täyspäällystetyt

Täyspäällystetyt is an adjective form used in Finnish to describe surfaces, structures, or pathways that are completely covered with an outer layer or pavement over the entire area. In civil engineering and construction, täyspäällystetty or täyspäällystetyt refers to surfaces that are fully clad with materials such as asphalt, concrete, paving stones, or other durable coverings, leaving no exposed substrate on the surface.

Linguistically, the term is formed from täysi (full), päällyste (surface or pavement), and the participial suffix -etty, with the plural -t, yielding täyspäällystetyt. It is commonly used in Finnish planning, road maintenance, and building descriptions to distinguish completely surfaced installations from partially surfaced or unpaved ones.

Typical contexts include roads, driveways, walkways, airport aprons, and courtyards where the entire surface has been paved or clad. The designation is often used in project specifications, surveys, and inventories to indicate the degree of surface coverage and to compare with partially paved (osapäällystetyt) surfaces.

Advantages of full paving can include improved durability, weather resistance, smoother ride quality, and simpler maintenance and cleaning. Drawbacks may involve higher initial costs, drainage considerations, and potential urban heat effects if materials are not chosen with climate in mind.

Related terms include päällyste (surface/pavement) and osapäällystetyt (partially surfaced). The concept is relevant in road construction, parking areas, and other built environments where surface coverage is a design criterion.