Abstract The construction industry is one the most important supply chains regarding social, economic and environmental aspects. This industry creates Jobs, has a significant share of Gross Domestict Product and it supplies the demand for the built environment. On the other hand, it causes negative environmental impacts throughout its supply chain. Improve its economic and environmental efficiency is a hard but urgent task that demands to apply tools and methods that support quantifying of environmental impacts and choosing more sustainable options.The objective of this research is to develop a Parameterised Technological Model (PTM) applied to the Life Cycle Assessment (LCA) of External and Internal Wall System (EIWS), considering standardised performance requirements. The methodology followed these steps: (i) theoretical foundation; (ii) survey of State of Art; (iii) definition of building subsystem to be studied, which is the EIWS, and which type of wall will be the target of the PRM; (iv) compilation of performance requirements of walls considering Brazilian and British standards; (v) characterisation of the wall typologies that meet standard performance requirements/ (vi) characterisation of the supply chain to build walls; (vii) development of the PTM, by parameterising the Life Cycle Inventory and definition of design parameters; (viii) definition of analysis contexts, by combining parameters; and (ix) analysis of results, comparisons and gaps of the PTM application. During the application of the PTM we observe that in the first context of analysis, which compares two typical Brazilian typologies with different design parameters, that the typology that uses less resources has better environmental performance. The second context of analysis has essentially only two design parameters modifies: the type of brick and the nationality, which allows to evaluate better the functionality and importance of parameters and shows that the British typology applied in Brazil has a better environmental performance when compared to its application in United Kingdom, considering the performance requirements for each country. With this research, we conclude that the PTMs are applicable to the Construction Industry, especially for the External Walls that were tested in this thesis. The parameterisation is essential to develop LCAs, evaluating potential impacts since the design stage, simplifying the understanding of a large amount of data and information and identifying factors that influence more significantly the product environmental impact. We also conclude that LCA is poorly disseminated in Brazil and that new works need to be developed in this field to augment the national inventory and make future LCAs easier and more precise, insofar as more data parameters and information are available. Keywords: Life Cycle Assessment, Parameterised Technological Model, Wall, Performance Requirements.
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