The biggest advantage of this method is easily and promptness detection of leak places, on all kinds of roof sheathing. Thing worth mention is a fact, that this method requires damaging roof sealing. This is why this method is not recommended for large roofs. Under the roof surface, we introduce special gas, which contains 95% Azote and 5% Hydrogen (Scheme 5). This gas has low density, which goes straight up, in places where the leakage is placed. This method gives us no information about level and the area of moisture material
The choice of the right method depends on the particular situation and the experience of the technicians.