Exploring Material Lifespans in Danish Architectural Heritage - Using the Building Historical Investigation to Discuss and Qualify LCA in the B and C-Stages

Abstract

Life Cycle Assessment [LCA] is becoming mandatory in the Danish construction sector, including works on existing buildings. Whereas calculations regarding the material extraction, production and transportation offer precise data, it is difficult to predict human behaviour in regard to energy consumption and maintenance and thus, provide exact data on the service life. Concurrently, many heritage buildings are statutorily agreed upon as not having an end-of-life and moreover, such buildings show that materials and components have very different lifespans.
 

This article examines the method of Building Historical Investigation [BHI] in heritage buildings as a means to discuss and qualify material lifespan scenarios in LCA. Initially, the study establishes a frame of understanding based on LCA and BHI. Then, the case study of the listed building, Agerskov House, is analysed with a focus on the load-bearing structure, the roof, the doors and windows and their age. These investigations frame the discussion, which evaluates on the chosen methods, elaborates on the findings and examines these in relation to the standard assessment of material lifespan. The article concludes that bulking findings from BHI could qualify the understanding of material lifespan in LCA and differentiate the formation of multiple scenarios.