Abstract
Façade claddings are expected to be particularly vulnerable to climate change impacts, since they are directly exposed to the action of environmental agents. This study is part of a methodology to quantify the effect of changes in climate parameters on the future degradation of rendered façades, which can be useful in the context of adaptation to climate change. It highlights the influence of temperature and precipitation (independent variables) on the mean triennial degradation rate (ΔSw,mt), global and per type of defect (dependent variables), during the period 1990–2020, assessed through statistical analysis. The sample comprises 26 rendered façades in Lisbon, Portugal. According to the negative correlations between variables and to their historical trends, the degradation evolution of the sample (i) globally and due to stains and loss of adhesion, tends to deaccelerate with the increase in ‘maximum temperature’ and ‘number of warm days’, and (ii) due to cracks, tends to accelerate with the decrease in ‘number of wet days’. The influence of ‘maximum temperature’ on the degradation evolution of the external renders is the most significant within the climate variables. The contribution of stains is the most representative of the global ΔSw,mt. Therefore, the warming projected for the end of the century is expected to contribute generally to lessening the rate of rendered façades’ degradation in the future, in Portugal or analogous areas of the Mediterranean. Further research is necessary concerning the projection of rendered façades’ future degradation, based on the climate change signal for the same climate variables.
Published Version
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