| Summary: | The sustainability of building envelopes is affected by its windows, since these establish the connection/separation between the indoor rooms and the external environment. They can also lead to problems if they do not offer sufficient protection against external agents. The data source in this research is unprecedented, as it is based on records of court sentences. There is a significant number of cases (1615), which provides high representativeness for the functional reality of windows. The methodology that was developed classifies the defects and the causes that were found, also analysing correspondence with their recurrence according to aspects of climatological location. In the results, the cases pertaining to water infiltration, air permeability and humidity by condensation are highlighted. This study provides a vision that categorizes problems related to aluminium windows that may be useful for future interventions by agents participating in the construction process.
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