Your Ultimate Guide in Installing and Flashing a Skylight

Your Ultimate Guide in Installing and Flashing a Skylight | Waterbury’s Pro Roofing & Repairs

Benefits of Having a Skylight as a Roofing Material

March 17, 2022 7 Read

A roof skylight is a window installed in a roof, typically allowing natural light and, if open, ventilation into the building below. Skylights provide daylighting, which can reduce energy costs associated with artificial lighting. They may also reduce the need for air conditioning in summer.

There are three types of skylights: fixed, ventilated, and tubular. Fixed skylights do not open and are sealed shut with glass or plastic panes. Ventilated skylights have operable vents that allow fresh air to enter and stale air to escape. Tubular skylights are fixed skylights that use a lens to collect light from the sun and direct it down a tube lined with reflective material.

Benefits of Having a Skylight as a Roofing Material

While most roofs do not have a skylight, having one or more Velux skylights on your roof will give your home a lot of benefits.

Having Natural Light Come In

When you have a skylight installed as part of your roofing system, you will have natural light from the sun coming into your home, reducing your need for electricity during the day. This can save you a lot of money on your monthly energy bills. You will also be helping the environment by reducing your reliance on electricity.

Getting Ventilation

Another benefit of having a skylight is that it allows for ventilation or fresh air from the outside. If you live in a hot climate, skylights such as a Velux skylight can be beneficial in keeping your home cool. The fresh air coming in through a Velux skylight will help to circulate the air and keep you more comfortable.

Know What the Weather Is Like Without Going Outside

Another great benefit of having a skylight is that you can get an idea of the weather without going outside and being exposed to the elements. If it is raining or snowing, you will be able to see it from your skylight. This can save you time from going outside and checking the weather.

There are many benefits to having a roof skylight installed in your home. Some of these benefits include getting natural light into your home, getting ventilation and fresh air, and knowing what the weather is like without going outside. If you are interested in installing a roof skylight, contact a roofing company today.

Disadvantages of Having a Skylight on Your Roof

There are a few disadvantages that you should know about before getting a skylight installed in your home.

Cost of Installation

One of the most significant disadvantages of having a skylight is the cost of installation. Skylights can be expensive to install, and you will need to hire a professional roof installer to do the job. If you are a homeowner on a budget, getting a skylight installed may not be an option for you. Another reason it is costly to install skylights is to remove existing roofing materials to give way to this roofing window. The number of roofing materials to remove will depend on how large the skylight frame will be.

Leakage and Proper Water Drainage

Another disadvantage of having a skylight is that it can lead to leaks. If your skylight installation was not done correctly, it can leak when it rains or snows. Leaky skylights can damage your home and lead to mold growth. If you live in an area with a lot of rain or snow, it is essential to ensure that your skylight is installed correctly and has a tight seal to avoid leaks.


Another disadvantage of having a skylight is that it can fade over time. The sun’s UV rays can cause the colors in your skylight to fade over time, just like they would when a photo is exposed to sunlight for a long time. If you have a skylight with many intricate details or colors, this can be a problem.

While there are some disadvantages to installing a roof skylight, the benefits outweigh the costs, especially if a skylight’s installation and flashing are done correctly.

Installing and Flashing a Skylight

If you are interested in installing a skylight in your home, it is essential to know it correctly. The following is a guide on adequately installing and flashing a skylight.

Installing the Skylight Frame

The first step is to remove any existing roofing material to make way for your skylight’s frame when installing a skylight. You may remove more than one shingle or roof tile, depending on the size of the skylight frame. Next, the framing for the skylight should be installed. The structure can be made out of lumber or metal. Once the framing is in place, the skylight can be installed.

Skylight Flashing

Skylight flashing is an essential part of the installation. Flashing prevents water from entering your home through the skylight. It is vital that the skylight flashing be installed correctly to avoid water seepage or leaks. There are many different types of flashing, so it is necessary to select the right one for your skylight.

  • Step Flashing - Step flashing is the most common type of flashing used when the skylight is installed on a pitched roof. Step flashing comprises two pieces: a base flashing and a saddle flashing. The base flashing is installed first, and it sits flush against the roofing material. The saddle flashing is then installed on top of the base flashing, and it wraps around the skylight frame.
  • Drip Edge Flashing - Drip edge flashing is another flashing that can be used with skylights. This flashing helps prevent water from seeping behind the skylight frame and entering your home. It consists of a metal or vinyl strip installed along with the roofing material’s corners and under the skylight frame.
  • Top Flashing - Top flashing is a flashing that is installed on the top of the skylight frame. It helps prevent water from entering your home through the roof around the edges of the skylight.
  • Sill Flashing - Sill flashing is a flashing that is installed on the bottom edge of the skylight frame. It helps to prevent water from entering your home through the window sill.

After properly flashing your skylights, you can finish installing the window by adding shingles, tiles, or other roofing material to cover the frame. It is also best to inspect your skylights thoroughly to prevent any leaks in the future. If you follow these steps, you can ensure that your skylight is installed correctly and won’t leak.

Step Flashing Curb Mounted and Deck Mounted Skylights

There are two ways of mounting a skylight: deck mounted and curb mounted. The instructions for installation and step flashing are different for each method.

Deck Mounted

This is the most common type of installation. The skylight is mounted on the roof decking material and sealed with a neoprene gasket and flashing kit. The curb is built up around the skylight to provide support and additional weather protection. This type of installation usually requires less roofing material to be disturbed, which means there is less potential for leaks.

Curb Mounted

A curb-mounted skylight is a type of installation used when it is not possible or desirable to install the skylight on top of the roof deck. The skylight unit is placed onto a curb that has been built up around it and then sealed with a neoprene gasket and flashing kit. The flashing kit should include a waterproof membrane to prevent water infiltration.

Installing Velux Skylight Flashing Kits

Velux is a company that manufactures skylights and offers skylight flashing kits for its products. Velux skylights are popular choices for professional roofing companies since they can be adequately installed even by a family handyman. When planning to install a skylight on your roof, it is best to choose Velux skylights since they already come with flashing kits that already include materials such as underlayment and other materials. Likewise, Velux skylight flashing kits are also available in different types to fit either deck or curb mounted skylights. Another advantage of Velux skylight kits is that they come with a leak warranty. It is, therefore, best to use skylights that Velux manufactures.

Having one or more skylights on your roof will give you many benefits, especially if the skylight installation and roof flashing are correctly done. Not only will you get more access to natural light and ventilation into your home, but you will also be able to increase its resale value in case you ever want to sell it. Adequately installed skylights can also add architectural interest to your home. So if you are thinking of adding a skylight to your home, make sure that you purchase a flashing kit from Velux to ensure that the installation is done correctly.