How to install a skylight in your RV or camper

By Cheri Sicard
Letting in more natural light can make a small camper or RV feel twice as big. That’s exactly what Nailgun Nelly achieved by installing a Specialty Recreation Replacement RV Skylight 14×14 from etrailer.com into her 1959 Kencraft camper.

If you’ve ever felt your home-on-wheels was a little dark or cramped, adding a skylight might just be the trick to open things up.

In the video at the bottom of this post, Nelly shows you how to install a skylight in your RV or camper. She breaks down every step and offers trusted tips for a leak-free, watertight install.

What comes in the skylight kit

Inside the box from etrailer.com, the kit includes everything needed to weatherproof your RV’s new window to the sky.

• Outer skylight piece (white, UV-resistant polycarbonate)
• Inner skylight trim
• Skylight sealant (for UV polycarbonate – never use regular lap sealant)

One tube of sealant covers a 14×14 skylight. Larger openings may need more.

Tools and materials

Have these items ready before you start:

• Drill
• Sealant gun
• 1-inch wood screws
• Measuring tape
• Utility knife or scissors
• Cleaning supplies (rags, spray cleaner, putty knife if needed)

Watch the video to see how to do all of these steps, but this will give you an idea of what is involved:

Skip the struggle—removing an old vent is often the toughest part. In Nailgun Nelly’s case, the opening was left from an old fridge vent, so it was more about cleaning than demolition. Always start with a well-scrubbed and fully dried hole. Check sizing against your skylight before climbing up with supplies.

The skylight butyl sealant roll feels a bit like taffy and stretches as you work. Rip or cut pieces for each edge and lay them out before heading up the ladder. This ensures less balancing and fewer mistakes. Leave the sealant’s backing on until it’s time to apply.

Set the sealant on top of the opening, matching the pre-measured strips to the screw holes. Gently lower the skylight into place, making sure it’s centered and sits flush on the roof. A helper inside can double-check the position for you. Only move on once the area is clean and everything lines up.

Fastening the skylight with screws

Begin with one corner to hold things steady, then move diagonally or work around the edges.

• Pre-drill all holes before screwing in.
• Drive screws in just enough to slightly flex the plastic—not too tight.
• Use 1-inch wood screws for secure but gentle attachment.

Be patient and don’t rush this step. Too much force can crack the skylight.

Apply the SB140 or SR140 skylight sealant with a caulking gun. Spread a thick, even bead over every screw head and along the entire outer seam. This special sealant will bond with the UV polycarbonate; other types, like lap sealant, may cause damage. A proper seal means no leaks and less hassle if you ever replace the skylight.

Fitting the interior skylight trim

Once the exterior is sealed, the inside trim piece snaps into place. Confirm the screw holes match. Pre-drill each hole, then use 1-inch wood screws to secure the trim without cracking it. Check for even gaps on all sides and a snug fit. No sealant is needed here, so leaks will show up where you can see them.

Benefits of an RV skylight

Sunlight transforms small spaces fast. That old vent spot becomes a bright focal point, making the camper feel airy and more inviting. The new skylight not only improves looks but makes every day feel fresher.

Tips for installing an RV skylight

• Don’t overtighten screws to avoid cracking.
• Only use the included skylight sealant—never lap sealant.
• Organize and measure supplies before climbing the ladder.
• Clean every surface where sealant will touch.

A safe RV skylight install is a dry, long-lasting one.

RELATED

• Replacing your RV skylight
• Resealing an RV skylight: Sealing tips from the pros
• Are there covers to protect RV roof vents and skylights from hail?

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