Damp found in Homebuyers Report

keith969

teneighty wrote: »

For probably the last 10 years the market leading moisture meters have dual detection. The pin probes for electrical conductivity but they also have non-invasive probes which use radio frequency to take an average reading to a depth of up to 19mm. This helps to identify and differentiate between surface condensation and dampness within the wall.

Measurements using RF use the fact that electromagnetic fields are attenuated by conductive media. So it can tell you what the relative conductivity is between areas, and so if that conductivity difference is due to water (as opposed to some other material) then yes, it will give you an idea of the content of the surface layers. Moisture due to condensation can penetrate below the surface depending on the finish, so you still have to interpret the results with care.

teneighty

I totally agree, good interpretation of the results is the key factor.

I find plotting the results will show the pattern and spread of the damp, that is usually a good starting point. Condensation can be quite predictable, it needs very specific conditions to occur and usually occurs in certain locations within a room but always keep an open mind. The trouble is you often get damp and condensation happening at the same time which can lead to confusing results. That's when the years of training and experience of a good building surveyor or damp expert come into play.