Velux FCM Installation Instructions

How to Install Velux FCM Skylights

Installing a Velux FCM skylight can be a rewarding project that brings natural light and a fresh look to your home. Velux products are renowned for their quality and ease of installation, and Velux FCM Curb Mounted Skylights are no exception. This guide will walk you through the installation process, ensuring that your skylight is installed correctly and efficiently.

This Replacement Skylights guide will lead you through each step of the installation process, from building the curb to installing the flashing and the skylight itself. Whether you’re looking to add a light source to a dark room, interested in the benefits of solar options, or simply want to enhance your home with a Velux product, this guide will ensure that your installation is done right the first time. If you are replacing an existing skylight, remove the existing skylight and begin with the underlayment process.

The Importance of Proper Installation

Proper installation of your Velux skylight is crucial. It ensures that the product functions as intended, maintaining its durability and effectiveness over time. Correct installation is also vital for the validity of your warranty. Following the installation instructions closely will help prevent issues such as leaks and ensure that your skylight remains a beautiful and functional addition to your home for years to come.

Step 1: Preparation and Planning for Skylight Installation

Proper preparation is key to a successful installation of your curb-mounted Velux FCM skylight. This section outlines the tools, materials, and planning steps necessary to ensure your installation process is smooth and efficient.

Tools and Materials Needed

To install a Velux FCM skylight, you will need specific tools and materials. Make sure you have the following:

• Measuring tape
• Carpenter’s level
• Circular saw (for any cutting or adjustment)
• Drill with bits
• Hammer
• Utility knife
• Caulking gun
• Roofing nails
• Flashing kit (specific to your Velux skylight model)

Remember, having the right tools at hand will save time and help avoid any unnecessary interruptions during the installation process.

Installation Checklist and Requirements

Before starting the installation, it’s crucial to go through the checklist provided in the Velux installation instructions. This checklist includes:

• Verifying skylight sizes
• Checking the condition of the roof where the skylight will be installed
• Ensuring all necessary parts and tools are available

Additionally, review the local building codes and obtain any necessary permits. This step is essential to ensure that your installation complies with local regulations and safety standards.

Measuring and Preparing the Roof Site

Measure the area on your roof where the skylight will be installed. It’s important to ensure that the location you choose allows for easy and safe installation and optimal light entry.

• Use a measuring tape to find the center point for your skylight on the roof.
• Mark the outline of the curb on the roof to ensure correct placement.
• Consider factors like sun exposure and roof structure while choosing the location.

With the right tools, a thorough understanding of the installation process, and careful planning, you are now ready to begin the actual installation of your Velux FCM skylight. The next sections will guide you through building the curb, installing underlayment, and finally mounting your skylight.

Step 2: Building the Curb for Velux FCM Skylight

Constructing a sturdy and well-measured curb is a critical step in the installation of your Velux FCM skylight. This section provides a detailed guide on building the curb to the correct dimensions and standards.

Understanding Curb Requirements

The curb is the raised frame that your Velux skylight will sit on. For the FCM model, Velux specifies exact dimensions and requirements for the curb in their installation instructions. It’s important to follow these specifications to ensure a proper fit and to maintain the warranty. Specific information about your model will be found in the included instructions.

Steps to Build the Curb

1. Measure and Cut Lumber: Based on the dimensions provided in the Velux instructions, measure and cut the lumber to create the four sides of the curb. Ensure that the height and width of the curb meet Velux’s requirements.
2. Assemble the Curb Frame: Using nails or screws, assemble the cut lumber into a rectangular frame. Ensure that the frame is square by measuring diagonally across the corners; these measurements should be equal.
3. Check for Level and Square: Place the curb frame on the marked area on your roof. Use a carpenter’s level to check that the curb is level across its length and width. Adjust as necessary.
4. Secure the Curb to the Roof: Once the curb is level and square, secure it to the roof using roofing nails or screws. Ensure that it is firmly attached and there’s no movement.
5. Weatherproofing the Curb: Apply a suitable sealant around the base of the curb to prevent water leakage. Make sure that the sealant is compatible with both your roofing material and the curb material.
6. Preparing for Flashing Installation: Before installing the skylight, ensure that the curb is ready for flashing. This may involve adding roofing felt or other materials as recommended in the Velux installation instructions.

Tips for a Perfect Curb

• Accuracy is Key: Take your time to measure and cut accurately. A perfectly sized curb is essential for a leak-free installation.
• Use Quality Materials: Ensure that the lumber and other materials used for the curb are of good quality and suitable for outdoor use.
• Safety First: Always prioritize safety when working on the roof. Use safety harnesses and ensure the roof is dry and stable.

Conclusion of Curb Building

With the curb now built to Velux’s specifications, you’re ready to move on to the next phase of the installation process. A well-constructed curb is the foundation for your Velux FCM skylight and will contribute significantly to its performance and longevity.

Step 3: Installing Underlayment for Velux FCM Skylight

Proper installation of underlayment is a crucial step in ensuring the waterproofing and durability of your Velux fixed skylight. This section provides detailed instructions on how to correctly wrap the curb with underlayment.

Understanding the Role of Underlayment

Underlayment provides an extra layer of protection against water leakage and weather damage. It’s essential to install it correctly around the curb to ensure a tight seal and integrate seamlessly with the roofing material.

Step-by-Step Guide to Installing Underlayment

1. Prepare the Area: Clear the area around the curb of any debris or sharp objects that might damage the underlayment.
2. Measure and Cut Underlayment: Measure the required length of underlayment to cover the curb and the surrounding roof area. Cut the underlayment to size, allowing for sufficient overlap with the existing roof material.
3. Positioning the Underlayment: Start by laying the underlayment at the bottom of the curb, working your way up to the sides and top. This overlapping method ensures that water flows over the underlayment, reducing the risk of leaks.
4. Securing the Underlayment: Secure the underlayment to the curb and roof using roofing nails or staples. Ensure it’s smooth and wrinkle-free.
5. Sealing Edges and Joints: Apply roofing sealant along the edges where the underlayment meets the curb and at any overlaps. This further ensures a watertight seal.
6. Inspecting Your Work: Once the underlayment is installed, take a moment to inspect your work. Make sure there are no loose areas or exposed gaps where water could penetrate.

Tips for Effective Underlayment Installation

• Quality Materials: Use high-quality underlayment material that is suitable for your specific roofing type.
• Overlap Wisely: Ensure sufficient overlap between the underlayment strips and with the existing roofing material for a watertight seal.
• Take Your Time: Don’t rush the process. Careful and methodical installation of underlayment is key to preventing future leaks.

With the underlayment now securely in place, your Velux skylight installation is better protected against the elements. This step is crucial for ensuring the longevity and effectiveness of your skylight. Next, we will move on to mounting the skylight onto the curb.

Step 4: Mounting the Skylight on the Curb

With the curb built and the underlayment in place, the next step in the installation of your Velux FCM skylight is mounting the skylight onto the curb. This section will guide you through the process, ensuring your skylight is properly aligned and secured.

Preparing the Skylight for Installation

Before placing the skylight on the curb:

1. Unpack the Skylight: Carefully remove the Velux FCM skylight from its packaging. Inspect it for any damage that might have occurred during transport.
2. Read the Installation Instructions: Review the specific installation instructions provided by Velux for the FCM model. These instructions are also available in video format on the Velux website for a more visual guide.

Steps to Mount the Skylight

1. Position the Skylight: Gently place the skylight on the curb. Ensure that it is centered and aligned correctly.
2. Check for Level: Use a carpenter’s level to make sure the skylight is level. An uneven skylight can lead to problems with opening, closing, and sealing.
3. Securing the Skylight: Once the skylight is positioned and level, secure it to the curb using the appropriate fasteners as indicated in the installation instructions. This typically involves drilling through the skylight’s flange into the curb and using screws or nails.
4. Applying Sealant: Apply a bead of roofing sealant around the perimeter of the skylight where it sits on the curb. This helps to create an additional barrier against water infiltration.

Tips for a Successful Skylight Mounting

• Handle with Care: Skylights are made of glass and can be heavy. Handle with care and consider having an assistant to help with lifting and positioning.
• Don’t Over Tighten: When securing the skylight, be careful not to over-tighten the fasteners, as this can crack the frame or the glass.
• Check Alignment: Regularly check the alignment of the skylight as you secure it to ensure it remains level and properly positioned.

Mounting the skylight is a pivotal step in the installation process. With the Velux FCM skylight now securely in place on the curb, you are one step closer to enjoying the natural light and aesthetic appeal it brings to your home. The next section will cover the installation of flashing and final touches to complete the installation process.

Step 5: Installing Flashing and Final Touches

After mounting your Velux FCM skylight, the next crucial step is installing the flashing. Proper flashing installation is key to ensuring a weather-tight seal and preventing leaks. This section will guide you through the flashing installation and the final touches to complete your skylight installation.

Understanding Flashing Installation

Flashing is a material that helps direct water away from critical areas of the skylight and roof, preventing water infiltration. Velux provides specific flashing kits designed to work seamlessly with their skylights, including the FCM model.

Step-by-Step Guide to Installing Flashing

1. Identify the Correct Flashing Kit: Make sure you have the correct flashing kit for your Velux FCM skylight and roof type. Different roofing materials may require different flashing systems.
2. Prepare the Roof Area: Clear any debris around the skylight and curb area. This ensures the flashing adheres properly and functions effectively.
3. Install the Bottom Piece of Flashing: Start with the bottom piece of flashing. This usually involves fitting it around the bottom of the skylight and securing it to the roof.
4. Install Side Flashing Pieces: Next, install the side pieces of flashing, ensuring they overlap the bottom piece. Secure them in place according to the Velux instructions.
5. Install the Top Flashing Piece: The top piece of flashing is usually the last to be installed. It should overlap the side pieces. Make sure it’s securely attached and properly sealed.
6. Seal and Check for Gaps: Once all pieces are installed, check for any gaps or areas that might allow water to penetrate. Use roofing sealant to seal any such areas.

Final Touches

1. Clean the Skylight: After installation, clean the glass and frame of the skylight to remove any fingerprints, dust, or debris.
2. Inspect Your Work: Do a final inspection of the skylight, flashing, and surrounding roof area. Make sure everything is secure, properly sealed, and looks aesthetically pleasing.

Tips for Effective Flashing Installation

• Follow Manufacturer Instructions: Adhere closely to the instructions provided by Velux for flashing installation.
• Ensure Proper Overlap: Proper overlapping of flashing pieces is crucial for preventing water infiltration.
• Be Thorough: Take your time to ensure every part of the flashing is correctly installed and sealed.

With the flashing now properly installed, your Velux FCM skylight installation is almost complete. The proper installation of flashing is crucial for the long-term performance and protection of your skylight. The next and final section will cover basic maintenance tips and warranty information.

Maintenance and Care for Your Velux FCM Skylight

After successfully installing your Velux FCM skylight, understanding basic maintenance and care is essential to ensure its longevity and performance. This final section provides tips on maintaining your skylight and information about the warranty.

Basic Maintenance Tips

1. Regular Cleaning: Regularly clean the glass of your skylight to maintain clarity and light transmission. Use a mild soap solution and a soft, lint-free cloth or sponge. Avoid abrasive cleaners that can scratch the glass.
2. Inspect Seals and Flashing: Periodically inspect the seals and flashing around the skylight for any signs of wear or damage. Promptly address any issues to prevent leaks.
3. Check for Debris: Keep the area around the skylight free from debris, leaves, and snow. Accumulation can obstruct light and potentially cause damage.
4. Operational Check: If your skylight has opening features, regularly test these mechanisms to ensure they are functioning smoothly.

Warranty and Support

Velux provides a warranty for its skylights, which covers specific aspects of the product under normal use and service conditions. To maintain this warranty:

• Follow Installation Instructions: Ensure that the installation is carried out according to Velux’s guidelines.
• Keep Documentation: Retain your purchase documentation and any records of installation for future reference.

If you need warranty information, Velux’s customer service department is available to help. You can contact the customer service department at 800-888-3589 for support 24/7.

Conclusion of the Guide

With your Velux FCM skylight now installed and equipped with the knowledge for proper maintenance, you can enjoy the benefits of natural light and an enhanced living space in your home. Remember, regular care and attention will ensure that your skylight remains a valuable and functioning part of your home for many years.

Download The Full Velux FCM Installation Instructions Manual

Download FCM PDF Installation Manual From Velux