Roof leak, detection with thermal imaging

Roof leaks can be difficult to detect, sometimes they only occur when wind blows from a certain direction. Sometimes the leak is small, so small as to be undetectable with visual inspection. However, dampens from roof leak will be absorbed into building elements and can encourage growth of mould. Mould is unhealthy and can cause respiratory problems. In sufficient quantity there is unmistakeable smell of mould in the room.

Just last week I inspected a property where there was strong smell in one bedroom. The most likely source was inadequate sub floor ventilation and poor drainage against external wall that has been built up too high against brickwork.

Then I did what I always do, performed thermal imaging scan on the ceilings and walls and “Bingo”. There were unmistakeable images of dark areas consistent with coldness from dampness. TI is so reliable that checking is almost never required to confirm existence of dampness but is required for report content. I checked ceiling in suspect areas and yes moisture meter went off  (moisture content over 18% triggers audible beeping) Walls were checked and all below head height reading was 10% but just below cornice it was 15-16%.

As is usual, this dwelling did not have one problem causing dampness but three, sub floor ventilation and drainage defects + roof leaks. When I showed owner thermal images he was blown away, he had not suspected roof leaks.

If you have suspected dampness, mould or mould smell in the room TI can under some conditions lead you to the cause of the problem.

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