A key component of contemporary construction is natural light, and skylights are a great way for homeowners to improve the aesthetics and usability of their homes. Although skylights are usually seen on sloped roofs, flat rooftops can also have them installed successfully.
In this blog post, we’ll answer the question: Can you install a skylight on a flat roof? We’ll also look at the different kinds of skylights that you can choose for your home.
The Main Question: Can You Install a Skylight on a Flat Roof?
Yes, you can install a skylight on a flat roof, but careful planning is required to ensure it functions properly and to avoid potential issues like water damage. Choosing the right type of skylight is essential, as it should be designed to prevent water from pooling around the frame.
Additionally, using proper installation techniques, such as custom flashing and ensuring adequate structural support, is crucial to prevent leaks and over-ventilation. To ensure a successful installation, it’s highly recommended to consult with a licensed professional.
Some Factors To Consider Before Installing Skylights On Your Flat Roof
Before you move forward with getting a skylight for your flat roof, there are some factors to consider:
1. Proper Slope
Even flat roofs need a slight slope to prevent water pooling. A pitch of at least ¼:12 helps water drain away, reducing the risk of leaks.
2. Waterproofing
Waterproofing is key for flat roofs. Flashing seals the skylight edges to prevent water from seeping in, and a pro installer ensures it’s done right.
3. Roof Load
Check if your roof can support the added weight of a skylight, especially if it’s large or older, to ensure safety.
4. Roof Material Compatibility
Different roof materials have different durability levels. Make sure the skylight is compatible with your roof for a secure, lasting fit.
Types of Skylights Suitable for Flat Roofs
Thinking about getting flat roof skylights for your home or building? Here is a list of the top skylights for flat roofs that you can go for:
#1. Bubble or Dome Skylights
Often referred to as dome skylights, bubble skylights have a rounded design that helps diffuse light and reduce glare. Their shape allows rainwater to drain efficiently, minimizing the risk of leaks. Made from durable materials like acrylic or polycarbonate, these lightweight and impact-resistant skylights are ideal for flat roofs, providing long-lasting performance with minimal maintenance.
#2. Curb-Mounted Skylights
Curb-mounted skylights are one of the best skylights for flat roofs due to their raised design, which enhances drainage and prevents water pooling. Positioned above the roofline, they reduce debris buildup and minimize the risk of leaks, ensuring long-term durability. These skylights also maximize natural light and ventilation, combining practicality with a modern look that complements flat roof designs beautifully.
#3. Fixed or Closed Skylights
The next option, fixed skylights, are designed to stay closed permanently, offering a steady stream of natural light without ventilation. Typically crafted from glass or acrylic, they are perfect for spaces where airflow isn’t needed. These skylights enhance the room’s look while providing plenty of sunlight, and their simple design makes them an affordable and easy-to-install option for flat roofs.
#4. Vented Skylights
Vented skylights offer the flexibility to open, allowing fresh air to enter and improve ventilation. They can be manually or remotely operated, often with rain sensors to close automatically if it rains. Ideal for spaces like kitchens and bathrooms where moisture buildup is a concern, vented skylights provide both natural light and improved airflow for flat roofs.
#5. Tubular Skylights
Also known as sun tunnels, tubular skylights feature a small dome on the roof connected to a reflective tube that channels sunlight into interior spaces. They are perfect for areas where traditional skylights might not fit, such as hallways or closets. Their compact design makes them well-suited for flat roofs, providing bright, energy-efficient lighting with minimal roof modifications.
#6. Flat or Walkable Skylights
With a sleek, low-profile design, flat skylights sit flush with the roof’s surface, letting natural light flood in without disrupting the roof’s aesthetic. Made from glass or acrylic, these skylights blend seamlessly into modern roof designs. Proper installation is key for ensuring drainage, but once in place, flat skylights offer a stylish and practical solution for flat roofs.
#7. Pyramid Skylights
Pyramid skylights have a geometric design with sloped sides that meet at a peak, promoting effective water drainage. Available in various sizes and materials, they provide generous natural light while adding architectural interest to flat roofs. In addition to enhancing the look of a space, their design also helps with heat distribution, making them a great option for both residential and commercial properties.
Proper Installation Techniques For Installing Skylights On A Flat Roof
Here are some techniques to follow when installing a skylight on the flat roof of your home:
1. Pick the Best Spot
Select a location on the roof that allows proper drainage to avoid water pooling. Placing the skylight away from the roof’s lowest points helps prevent leaks and ensures durability.
2. Seal Properly with Flashing
Flashing is essential for preventing leaks. Properly sealing the skylight and curb edges keeps moisture out and protects the roof in all weather conditions.
3. Add Insulation
Insulation around the skylight reduces heat loss and prevents condensation. This step improves energy efficiency and helps maintain comfortable indoor temperatures.
4. Ensure Structural Support
Assess your roof’s capacity to handle the skylight’s weight. If necessary, reinforce the structure to prevent sagging or damage over time, ensuring long-term safety.
5. Pick the Right Skylight
Choose the skylight type that fits your needs—fixed for light, operable for ventilation, or tubular for small spaces. Each option serves a specific purpose, so select carefully.
6. Time It Wisely
Scheduling skylight installation during roof replacement or repairs ensures proper integration and waterproofing. If done separately, aim for favorable weather conditions to avoid complications.
7. Hire Experts
Professional installers have the expertise to ensure a watertight, code-compliant skylight that performs well and lasts for years.
What Is The Cost Of Installing A Skylight On A Flat Roof?
The total cost averages around $1,900, with a range of $1,000 to $2,800. The cost of installing a skylight on a flat roof typically ranges from $300 to $2,500 for labor. For materials, fixed skylights generally cost between $200 and $900 while vented options range from $400 to $2,000 each.
Keep in mind that additional costs may arise depending on the brand and any custom features you choose.
How To Install A Flat Roof Skylight?
Here is a simple step-by-step guide on installing skylights on a flat roof:
1. Choose the Skylight
Opt for a skylight suitable for flat roofs to prevent water pooling.
2. Prepare the Area
Pick a location between rafters (16 to 24 inches apart) for better support.
3. Cut the Opening
Measure and cut the roof slightly larger than the skylight frame.
4. Build the Frame
Construct a frame or curb with a slight slope for drainage.
5. Add Flashing
Install flashing around the curb to ensure a watertight seal.
6. Set the Skylight
Secure the skylight on the curb with screws or brackets.
7. Seal the Edges
Apply sealant around the skylight for waterproofing.
8. Test for Leaks
Check for gaps or leaks by running water over the skylight.
Can You Install Skylights On Your Flat Roof On Your Own, Or Is Professional Help Needed?
While installing a skylight yourself is possible, it’s generally best to seek professional help. Professionals can ensure proper fitting and sealing, preventing leaks and damage from incorrect installation. They also have the necessary expertise and safety equipment to work safely at heights. While DIY may seem appealing, hiring experts saves time, ensures quality, and protects your investment in the long run.
Get Expert Skylight Installation for Flat Roofs With All Around Roofing, Siding & Gutters
Worried about leaks or water damage? All Around Roofing, Siding & Gutters is here to help with your flat roof needs, including skylight installation. Our experienced team handles installation, repair, and maintenance to ensure your roof lasts. Whether it’s for a commercial or residential property, we provide quality flat roofing services tailored to you. With expert craftsmanship and top materials, we promise a durable, watertight roof to protect your property for years. Call us today at (937) 902-2839 for an instant quote!
