What Sealant Should I Use When Replacing an RV Roof Vent?

Question

Question:

Hi etrailer, I'm replacing the original roof vent on my fifth wheel with the Ventline Ventadome Roof Vent. Is Dicor the right sealant to use after I get everything bolted down?

asked by: Mike D

0

Expert Reply:

Hey Mike! Yes, Dicor Self-Leveling Lap Sealant # DC94SR is exactly what I recommend for roof vent installation. Whenever you're working on a roof, self-leveling sealant is almost always what you want to use. Install the # V2092SP-28 over butyl tape like # DC38SR first, then apply the Dicor over the mounting screws and around the flange to create a weatherproof secondary seal.

Which roof vent are you replacing?

expert reply by: Robin H

0

Dicor Self-Leveling Lap Sealant
(click to enlarge)

Trevor W.

8/19/2026

Do I need to remove all of the old lap sealant before installing the new vent and putting the DC94SR down? Mine has quite a bit built up around the old flange.

Robin H.

8/20/2026

@TrevorW I would remove the old sealant and clean up the mounting area before installing the new vent. You want the new butyl tape sealing against a clean roof surface, then you can apply the # DC94SR over the new flange and mounting screws. It's a little extra work up front, but this is definitely a spot where I'd take my time and do it right.

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