The accumulation of moisture on the wall can be differently evident and can cause more or less severe damage to masonries. A masonry that has been in contact for a long time with a wet environment and with scarce ventilation can rapidly degradate.
Hydrosoluble salts, which can be introduced into the masonry with the mixing water of mortars or with rising damp, produce chemical reactions that form efflorescences, disgregation of bedding mortar and plaster, until completely ruined the stability of the masonry.
One of the possible solutions to the problem of rising dampn is the application of a macroporous dehumidifying plaster, highly filled with air. These plasters allow the dampness inside the wall to evaporate outside.
To avoid that with time the salts present inside the mansonry will fill the porosity of the material, thus preventing the evaporation of water, the hollows of these special plasters have a much greater diameter than the traditional plaster. The use of dehumidifying plasters in combination with materials able to create barriers against salt also helps to lengthen the dehumidifying effect of this type of solution.
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