How to Measure a Velux Window

When it comes to measuring a Velux window, precision is key to ensure a perfect fit and optimal performance. Whether you're a seasoned DIY enthusiast or a professional installer, understanding the correct measurement process is crucial. This guide will walk you through the steps to measure a Velux window accurately, ensuring a seamless installation and enhancing your home's comfort and energy efficiency.

Before we dive into the measurement process, let's briefly discuss why accurate measurements are vital. Velux windows are designed to provide optimal insulation, ventilation, and daylight. However, these benefits can only be realized if the window is installed correctly, which starts with precise measurements. Inaccurate measurements can lead to poor insulation, water leaks, and even structural damage, making it essential to follow the measurement process carefully.

Understanding Velux Window Components

Before measuring, it's crucial to understand the different components of a Velux window. The primary components are the frame, glazing, and any additional features like blinds or remote controls. Familiarizing yourself with these components will help you measure accurately and ensure you order the correct window for your space.

Velux windows come in various sizes and shapes, including rectangular, round, and custom shapes. They also offer different glazing options, such as clear, tinted, or energy-efficient glass. Additionally, Velux provides various installation options, including manual, electric, and solar-powered windows. Understanding these options will help you choose the perfect window for your needs and ensure accurate measurements.

Gathering Your Tools

To measure a Velux window accurately, you'll need the right tools. Here's a list of essential tools you'll need:

• Tape measure
• Pencil and paper
• Level
• Chalk line
• Ladder (for roof measurements)

Having the correct tools ensures that you can take accurate measurements and make precise markings, making the installation process smoother.

Measuring the Rough Opening

The rough opening refers to the space where the Velux window will be installed. Measuring this space accurately is crucial to ensure the window fits perfectly. Here's how to measure the rough opening:

1. Locate the center of the rough opening. This will serve as the reference point for your measurements.
2. Using a tape measure, determine the width of the rough opening by measuring from the inside edge of one side to the inside edge of the opposite side. Record this measurement.
3. Next, measure the height of the rough opening. Start from the center point and measure up to the top of the rough opening, then down to the bottom. Record this measurement.

It's essential to measure both the width and height from the center to ensure accuracy. Additionally, make sure to account for any obstructions or structural elements that could affect the installation.

Measuring for Flashing

Flashing is a critical component of Velux window installations, as it helps prevent water leaks and ensures a tight seal. To measure for flashing, you'll need to determine the size of the flashing required for your window. Here's how:

1. Measure the width and height of the rough opening, just as you did for the window itself.
2. Velux flashing is typically ordered based on the size of the rough opening, not the window. This ensures that the flashing covers the entire opening, providing a proper seal.
3. Record the width and height measurements for the flashing. These measurements should be the same as those for the rough opening.

It's essential to order the correct size flashing to ensure a proper seal and prevent water damage. If you're unsure about the flashing size, consult Velux's flashing size chart or contact their customer support for assistance.

Determining the Window Size

Now that you have the rough opening and flashing measurements, you can determine the size of the Velux window you need. Velux windows are typically measured in inches and come in standard sizes. However, they also offer custom sizes to fit unique spaces. Here's how to determine the window size:

Velux windows are measured based on their external dimensions, which include the frame. To find the appropriate window size, you'll need to subtract the frame width from the rough opening width and the frame height from the rough opening height. Velux provides frame width and height measurements on their website, making it easy to determine the window size.

For example, if your rough opening is 24 inches wide and 36 inches tall, and the frame width is 2 inches and the frame height is 3 inches, you would subtract these measurements from the rough opening dimensions:

Rough Opening	Frame	Window Size
24 inches	2 inches	22 inches
36 inches	3 inches	33 inches

In this case, you would need a Velux window that is 22 inches wide and 33 inches tall.

Accounting for Additional Features

Velux offers various additional features for their windows, such as blinds, remote controls, and rain sensors. If you plan to include any of these features, it's essential to account for them in your measurements. Here's how:

• Blinds: Measure the width and height of the window opening where the blinds will be installed. Velux blinds are typically ordered based on the window size, not the rough opening. However, you'll need to ensure that the blinds fit within the window opening without interfering with the window's operation.
• Remote Controls: Remote controls for Velux windows are typically wired and require a chase or conduit for installation. Measure the distance from the window to the desired location of the control unit to ensure proper wiring.
• Rain Sensors: Rain sensors are typically installed on the exterior of the window and require a clear path for signals. Ensure that the sensor can be mounted without obstruction and that it has a clear line of sight to the window.

Accounting for these additional features in your measurements will ensure a smooth installation and optimal performance of your Velux window.

Measuring for Installation

Once you have the correct window size and have accounted for any additional features, it's time to measure for installation. Velux windows can be installed in various ways, including curb-mounted, deck-mounted, and skylight tunnels. Here's how to measure for each installation type:

1. Curb-Mounted: Measure the width and height of the curb where the window will be installed. The curb should be slightly larger than the window to accommodate the flashing and ensure a proper seal. Velux provides curb size recommendations on their website.
2. Deck-Mounted: Measure the width and height of the deck where the window will be installed. Deck-mounted windows are typically installed on flat or low-pitched roofs. Ensure that the deck is structurally sound and can support the weight of the window.
3. Skylight Tunnels: Measure the width and height of the tunnel where the window will be installed. Skylight tunnels are used to bring natural light into spaces with limited roof access. Measure the width and height of the tunnel, as well as the distance from the tunnel to the desired location of the window.

Accurate measurements for installation are crucial to ensure a proper fit and optimal performance of your Velux window. Consult Velux's installation guides or contact their customer support for assistance if needed.

Measuring a Velux window accurately is a critical step in ensuring a successful installation and enhancing your home's comfort and energy efficiency. By understanding the measurement process and gathering the right tools, you can confidently measure your Velux window and enjoy the benefits of natural light and ventilation for years to come. Happy measuring!