flooding from news articles
  • Postcode search on the Environment Agency site
  • Talk to locals
  • Local councils

Appoint company to carry out moisture survey of the property (CPL t/a CPL t/a CPL t/a Rainbow International)

Method and equipment used in moisture surveys

Test building materials for levels and sources of moisture

  • Electrical moisture meters: Metal pins are inserted into the structural material where electricity flows between the pins. A dry structural material has resistance against the electricity indicating a low reading. Water in the structural material increases conductance and resistance will decrease indicating a wet structural material
  • Moisture profiling: Moisture profiling enables the assessment of the degree of saturation. For example, if a wall is wet at depth then the true moisture profile can only be gained if in-depth readings are retaken.
  • Salt test: This involves taking a sample of the wet material and testing it to detect the presence of salt. One test will detect nitrates which is an indication of current or past rising damp issues. A second test will identify chloride which is present in fresh water sources. If neither are detected the damp may be due to rain water ingression into the property.

Leak detection survey equipment

Thermal imaging: Thermal imaging cameras, also called infrared cameras, detect the heat given off by an object and material. Moisture has different infrared energy waves from building materials so will stand out on a thermal image.
Acoustic Testing: When a pressurised water pipe is damaged, the water leaks out into the surrounding ground which causes the pipe and surrounding material to vibrate at the exit point. By using sophisticated ground microphones, we can trace and pinpoint the location of the leak.
Leaks Using Tracer Gas: Water is drained from the suspected system and a tracer gas is introduced under pressure to the system. The gas is made up of 95% nitrogen and 5% hydrogen. Hydrogen being the smallest and lightest molecule will escape from the pipe at the point of the leak and make its way to the surface where it can be detected by a sensitive gas detector.
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CPL t/a CPL t/a CPL t/a Rainbow International are highly skilled in identifying sources of damp and dealing with damp in a safe and professional manner. We also provide a range of industrial cleaning services for commercial and private properties. Get in touch with us today for more information and a free quote.