The Importance of Skylight Flashing

Outside of a roof with Skylight and Flashing

VELUX Skylight Flashing System

VELUX Skylights are a great addition to any home. But in order for them to work properly, they must be installed with a strong flashing system.

Residential skylights are becoming increasingly popular among homeowners who want to cut down on electricity costs because they are eco-friendly, cost effective and energy-efficient. However, in order to reap the benefits of having a skylight, it needs to be installed properly – skylight flashing is an important component of a proper installation. 

Even the U.S. Department of Energy acknowledges the importance of skylight flashing. An article published on energy.gov states, “Avoid water leaks by…installing a curb (a raised, watertight lip that helps to deflect water away from the skylight) and flashing…”

What is Skylight Flashing? 

Essentially, skylight flashing keeps the skylight leak-free. It is installed around the perimeter of the skylight to prevent water and air from leaking in or out. Without it, there’s a good chance that water can seep through the sides of the skylight and that air will flow outwards. 

Flashing kits usually come in three or four parts. Each piece fits snugly around the skylight’s frame. They’re generally very easy to install and aren’t expensive, either. Depending on the skylight style, a VELUX flashing system can be purchased for less than $100.

Flashing Kits Vary by Skylight Type

The size and type of skylight you are installing will determine the flashing needed. VELUX makes several types of flashing systems, each one designed for a different type of skylight.  

Curb-mounted and deck mounted skylights, for example, require a rectangular flashing kit that is installed around the perimeter of the skylight. This style is known as “step flashing” because it is installed like stairs. Step flashing is built to fit tightly against the shingles on a roof.   

There’s also a step flashing kit designed specifically for VELUX Roof Windows.

For homeowners whove purchased a VELUX Sun Tunnel, there is a special, easy-to-install flashing system. The kit is made to fit around the Sun Tunnels cylindrical form.

Self flashed (also called pan flashed) skylights do not require a skylight flashing system.

VELUX No Leak Warranty 

One reason why homeowners love VELUX is that their products come with a 10-year, No Leak Warranty. The company believes in their skylights so much that they offer a full refund to anyone whose skylight starts leaking within the first decade after purchase. However, in order to be eligible for the No Leak Warranty, the homeowner must purchase and install a skylight flashing kit at the same time as their skylight.  

While the addition of flashing might bring up the initial cost, it helps to ensure that the homeowner’s investment is a good one.  

Click here to shop for skylight flashing kits!  
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