Last week, I replaced an RV skylight – and I’ll show you how to do it, too. Like many DIY jobs, 90% of the work is the preparation. It’s a simple job that most anyone can do, but if you want the installation to last for 10-20 years, do it right!
Here’s my in-depth, step-by-step guide to replacing your RV outer skylight dome. I’ll tell you the tools, materials, and steps you need to do the job professionally.
Tools >>

- Caulk gun
- Utility knife
- Plastic scraper (or other non-marring scraping tools)
- Drill or impact driver with driver bits (usually #2 square bit or ¼” hex nut driver)
- Medium-bristled brush or sponge
- 2” steel roller (opt)
- Vinyl/latex gloves
- Ladder (for access)
- Moving blankets (opt)
- Heat gun (opt)
Materials >>
- Replacement skylight (see notes below)
- 2-3 qty 10oz tubes of self-leveling sealant
- 1 tube of non-sag sealant (opt)
- 6-20 feet of ⅛” thick butyl tape
- #8×1” or #10×1” exterior pan head screws
- Soap and water
- Isopropyl or denatured alcohol
- Paper towels
- Microfiber towels
Step 0: Protect Your Roof!
If you have an RV membrane roof, you wouldn’t believe how frail the membrane can become after years of exposure to Mother Nature. Protect the side of your RV by laying down a yoga mat or moving blanket beneath the ladder rails, and protect the roof itself by wearing soft-soled shoes. Better yet, bring up some moving blankets or spare cardboard to step on, instead.
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