
Installing a plastic skylight can be a great way to increase natural light in your home and potentially reduce lighting and heating costs. The installation process typically involves two phases: rooftop and interior. The rooftop phase includes cutting a hole in the roof and fastening the skylight with the appropriate protection layers to prevent leaks. The interior phase involves drywall work and painting, and the time required for this phase can vary depending on the type of ceiling and the depth and shape of the light shaft. It is recommended to consult a certified installer to evaluate your home's specific needs and determine the best location for the skylight to maximize the benefits of natural light and fresh air.
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What You'll Learn

Phases of installation
The installation of a plastic skylight typically happens in two phases: rooftop and interior. The time taken for installation depends on factors such as roof pitch, interior light shaft depth and shape, and weather conditions. On average, it can take anywhere from half a day to three days to complete the entire installation process.
Phase 1: Rooftop Installation
The first phase involves working on the roof and begins with cutting a hole in the roof. This step should be carried out carefully, considering the size and placement of the skylight. Once the hole is cut, the skylight is securely fastened to the roof. It is crucial to ensure that the skylight is properly sealed to prevent any potential leaks. Quality skylights, such as the VELUX No Leak Skylights, offer three layers of protection against leakage.
Phase 2: Interior Installation
The second phase focuses on the interior portion of the skylight installation. This includes drywall work and painting to seamlessly integrate the skylight into the existing ceiling structure. The type of ceiling, whether vaulted or flat, will impact the time and complexity of this phase. On average, the interior installation takes about half a day per skylight to complete.
Additional Considerations
When installing a skylight, it is important to consider the climate and exposure of your roof. Studies suggest that skylights can provide energy-saving benefits depending on their orientation. For instance, skylights installed on a roof with southern exposure in cooler climates can help reduce heating costs in the winter and lighting costs in warmer months. Conversely, in warmer climates, skylights with a northern exposure can maximise natural lighting and reduce lighting costs. Consulting with a professional skylight installer can help determine the optimal location for your skylight to maximise these benefits.
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Roof type considerations
The type of roof you have will play a significant role in the installation process of a plastic skylight. Firstly, consider the pitch of your roof. A roof with a steeper pitch will require additional safety considerations when cutting the hole for the skylight and during the fastening process. The roof pitch will also influence the depth and shape of the interior light shaft, which is an important aspect of the installation process. If you have a flat roof, you may need to factor in additional considerations to ensure effective water runoff and avoid leaks.
The direction your roof faces is another important factor. For homes in warmer climates, installing a skylight on a roof facing north can help reduce lighting costs by maximizing natural lighting. Conversely, in cooler climates, a skylight on a south-facing roof can reduce heating costs in the winter and lighting costs in the summer. If you live in an area with extreme weather conditions, such as heavy snowfall or strong winds, you may need to choose a skylight model that can withstand these elements and plan the installation during milder seasons.
The type of ceiling you have, whether vaulted or flat, will also impact the installation process and the overall aesthetic of the skylight. Skylights can be installed in both flat and vaulted ceilings, but the time required for the interior installation may vary depending on the ceiling type. Consult a professional installer to assess your specific roof and ceiling type and provide tailored advice for your skylight installation.
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Interior installation
The interior installation of a plastic skylight is a meticulous process that typically takes about half a day per skylight to complete. Here is a step-by-step guide to help you navigate the interior installation process:
Prepare the Ceiling
The first step is to determine the type of ceiling you have—whether it's a flat or vaulted ceiling. This is an important factor because it will influence the time and techniques required for the installation. Once you've identified your ceiling type, you'll need to cut a hole in the ceiling. This step should be performed with precision, ensuring that the hole is exactly where you want your skylight to be and that it's the correct size and shape to accommodate the skylight frame.
Drywall and Painting
After the hole has been cut, it's time to install the drywall. Drywall installation can vary depending on the specific skylight model and your ceiling structure. Make sure to follow the manufacturer's instructions for the best results. Once the drywall is in place, it's time to paint. Choose a paint colour that matches your ceiling to create a seamless and cohesive look.
Final Touches
With the skylight in place, you can now enjoy the benefits of natural light flooding into your home. Depending on your preferences and the model of your skylight, you may want to consider adding shades or blinds to control the amount of light entering the room and to provide privacy when needed.
Professional Advice
It is highly recommended to consult a professional skylight installer, especially if you're unsure about any aspect of the installation process. They can provide valuable insights and ensure that your skylight is installed correctly and safely. Additionally, consider using resources like the VELUX Visualizer app, which allows you to visualise and plan your skylight installation using augmented reality.
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Lighting and climate
The lighting and climate benefits of installing a skylight are significant. Maximising natural light in your home through the installation of a skylight can reduce lighting costs, particularly in homes in warmer climates with a northern exposure, and during the warmer months for homes in cooler climates with a southern exposure.
Skylights can also provide fresh air, and some models can be opened remotely and left open, which is especially useful if you are out during the day. This can be beneficial for your home's climate and air quality, as well as reducing lighting costs.
The direction your roof faces will impact the lighting and climate benefits of a skylight. A skylight installer can advise on your home's specific daylighting needs and recommend the best placement for maximum benefit. For example, a southern-facing skylight will provide more natural light in the winter, reducing lighting costs, and more warmth from the sun, reducing heating costs.
The type of ceiling you have will also impact the installation and benefits of a skylight. Skylights can be installed in flat or vaulted ceilings, and the interior portion of the installation will take around half a day per skylight, including drywall and painting.
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Using the VELUX Visualizer app
The VELUX Visualizer app is an excellent tool to help you decide on the best skylight for your space and style. You can browse their range of skylight products and customise them to your liking. This app ensures you can see how a brighter future with natural daylight and fresh air could look in your home.
With the VELUX Visualizer app, you can explore various skylight options and determine the best fit for your room. The app also offers free virtual consultation services, providing expert advice on utilising skylights for a healthier and more energy-efficient home.
Through this app, you can discover how replacing an old, plastic skylight with a new VELUX No Leak Solar Powered Fresh Air Skylight could transform your space. It will help you visualise the benefits of improved lighting and indoor air quality, taking your home renovation project to the next level.
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Frequently asked questions
There are two phases in skylight installation: rooftop and interior. The rooftop phase includes cutting a hole and fastening the skylight with three layers of protection. The interior phase includes drywall and painting.
Depending on the circumstances, such as the roof pitch, interior light shaft depth and shape, and weather, installations can take between half a day and three days.
Skylights can be installed in both flat and vaulted ceilings.
Consult a skylight installer to evaluate your home's daylighting needs. They can recommend where skylights should be installed so you can maximise the benefit from the natural light and fresh air they provide.











































