If you’re reading this, you probably have a Velux skylight or window that’s leaking water into your building. You’re not alone; a leaking Velux window is a common issue. However, as annoying and inconvenient as a leak can be, there are solutions.
In this guide, we’ll explain how to quickly diagnose and fix a Velux window leaking problem. We’ll also discuss when it’s time to call a professional for more serious leaks or window replacements. But first, let’s understand why your window might be leaking in the first place.
Velux roof windows can leak for various reasons. Knowing why your office units are leaking will go a long way toward arresting the situation and preventing future occurrences.
Here are the potential causes:
The flashing kits and screws used to install Velux windows can become damaged over time, leading to Velux windows leaking in corners. As the Velux window frame expands and contracts with temperature changes, the flashing and screws also move, eventually causing cracks.
Check around the edges of the roof window for any visible damage or holes in the outer flashing and feel around for an air leak. You may need to do a Velux window seal replacement or change damaged parts to fix a Velux leaking between the window and frame.
You may face Velux windows leaking problems if your window units aren’t installed properly according to the manufacturer’s guidelines. For example, windows that aren’t level or square in the opening or where the flashing tape isn’t applied correctly around the edges will allow water to seep in. Such water ingress will damage the wood frame, eventually dripping into your building.
Unfortunately, the only way to remedy a poor installation is to remove the window and reinstall it properly. To avoid causing further damage, this is best left to a professional glazing company.
Over time, leaves, dirt, and other debris can collect on Velux windows and damage the seals, especially in hard-to-reach areas like the hinges or where the window meets the roof.
Give your Velux windows a regular inspection, cleaning the skylight windows from the inside and outside to remove any built-up debris. Notice when the amount of natural light entering has diminished, as this can indicate a build-up of debris. Pay extra attention to seals, edges, and hinges where small cracks or holes may have formed, allowing water to seep in.
Resealing or replacing damaged parts should fix most minor leaks caused by debris build-up.
Now that you understand the likely causes, let’s now see how you can fix a Velux window leaking in heavy rain.
A leak is one of the many common problems with Velux windows and can often be fixed via a DIY approach. Below is a general guide to fixing Velux window leaking problems. We also offer advice on when to contact a professional.
The sealant around the skylight frame is the most common source of Velux window problems. To fix a Velux window seal leaking issue, carefully clean away any old, cracked sealant from around the inside edge of the frame. Apply a bead of quality Velux window sealant, silicone caulk, or roof cement and spread it evenly around the frame with a putty knife or caulk tool. Press firmly so it adheres well.
The flashing around the base of the skylight redirects rain and snow away from the opening. If it’s dented, rusted, or pulled away from the roof, it won’t do its job properly. To fix a leaking roof unit, you may need to apply roof cement or Velux window seal to any damaged areas of flashing to patch holes or re-secure loose edges.
For larger issues, consider doing a flashing replacement. However, be very careful when making repairs on sloped or pitched roofs.
If you notice the gap between the glass panes and the skylight frame seems larger than usual, the panes themselves may have shifted or come loose. Tightening the hardware that secures the glass panes can often fix the Velux window leaking bottom corners.
Carefully tighten any screws or bolts around the edge of the frame to snug the glass panes back into place. You should also add sealant around the edges for an extra barrier against leaks.
When you experience persistent Velux skylight leaking or major damage, such as incorrect installation or broken panes, it’s best to contact a professional to assess whether repair or full replacement is needed. They have the proper safety equipment, training, and experience to fully repair or replace your Velux skylight. A new, properly installed skylight will provide energy efficiency, security, and many years of a weather-tight seal.
GLRE is a commercial glazing repair and replacement company with over 25 years of experience. Get in touch with our team today to book a leak inspection or general evaluation of your glazing units.
To stop a VELUX window from leaking, resealing the window is often necessary. Additionally, inspect the roof felt to ensure a weather-tight seal. Leaks may stem from a faulty flashing kit, pierced felt due to screw holes, or other damages. Addressing these issues is crucial for maintaining a dry interior.
Yes, a VELUX window can be resealed. If moisture is seeping in due to a failing sealant rather than a leak, resealing is a cost-effective means of restoring the window’s integrity and preventing further moisture intrusion. Moreover, the process is relatively quick, typically requiring only about an hour to complete.
Thanks to technological advancements, the life expectancy of a VELUX window ranges between 20 and 30 years. This significantly outlasts the average skylight’s lifespan of 8 to 15 years, marking VELUX windows as a durable, long-term investment in natural lighting solutions.
A skylight leaking in heavy rain often indicates an installation issue. However, it could also stem from a faulty component or a worn seal, indicating the need for repair or replacement. Ensuring proper installation is key to preventing leaks, especially during intense weather conditions.
Don’t let a little water damage turn into a huge headache. Follow the tips we’ve shared with you to catch it early and make those repairs ASAP. It may seem annoying to have to fix your skylights, but it’ll be way more annoying if you let it go too long. Trust us; you don’t want mould taking over or wood rot setting in. Just follow our guide, get the right materials, and handle that leak pronto. Remember to contact a professional to inspect a more severe Velux window leaking—we are always available at GLRE for commercial glazing repair and replacent.
