Drying times of a wet wall;

One of the most common questions we are asked about walls that have rising damp and condensation is how long it will take to dry them out. There is no one quick answer because it depends on the extent of the damage and the type of wall and waterproof finish coats used, which is the main problem in the deterioration of wall structures. It could take a few days or a few weeks or even months.

La conoscenza approfondita del coefficiente di prosciugamento risulta essere un elemento imprescindibile nella corretta pianificazione degli interventi di deumidificazione o di rivestimento murario. Tale parametro consente, infatti, di stimare con precisione i tempi necessari affinché il supporto murario raggiunga un livello di asciugatura idoneo, garantendo così le condizioni ottimali per l’applicazione efficace e duratura del rivestimento deumidificante Dwall.

Tale sistema contrariamente agli intonaci risananti non utilizza l’acqua nel suo processo di posa, acconsentendo di velocizzare le fasi di conclusione dei cantieri senza dove attendere i tempi di asciugatura delle murature.

Below is the Empirical Formula for determining the drainage time by Kettenacker's method.

T = Drainage time.

P = Absorption coefficient

S = Thickness expressed in centimeters.

T=P*(S)2

Coefficiente di prosciugamento (p) di alcuni materiali edili

• Mattoni cotti (mediamente): 0,28

• Pietra calcarea (mediamente): 1,20

• Calcestruzzo di pomice: 1,40

• Calcestruzzo cellulare (mediamente): 1,20

• Malta di calce aerea: 0,25

• Malta di calce aerea e sabbia: 0,25

• Malta di calce forte e sabbia: 0,27

• Malta bastarda: 1,35

• Malta cementizia: 1,58

Supporto in Calcestruzzo S. di 40 cm spessore necessita di circa: t = 1,60 x (402) = 2560 giorni pari 7 anni circa.

Supporto in pietra calcarea di 40 cm di spessore necessita di circa: t =1.20 x 402) =1920 giorni pari a 5 anni circa.

Supporto in mattoni cotti di 40 cm di spessore necessita di circa: t = 0.28 x (402) = 448 giorni pari a 1 anno circa.

These data change depending on the proportionality constant that is applied.

Capillary dampness can be recognized by various signs, e.g., unpleasant odor of dampness, mold growth, plaster falling off the wall, appearance of lime and nitrates on the wall surface,appearance of salt on the wall surface and exceptionally cold surfaces, etc.

Water in masonry when it rises up our masonry carries with it a high value of dissolved salts contained in the soil, and can rise up to 1.5 meters and more above the level of country elevations.

When the wall that has capillary rising damp begins to dry, salt deposits appear on the wall surface and decay of the wall plaster and wall structure begins. Freeze-thaw cycles accelerate this process leading to detachments to even substantial portions of plaster .

Capillary rise refers to the ability of a liquid to flow in confined spaces without the assistance of external forces. The height to which a liquid will rise in a capillary tube is determined by the balance between cohesive forces (attraction between the liquid molecules) and adhesive forces (attraction between the liquid molecules and the tube surface).

Un muro umido perde dal 30 al 50% del suo potere isolante.

Our answer as a cure for the pathology of walls plagued by rising damp and the application of dehumidifying coating Dwall.