Effects of climate change on rendered façades: expected degradation in a progressively warmer and drier climate — a review based on the literature

Barrelas, Joana; Silva, Ana; De Brito, Jorge; Tadeu, António

Informações chave

Autores:

Barrelas, Joana (Joana Alexandra Mirante Barrelas); Silva, Ana (Ana Filipa Ferreira da Silva Cigarro Matos); De Brito, Jorge (Jorge Manuel Caliço Lopes de Brito); Tadeu, António

Publicado em

Janeiro 2023

Resumo

Climate change could have a significant impact on buildings if its effects are not properly recognized. The consequences of climate action should be considered at the design and maintenance planning stage, with the objective of promoting the overall durability of constructions. Portugal, being part of the Mediterranean region, Southern Europe, and the Iberian Peninsula, and sometimes highlighted in projections as a critical area, is an example of a country considerably vulnerable to climate change impacts. The climate is expected to become warmer and drier, with a substantial rise in temperature and fall in precipitation by the end of the century. What implications will these changes have on the degradation of façades? Climate agents, such as temperature, solar radiation, humidity, precipitation, and wind, directly influence the performance of external claddings that protect internal building components. Cement render is the prevalent façade cladding in Portugal and Europe. Research to assess the risks of future climate-induced degradation on rendered façades is relevant in the context of buildings’ durability and adaptation to climate change. The objective of the present research was to define expectations about the impact of a progressively warmer and drier climate on the degradation of exterior cement renders, based on an analysis of related literature. Generally, less staining and more cracking are expected. Expectations about salt weathering and loss of adhesion are more uncertain and need further research.