Rising Damp in Condominium Walls: Who Is Responsible

Rising damp is water that climbs by capillary action from the ground along the walls, degrading plaster and encouraging mould. To establish who pays, the cause must first be ascertained: if it depends on the deterioration or absence of a barrier on common structures, such as foundations, retaining walls or ventilated crawl spaces, the condominium is liable and the cost is split by thousandths (millesimi) under Article 1123 of the Italian Civil Code. If instead the origin lies in an exclusively owned part, the burden falls on the single owner.

How it appears and where it comes from

The phenomenon is recognised by stains at the base of walls, crumbling plaster, whitish saline efflorescence and mould in corners. Water can rise from the ground through the masonry in contact with the soil, or come from lateral infiltration of the retaining walls of basement floors. Diagnosis almost always requires a technician, because similar symptoms can hide different causes, from a burst pipe to internal condensation of the apartment.

When the condominium is liable

When the rise is attributable to the ground, the foundations or the load-bearing walls, the works to eliminate it fall within the condominium's competence, because they concern common parts under Article 1117. The related cost is split among all owners in proportion to their thousandths. If, moreover, failed maintenance of the common parts causes damage to an apartment, such as mould on internal walls, the condominium may be called to compensate it as custodian of the asset, under Article 2051.

There is, however, an important limit. The Court of Cassation has excluded the condominium's liability under Article 2051 when the rising damp is mainly attributable to the construction techniques in use at the time the building was erected, that is to an original defect and not to subsequent neglect. In such cases the matter shifts to the plane of building defects rather than that of custody.

When the single owner pays

Not every trace of damp is a common responsibility. If the phenomenon arises from a leaking private pipe, poor ventilation of the rooms or condensation linked to how the apartment is used, the works and the damage remain the owner's responsibility. Here too, proof of the cause is decisive: whoever claims reimbursement or remediation must prove the common origin of the problem.

• Rise from common foundations, crawl spaces or retaining walls: condominium cost by thousandths.
• Damage to a unit from failed maintenance of common parts: possible compensation by the condominium under Art. 2051.
• Original construction defect of the building: custody liability excluded, the rules on defects apply.
• Leak of a private system or internal condensation: works borne by the single owner.

What to do in practice

The correct path starts from the technical assessment: a report identifying the cause, measuring the humidity and proposing the solution, from cutting the wall with a chemical barrier to perimeter drainage, from dehumidification to macroporous plaster. Only after establishing the origin can the meeting be convened to resolve on the common works, or the single owner be told the burden that falls to them. Documenting everything with photographs, measurements and quotes prevents disputes over the split.

The value of traceability

A damp problem is solved better when the building's history is documented: previous infiltrations, works carried out, owners' reports. Having this history at hand helps the technician and the manager read the phenomenon and choose the right solution.

With AmministraPro you can archive technical reports, track reports on the common parts and correctly split remediation costs between the condominium and single owners: discover the features on /funzioni and the plans on /prezzi.