To achieve a service life of over a century, following best practices and guidelines during the design and construction phases is essential while considering the conditions the structures will face. Particular attention must be given to the materials used in load-bearing elements, such as beams, columns, and wall components, along with meticulous project management during construction.
The EN 1990 Eurocode allows for the design of wooden structures with a service life exceeding 100 years, provided that structural loads caused by environmental factors such as wind, snow, and ice are accounted for with higher safety factors. For instance, in Finland, environmental loads are increased by 10% for structures with a service life of over 50 years and 20% for those with a service life exceeding 100 years. In practice, this means that the dimensions of load-bearing walls and roof structures are increased by 5–10%.
From a real estate developer’s perspective, designing a building for a 100-year lifespan instead of 50 years requires a modest increase in material costs. However, this investment brings significant long-term cost benefits. A longer lifespan reduces the need for demolitions and new construction, which are extremely capital-intensive and environmentally taxing. Additionally, buildings with a 100-year design cycle often retain higher property value and attract long-term tenants or buyers looking for durable, sustainable investments. Maintenance costs are also optimised, as fewer major renovations or structural reinforcements are needed over time.
Wood is nature's building material and offers numerous advantages over traditional materials. Laminated veneer lumber (LVL), such as Kerto® LVL, is a wood product that combines excellent performance with durability. It can be used in both wooden and hybrid structures.
The manufacturing process of Kerto LVL involves several stages, including drying veneers, glueing them, and pressing them under high heat and pressure. This process enhances the mechanical properties of wood, such as strength and stiffness, making it an ideal material for load-bearing structures. Moreover, LVL minimises material waste and improves construction efficiency.
Wood is a renewable, recyclable, and, when designed correctly, reusable material that stores carbon throughout its lifecycle. Using wood products as building materials can help mitigate climate change. For example, one cubic meter of Kerto LVL stores approximately 789 kg of CO2 equivalent.
Maintaining buildings and ensuring favourable conditions for wooden structures are key factors in their longevity. Maintenance includes regular inspections, servicing, and repairs to prevent damage and extend the service life of the structures.
