lucernari

Lucernari are openings in roofs or ceilings that admit daylight and, in many cases, provide ventilation. Covered by transparent or translucent glazing and framed to integrate with the roof structure, they can be fixed or operable. The term is Italian and commonly used in architectural contexts to refer to skylights.

Common types include fixed skylights (light only), operable skylights (ventilation), and tubular skylights that channel daylight through an optical conduit. In design, lucernari may be integrated with roof lanterns or be part of a larger skylight system.

Design and performance considerations include daylight distribution, glare control, thermal performance, and water sealing. Glazing choices (tempered, laminated, low-emissivity coatings) affect heat transfer and comfort. Shade devices and proper orientation help manage solar gains, while insulation and flashing contribute to energy efficiency and weatherproofing.

Materials and construction: glazing options include glass and plastics such as polycarbonate or acrylic. Frames are typically aluminum, wood, or PVC. Waterproofing relies on flashing, seals, and appropriate roof slope alignment to prevent leaks.

Installation and maintenance: correct flashing and sealing are essential to prevent leaks. Regular cleaning and gasket checks preserve performance. Building codes often regulate skylight installation, including size, safety, venting, and, in some cases, emergency egress requirements.

History: skylights have ancient antecedents in light wells and ocular openings. In European architecture, lucernari helped illuminate interior spaces without relying on wall openings, with modern variants offering improved insulation and daylighting efficiency.