Flat Roof Skylight Options: Fixed vs. Vented Skylights

Published On: July 3, 20230 Comments on Flat Roof Skylight Options: Fixed vs. Vented SkylightsTags: Last Updated: January 28, 20243.2 min read

The decision to install a skylight is often driven by the desire for more natural light, improved ventilation, or simply an aesthetic upgrade. It’s an impactful choice that can dramatically transform the ambience of your interior spaces. However, one size does not fit all when it comes to roof windows, especially for skylights for flat roofs.

vented skylights

The two primary skylight options are fixed and vented skylights, each having its own advantages and considerations.

Understanding Skylights

Skylights are essentially windows for the roof. They serve to bring natural light into buildings and add an architectural flair to the design. By allowing sunlight to infiltrate spaces, they can improve the occupants’ mood, increase the perception of space, and even reduce electricity costs by decreasing the need for artificial light during the day. Their value extends beyond aesthetics, making them an excellent addition to many architectural designs.

Overview of Flat Roofs

Flat roofs are defined by their minimal slope, usually not exceeding 10 degrees. They provide a modern aesthetic and practical advantages such as additional outdoor space. However, when installing skylights on a flat roof, careful consideration must be given to the skylight type and installation method to ensure proper sealing, drainage, and performance in varying weather conditions.

Fixed Skylights

Fixed skylights are stationary and do not open for ventilation. They are designed solely to allow light into the building. This simplicity makes them highly efficient at sealing against weather elements and can reduce the chance of leakage. A key benefit of fixed skylights is their ability to brighten rooms with natural light without compromising the building’s thermal insulation. On the other hand, their main drawback is that they provide no ventilation, which could potentially contribute to indoor humidity in certain conditions. Fixed skylights are an ideal choice for rooms where additional light is desired without the need for extra ventilation, such as closets or hallways. Several stunning examples can be found in modern architecture, beautifully illuminating spaces with their stationary design.

fixed skylights

Vented Skylights

Vented skylights, also known as ventilating skylights, can be opened to allow airflow in addition to light. They can either be manually operated or motorized for ease of use. Vented skylights offer the added benefit of ventilation, aiding in temperature regulation and reducing the risk of condensation. However, they are more complex to install and maintain due to their moving parts, and the potential for leakage is slightly higher than fixed skylights due to their ability to open. Vented skylights are an excellent option for rooms where both light and additional ventilation are required, such as kitchens or bathrooms. Despite the slightly higher complexity, their ability to improve indoor air quality makes them a popular choice for many homeowners.

Choosing Between Fixed and Vented Skylights

Choosing between fixed and vented skylights often comes down to weighing the benefits of additional light against the need for improved ventilation. A cost-benefit analysis is useful, but other factors such as the room’s purpose, local climate, and personal preference also come into play.


Whether you opt for a fixed or vented skylight for your flat roof, your choice will undeniably have a profound impact on the functionality and aesthetics of your space. Both options have their merits, and the best choice depends on your individual needs and circumstances. Consulting with professionals is always a wise step in making an informed decision.

If you’re considering a skylight for your flat roof, HiSky LTD, located at Unit 3F, ManorWay Business Park, Swanscombe DA10 0LL, United Kingdom, offers a range of skylight solutions tailored to your needs. They have a team of experts ready to assist you in choosing and installing the right skylight for your space. You can reach out to them at 447714991494 for expert advice and quality service.

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