Climate declaration is a term used to describe the reporting of greenhouse gas emissions from the construction industry (Greendesk, 2023). The requirements for climate declaration were introduced on January 1, 2022 (Boverket, 2021). Climate declaration is the first step in the roadmap towards a sustainable, climate-neutral, and competitive construction and civil engineering industry by 2045 (Byggföretagen, 2019).
The purpose of this study was to investigate the difference in using Revit versus an Excel model for conducting climate calculations.
Additionally, the goal was to investigate which of the selected building components had the highest climate impact in the examined building.
To fulfill the study's purpose, a literature review on the topic was conducted initially. Then, an illustrative case study was conducted to compare climate declarations. The building components chosen for this study were an exterior wall, an interior wall in wet rooms, an interior wall, and roof.
The results of the study indicated that the calculated CO2-equivalent values are deviated from a more accurate calculation in Excel. The calculations are deviated because Revit with the current code does not calculate in homogeneous layers and other layers thinner than 1.0 mm. In Revit, the presentation of results typically occurs at a more comprehensive level, providing a summarized view of climate impact for various building components. On the other hand, Excel allows for more detailed calculations, enabling you to analyzeand scrutinize the climate impact for each individual layer used in the construction. The differentiation in presentation offers users different levels of detail depending on the tool used to perform climate calculations.
The study demonstrated that using Revit reduces the required time for the calculations and streamlines the process. However, the calculations in Revit must be supplemented with Excel for the heterogeneous layers and other layers with thickness less than 1.0 mm as in the case of the roof.
2024.