pohjustus

Pohjustus is a Finnish noun meaning the foundation, basis, or justification for something. The term is used in various contexts, most commonly to refer to a preparatory layer applied to a surface before finishing coats, and more generally to the rationale or grounds supporting a claim, decision, or argument.

In coatings and construction, pohjustus refers to the primer layer that improves adhesion of subsequent paints or finishes, seals the surface, and provides a uniform base. It is typically applied after surface preparation such as cleaning and sanding, and before the main coat. Types include water-based and solvent-based primers, and choices depend on surface material (wood, metal, plaster, drywall).

In legal, administrative, and academic contexts, pohjustus denotes the justification or grounds for a decision or assertion. A decision's pohjustus consists of the factual findings and legal or policy bases upon which the outcome rests; in writing, it is the explanation that supports the claim or conclusion.

Related terms include peruste (reason), perustelu (justification), and pohja (base/poundation).