RV Skylights

How do I measure an RV skylight for replacement?

Measure the outside dimensions of the existing dome at its widest points (length and width) and the height from the roof surface to the top of the dome. Most RV skylights run 14" x 22", 14" x 14", or 22" x 30", but variants exist. Confirm whether you need an outer dome only or a complete inner and outer assembly before ordering. If you want a heavier-duty replacement, the Icon Premium Skylights collection covers the most common sizes with UV-resistant acrylic.

Can I replace just the inner dome on my RV shower skylight?

Yes. The inner dome and outer dome are separate components on most RV shower skylights, so a cracked or yellowed inner dome can be swapped without removing the outer skylight or breaking the roof seal. Match the inner dome to the outer dome size and brand (Specialty Recreation, Icon, etc.) for a clean fit.

What sealant should I use when installing an RV skylight?

Use a self-leveling lap sealant rated for RV roofs (Dicor 501LSW for TPO/EPDM or a compatible product for fiberglass) around the flange, with butyl tape under the mounting flange itself. Avoid silicone, it does not bond reliably to RV roof membranes. If you are doing a full reseal at the same time, pair the skylight with vent work from the Ventline vent essential accessories collection.

Do RV skylights ship with mounting hardware?

Most replacement skylights ship as the dome assembly only. Screws, butyl tape, and lap sealant are typically purchased separately so you can match the fasteners to your roof type. Check the individual product description for what is included before ordering.

How long do RV skylights last before they need replacement?

Standard acrylic skylights typically last 5 to 10 years before UV exposure causes yellowing, brittleness, or cracking. Premium UV-stabilized domes extend that range. If you are seeing crazing, hairline cracks, or water staining around the interior trim ring, replace the dome before the next rain to avoid roof damage.