A skylight is a window installed in a roof rather than a wall, admitting natural light from above and, in operable versions, providing ventilation, particularly valuable for interior rooms lacking sufficient wall space for conventional windows or for adding dramatic natural light to any space.
Because a skylight penetrates the roof surface, one of a home’s most critical waterproofing systems, proper flashing and installation quality are absolutely essential to preventing leaks at this genuinely demanding roof penetration.
Skylight glazing technology has advanced considerably, with modern units offering Low-E coatings, multiple panes, and various tinting options to manage solar heat gain, addressing a historical concern about skylights contributing to excessive summer heat.
What Does a Skylight Involve?
- A glazed unit installed within the roof structure
- Extensive flashing integrating with the surrounding roofing material
- Fixed or operable configurations
- A light shaft connecting the roof opening to the ceiling below
Why Are Skylights Important?
Skylights can dramatically improve natural light in spaces that would otherwise rely entirely on artificial lighting or limited wall windows, offering genuine daylighting benefits that can also reduce electric lighting energy use during daytime hours. This lighting benefit, combined with the dramatic visual effect skylights can create, has sustained their popularity despite the added installation complexity and leak risk they introduce.
Because skylight flashing represents one of the more demanding roof penetration details, working with an experienced, reputable installer, and choosing quality flashing kits specifically designed for the roofing material involved, matters enormously for avoiding the leak problems that have historically given skylights something of a troublesome reputation.
Skylight vs. Roof Window
A skylight is typically fixed or has limited opening capability, mounted higher on the roof plane. A roof window is generally larger, more fully operable, and mounted lower, sometimes at a reachable height for regular use as both a light source and functional window.