Konsekvensanalys för framtidens putsfasader

Sammanfattning

Residence in Härnösand is a historical treasure that has required careful management and maintenance over the last century. The building's facade, made of plaster, has undergone several renovations in the past century, which has incurred significant costs. Originally constructed with lime plaster, renovations have used lime-cement plaster, which changes the building's original conditions. The facade has developed cracks, likely due to humidity issues and weathering, which have also affected the load-bearing brickwork in some areas. To address these challenges, a study was conducted to investigate various plaster materials and the possibility of additional insulation to reduce humidity levels.The study aimed to compare hydraulic lime and lime-cement plaster in terms of their environmental impact and lifespan. Through life cycle analysis (LCA) and humidity calculations, suitable solutions were identified for the residence's facade and similar buildings, considering legal requirements and sustainability aspects.Collaboration with Statens fastighetsverk (SFV) and literature studies formed the basis for thorough analysis of the consequences of different plaster materials. The integration of various methods and investigations has contributed to increased knowledge in the field and provided valuable insights for future material choices for similar buildings.For buildings without historical significance, where there are no specific regulations to address, the choice lies between lime-cement plaster and hydraulic lime plaster with insulation. Both options have their advantages, and it is important to make a careful assessment. Studies show that lime-cement plaster performs best according to LCA, while hydraulic lime plaster with insulation has demonstrated superior results in moisture calculations. However, it is important to note that the environmental impact differs between the two alternatives, with a difference of 4000 kg carbon dioxide equivalents (CO2e) according to LCA results.