Dakovergangen

Dakovergangen is the junction where a roof meets a wall, encompassing the edge details that ensure weatherproofing and drainage. The term is used in Norwegian and related Scandinavian languages to describe the transition at eaves, roof edges, and where the roof planes connect with the facade. The primary functions are to protect the building envelope from water intrusion, wind-driven rain, and heat loss, while directing roof runoff into drainage systems.

Key components of a dakovergangen include the eaves or overhang, soffit and fascia boards, gutters and downpipes, drip edges, and the flashing and waterproofing membranes that seal joints between roof and wall. Details vary with roof type: pitched roofs emphasize flashing at wall joints and roof edges, while flat or low-slope roofs focus on parapets and edge flashing. Materials used range from metal flashing (aluminium, zinc, copper, galvanized steel) and bituminous membranes to PVC and rubber, applied over or between timber or masonry substrates. The design must accommodate insulation, vapour barriers, and ventilation to minimize condensation and thermal bridging.

Construction considerations include ensuring proper roof slope and drainage, continuous and properly lapped membranes, correct overlap at joints, and secure sealing around penetrations such as vents and chimneys. Material compatibility is important to prevent corrosion or staining, and attention is required for expansion, contraction, and wind uplift, especially in exposed locations.

Maintenance involves regular inspection of flashing, seals, gutters, and soffits, with prompt repair of any cracks, rust, or leaks. Building codes typically require a durable weatherproof transition and adequate drainage, with considerations for fire safety and insulation performance at the roof edge. See also roofing, flashing, eaves, parapets, and drainage.