How to Install Skylights on Low Slope Roof Without Leaks?

Installing skylights on a low-slope roof is a fantastic way to make your home brighter, improve ventilation, and make the room feel spacious. Installing skylights might seem daunting, but with the right material, proper planning, and expert help, they may last for years without facing major issues like leaks. Skylights are especially useful in regions with frequent clouds, where natural light is limited. Skylights reduce your dependence on artificial lighting. A thoughtfully placed skylight can do a lot; it brightens dim corners, makes the space feel more open, and can even bring in fresh air.

Things You’ll Need for Skylight Installation

Before starting your skylight installation, make sure you have all the necessary tools and materials assembled. Having everything in one place not only saves your time but also ensures a smooth installation with minimal chances of a faulty installation.

1. Safety Equipment: Gloves, goggles, and a hard hat to protect yourself.

2. Measuring tape and level: To ensure accurate measurements and level surfaces are key to accurate installation.

3. Cutting tools: A circular or reciprocating saw is required to outline your roof opening.

4. Flashing: Made for skylights to properly redirect precipitation and help prevent leaks.

5. Skylight units: Choose between fixed, vented, or tubular based on your preference.

6. Fasteners: Roofing nails and screws to secure your skylight and flashing.

7. Roofing materials: Asphalt and roofing felt are used to add an additional protective layer against the elements.

8. Caulk and sealant: Use a weather-resistant product to seal edges and joints to block leaks.

9. Metal snips: For trimming, flashing, and making adjustments.

10. Ladder or scaffolding: To safely access your roof.

11. Hammer and nail gun: For fastening your structural components.

12. Pry bar: To remove any existing material, if needed.

13. Roofing cement: To seal gaps and help create a watertight seal.

Basic Steps for Skylight Installation

Step 1: Find the Right Location

Choose a spot that has ample natural light, ventilation, and does not affect your home’s structure. The right location of the skylight will help you enjoy the exterior view from the interior. Also, ensure that the chosen area allows for proper water drainage, especially on low-slope roofs.

Step 2: Measure and Mark

Measure the skylight frame. Lightly mark (with pencil, white chalk, or white paint) its outer edges on both the exterior roof and the interior roof of your home. This helps to avoid rafters and other structural elements before cutting. It’s important to be accurate with your layout to prevent future issues.

Step 3: Prep the Roof and Cut the Opening

Clear the area, remove shingles or tiles, and bring your tools up to the roof for easy access. Use a circular saw (or an appropriate tool for metal roofs) to cut openings along the previously marked lines. Make pilot holes at each corner before sawing for smoother cuts and less damage. Once cut, remove the portion carefully and check for any debris or loose material around the cut opening.

Step 4: Install the Curb and Frame

If you plan to install a curb-mounted skylight, build the curb first. Then attach and seal the skylight frame. The most important part of the flashing is to caulk it correctly to protect it from leaks during or after the installation. Always start flashing at the bottom, install sill flashing first, then side flashing, and lastly head flashing. Another good tip is to press firmly on each piece to make it watertight.

Step 5: Fit the Skylight Window

Place the window pane at the right location and secure it. Use caution while applying pressure to the pane to avoid cracks and scratches. Tighten the fitting according to the standards indicated by the manufacturer and seal all edges. After installing, check for visible gaps, and conduct a light water test to evaluate if the seal is perfect.

Avoid These Common Skylight Installation Mistakes

Skylights are a great way to obtain natural light and reduce electricity costs, but the process of installing them is not always foolproof. Even a simple mistake during the installation process can lead to leaks, inadequate performance, or repair costs later on. Here are some common mistakes to watch out for before getting started:

1. Poor Placement of Skylight

Many homeowners focus only on the interior, but it’s crucial to check above the ceiling for pipes, wiring, and sunlight access before installing a skylight.

2. Installing a Skylight on a Damaged Roof

You don’t need a brand-new roof to install a skylight because the old roof is also suitable, but it must be in good condition. If your roof has leaks or damage, fix it first and then make a hole in it because any cut into a weak roof can lead to leaks and serious water damage.

3. Considering Skylight Installation as a DIY Project

Skylight installation can be complicated and time-consuming, and often, it is the smallest oversights that lead to big problems. If you’re not experienced, it’s best to hire a qualified professional to do the task.

4. Ignoring Tubular Options

Tubular skylights can be a great option, especially for tight spaces. They’re easier to install, cost less, and have a lower risk of leaks compared to standard skylights.

5. Choosing the Cheapest Skylight Option

Going for the cheapest skylight option might seem the right choice, but generally, low-cost materials don’t perform well for a long period. Investing in better quality can save more through durability and energy efficiency.