Ulkoverhouksen

Ulkoverhousen, the exterior cladding, refers to the outermost layer or finish applied to the exterior walls of a building. It is designed to protect structural elements from weather, contribute to thermal performance, and shape the building’s appearance. In modern Nordic construction, ulkoverhous is commonly installed as part of a ventilated façade, where an air gap behind the cladding allows moisture to dry and helps manage thermal expansion. The possessive form ulkoverhouksen is used in Finnish phrases referring to the exterior cladding.

Common materials include timber siding (boards or tongue-and-groove panels), fiber cement boards, brick or brick veneer, metal panels (aluminium or steel), and vinyl siding. The choice depends on climate, maintenance needs, cost, and architectural intent. The outer layer is typically fixed to a substrate with a drainage plane and a weather barrier to prevent water ingress, while a vented gap reduces moisture buildup and improves durability.

Installation considerations include detailing at corners, openings for windows and doors, and transitions to other wall finishes. Joints are sealed to minimize air leakage while preserving the ventilated cavity, and fasteners should be corrosion-resistant and rated for exterior use. Insulation and vapor control are usually installed behind the cladding as part of the building envelope.

Maintenance involves inspecting for damage, rot, or corrosion, repainting or resealing timber when needed, cleaning to remove dirt and algae, and replacing damaged panels promptly. Regular checks help maintain energy efficiency and prevent moisture-related degradation.

See also: building envelope, rainscreen, weatherproofing.