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The ProblemThe facade to be inspected
The employees in an office block were constantly complaining about distracting noises and unpleasant smells that were coming from the raised floors of their offices. Because of the nature of the noises and the distinct smell, it quickly became clear that mice had to be at the root of the problem. This meant that our engineers had to act fast: some mice droppings can even contain a virus, the so-called Hantavirus, which is life-threatening and for which there is at the moment no known treatment or cure. The engineers had to find out exactly where the mice’s secret entrances to the raised floors were so that the pest control experts could take over and carry out their job.

The engineers decided to use a method which is the raised floor to be examinednormally very popular and effective when inspecting flat roofs to determine where leaks in the waterproof membrane are allowing moisture to seep into the building. The fog simulation method is equally well-suited as a non-destructive inspection method for determining where holes in the raised floors of both modern-day and older buildings are.

The Solution
The VDL engineers proceeded to prepare the cavities below the floors for closer inspection:

First, they sealed the exits leading off the inspection area with special tape so as to preventescaping fog at the window fog from spreading to adjacent cavities under the raised floor.

Then the raised floor was slowly and systematically flooded with fog.

As soon as the cavity below the floor was flooded, fog started to escape at the windows behind the curtain-type walls. These concealed openings obviously provided the entry and exit points for the tiny little rodents who had turned the raised floors into their new home.

Conclusion
The fog fluid used to produce the fog is based on hydrogen. It is complete odourless and Fog escaping at the window framecompletely harmless.

This non-destructive method is ideally-suited for locating holes and openings leading off such cavities as those described above.

Once detected the holes can be sealed and the problem remedied. This particular method provides an optimum means for inspecting hard-to-reach or virtually inaccessible areas and is therefore also ideal for examining fire bulkheads in supply shafts.

The non-destructive method used by our engineers was the first step in a chain of actions which allowed the problem to be identified and effective measures to be taken. The office employees can now rest assured that the mice that had been scurrying to and fro under their very feet
– and noses – would now no longer be distracting them from their work and
that a potential health hazard had been effectively removed.

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