Peruspoisto

Peruspoisto is a Finnish term used in civil engineering and construction to describe the removal of the base or foundation layer of a structure or road as part of renovation, upgrading, or remediation projects. The operation aims to reach a stable underlying subsoil or to replace degraded base materials with new layers that provide adequate bearing capacity and drainage. It is commonly applied in road reconstruction, building foundations, and other excavation projects where the existing base course or subbase must be removed and replaced.

The decision to perform peruspoisto depends on factors such as structural condition, drainage performance, contamination, and load requirements. Planning typically includes site investigation, soil testing, and assessment of the depth and extent of the material to be removed. The actual work uses heavy excavation equipment, such as excavators and loaders, and may involve milling or trimming of surfaces in road contexts. After removal, the underlying layer is prepared for new material placement, compaction, and, if necessary, drainage improvements before reinstatement.

Environmental and safety considerations are central to peruspoisto. Excavated material must be classified and managed according to local waste regulations; reusable or recyclable material is preferred where feasible. Measures to control dust, noise, and groundwater impact, as well as traffic management and worker safety, are standard parts of the process. Permits and coordination with public authorities are often required in infrastructure projects.

In practice, the term denotes a specific phase within broader rehabilitation or redevelopment work, and its exact meaning can vary depending on project scope and regional construction practices.