Estimating the material intensity of wooden residential houses in Finland

• Published in: Resources, conservation and recycling conservation and recycling, 2023-11, Vol.198, p.107142, Article 107142
• Main Authors: Nasiri, Bahareh, Kaasalainen, Tapio, Hughes, Mark
• Format: Article
• Language: English
• Subjects: Building material; environmental impact; Finland; inventories; Inventory data; Material intensity; Residential building
• ISSN: 0921-3449; 1879-0658
• DOI: 10.1016/j.resconrec.2023.107142

•About 88% of the MI in Finnish wooden houses comes from concrete.•Construction method, GFA and footprint shape significantly affect MI.•The number of storeys in 1–1.5 storeys buildings does not significantly impact MI.•The variability in MI within each building typology should be accounted for.•Comparing of MI faces challenges due to a lack of harmonized data and methods. Improving resource efficiency in the building sector is a significant challenge, largely due to a lack of knowledge about material usage in buildings. Material intensity (MI) quantifies materials used in buildings, normalized by floor area or volume. MIs serve as indices for material stock and flow models and as an inventory approach for assessing the environmental impact of the built environment. Therefore, this study aimed to determine MIs of Finnish wooden residential houses built between 1940 and 2010 due to the dominance of them in residential building stock and their demolition rates. Factors influencing MI and cross-country comparisons were also explored because they had not been explored enough in the literature. Results showed construction method, time cohort, floor area, design choices and footprint shape impacted MI. Accounting for variability of MI was recommended, particularly when using it for material stock and flow analysis. Data and method disparities restrict cross-country comparison of MI. [Display omitted]