Skylight

Light and air

Skylight

Historicrooflight · roof window · dome light · lucernario (Spanish)

housing school warehouse pasillo bathroom

An opening in the roof, closed with glass or another transparent material, that lets in daylight from above.

What it solves

It lights interior rooms, corridors and bathrooms without windows during the day. In the tropics it must control direct sun and heat, which come in strongly through the roof.

Today

Prefer diffuse light with opal glass or polycarbonate with low solar heat gain, with a light well that spreads it. Place it away from the afternoon sun and seal it well against the rain.

Common mistake

Installing clear, unprotected glass in a tropical roof, which brings in heat and glare.

Tomorrow

More natural light in corridors and bathrooms helps older people find their way and not trip. Light tubes bring that brightness to windowless rooms with little heat gain.

Fact On cloudy days, top light yields three to ten times more than light coming in through a side window.

Where it comes from

  • 1Roman architecture Rome, Antiquity
    It used unglazed openings in the roof, such as the oculus of the Pantheon.
  • 2Industrial Revolution Europe, 19th century
    Improvements in glass manufacturing made the closed skylight practical.

Masters

  • Louis Kahn Kimbell Art Museum, Fort Worth, United States, 1972
    He opens a slot of light at the top of each vault and spreads it with a curved screen of perforated aluminum. He achieves even daylight without direct sun on the artworks.
Sources

See also

Also in Light and air

Diagrams and texts by LDB Arquitectura. They are shared under the CC BY 4.0 license, which allows them to be used and adapted with credit to the source.