Abstract

This paper examines the environmental and financial impact of façade renovation strategies designed for change and how taking into account each of these aspects will lead to different renovation decisions. In a first part of the paper the optimal construction method for different façade renovation strategies is searched from the environmental point of view. This is done through life cycle analysis (LCA). In a second part of the paper the financial impact of the results obtained with LCA is determined. This is done with life cycle costing (LCC). The results show that although both LCA and LCC are life cycle studies that follow similar principles and boundaries this does not mean that LCA and LCC based decisions will coincide. For the environmental score the operational energy of a building has the largest impact and energy efficiency measures will often be beneficial. For the financial cost the investment cost is the most important impact and energy efficiency measures will only pay off to a certain extent. Decisions that are based solely on the financial cost may thus lead to sub-optimal solutions from an environmental point of view.

Highlights

  • A large part of the Belgian residential building stock is outdated and does not comply with the present energy standards, resulting in a huge environmental impact

  • To really assess the entire environmental impact of a building it is important to look further than the operational phase and to take the whole life cycle of a building into account. This is possible with life cycle analysis (LCA)

  • ETICS does not qualify as a dynamic construction method, this strategy is researched because it is the renovation strategy that was executed for Building IV

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Summary

Introduction

A large part of the Belgian residential building stock is outdated and does not comply with the present energy standards, resulting in a huge environmental impact. To really assess the entire environmental impact of a building it is important to look further than the operational phase and to take the whole life cycle of a building into account. This is possible with life cycle analysis (LCA). This is done through life cycle costing (LCC) In this paper both the environmental and financial impact of renovation strategies are examined. Taking into account both these aspects results in a more comprehensive approach for assessing renovation strategies. The DFC strategy is a key principle in evolving towards a circular construction sector

Methodology
Façade renovation strategies
Research steps LCC study
Research steps LCA study
Boundary conditions
LCA study
Optimal wall constructions
Optimal insulation thickness
Comparison wall constructions
Optimal façade construction
LCC study
Pareto front optimal façade construction
Sensitivity analysis economic parameters
Conclusion and remarks

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