How to detect humidity


Aluminum foil is used to detect where moisture comes from. You must apply it on the part that looks wet and if moisture appears on the surface of the paper, it comes from the ambient condensation and is solved by ventilating the place or by putting a heater.
If, on the other hand, the back of the paper appears damp, the moisture comes from inside the wall and must be treated.
Another way to elucidate the origin of the stain on the wall is by placing a piece of porospan on it. If small drops of water appear on the surface, the cause is condensation, but if the drops are thick, they come from inside the wall.
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