How To Install A Skylight On A Flat Roof?

Skylights are windows installed on flat roofs to let in natural light. They are typically glass or plastic domes that sit raised above the roof to allow light through while preventing leaks. Skylights brighten rooms below without the need for artificial lights during daytime. Installing a skylight on a flat roof let's natural light into rooms below. But how to install a skylight on a flat roof correctly? Proper placement and sealing are key. Leaks can damage a roof. Following key steps carefully makes installation safe and effective. Proper skylight placement maximizes light and minimizes leaks. North facing skylights get the most natural light during the day. Locate between rafters to simplify framing and improve support. Allow at least 18 inches around all sides for safe access and sealing. Positioning matters for best skylight performance.

Types Of Skylights Suitable For Flat Metal Roofs

Fixed Skylights: These skylights don't open and are sealed shut, making them ideal for flat roofs where ventilation isn't a priority. They are low-maintenance and provide a sleek, modern look. Curb-Mounted Skylights: Designed to be mounted on a raised curb above the roof surface, these skylights work well with flat metal roofs. The raised curb helps in preventing water pooling and ensures proper drainage.

Installing The Skylight On A Flat Metal Roof

Position the skylight over the cut opening in the metal roof, ensuring a precise fit. Secure the skylight in place using roofing screws and follow the manufacturer's instructions for sealing and flashing. Apply roofing adhesive or sealant around the edges for waterproofing, and check the skylight for proper alignment using a level.

Sealing The Skylight To Ensure Proper Insulation

Apply roofing adhesive or sealant around the edges of the skylight opening to ensure a watertight seal. Use a flashing kit designed for flat roofs to cover the sides and top of the skylight, providing additional waterproofing. Press the flashing firmly into place, securing it with roofing screws to prevent leaks and ensure proper insulation.

Velux Flat Roof Skylight Installation Instructions

Preparation: To install a Velux flat roof skylight, start by preparing the roof surface. Ensure the area is clear of debris and measure the desired location for the skylight. Follow Velux's specific guidelines for selecting the appropriate skylight size and style. Installation Process: Apply the provided roofing adhesive around the skylight's perimeter, then secure it in place with Velux-approved screws. Use the included flashing kit to ensure proper waterproofing.

Can you put skylights on a flat roof? Yes, skylights can be installed on a flat roof, but it requires careful planning to ensure proper waterproofing and structural support. Consult with a professional to determine the best approach for your specific flat roof construction. Can you have skylights with a flat ceiling? Yes, skylights can be installed in a flat ceiling, providing natural light and an open feel to the space. Proper installation ensures they integrate seamlessly with the ceiling surface. What pitch should a skylight be on a flat roof? Skylights on a flat roof should ideally have a minimal pitch of 2% to allow proper drainage of water. Some flat roof skylights are designed for a completely level installation.

Frequently Asked Questions


Skylights let natural light into dark rooms. But improper installation causes leaks or even roof failure. Follow skylight instructions precisely. Waterproof all seals and attachments. Test for leaks before finishing the ceiling. Correct any gaps or cracks immediately. Well-placed skylights brighten rooms for less cost than new windows. Getting the placement right from the start saves time and money. Preparing the roof properly makes sealing effective. Taking care at each step leads to years of sunlight with no drips inside. The effort opens a new space full of natural glow.