caulking an RV roof

[Rob]

I am in the process of de-winterizing an RV.  Did a quick roof inspection and I found a couple spots where the caulk needs to be touched up due to cracks, etc.

Question is:  Do you remove the old Caulk and replace it?  Or just clean the spot that needs patching and add a dollop of Caulk?

To describe the areas, there are no major cracks.  Nothing more than 1/2 to 3/4 of an inch.  The old caulk is still malleable and is adheared well.  The worst spot is one of the ceiling vents that has a corner exposed (about 1/3 of an inch on each side of the corner.

My inclination is to take some of the self-leveling stuff I got (Dicor 501LSW-1 Self-Leveling Lap Sealant) and just fill the cracks with a little excess.

[Special T]

According to several RV manufactures your supposed to completely strip and reapply every 6-12 months. My brother did RV repair for a while. Leaking rout an mold destroy campers trailers and motor homes very quickly. I'd probably strip anywhere it's tapped out clean and reapply myself.

Is it stored undercover during the rain snow season or otherwise not in use? If yes then small bandaids are probably ok for the fair weather trip.  For West side hunting trips in the rain? I caulked every other year and then settled on a roofing product to paint the top of mine.
I've used this stuff to seal up shipping containers, RV roofs, and other similar projects. The fiber makes it last longer and the aluminum reflects heat.

[KFhunter]

It depends on what roof you have, if rubber roof, you use dicor self leveling and generally just apply to cracks, works it’s way down

Clean with denatured alcohol and a rag, I use my archery alcohol I use for cleaning arrows before I fletch, get a quart size can at N40

Silicone does not belong on an RV roof, only use on the sides

[Rob]

Cool - I think I will just patch the spots for right now while I consider a longer term removal and replacement.

The roof is some kind of rubberized compound (Looks like TPO).  RV is stored under a shelter when not in use.

T:  I will make note of that that Karnak roof coating.

[Special T]

Cool - I think I will just patch the spots for right now while I consider a longer term removal and replacement.

The roof is some kind of rubberized compound (Looks like TPO).  RV is stored under a shelter when not in use.

T:  I will make note of that that Karnak roof coating.

I don't think this will work on those rubberized membranes, or at least I've never tried, just used it aluminum roofs.

[Rob]

I was just wondering about that!

Thanks

[wadu1]

I've used Karnak on aluminum roofs with great success. My last RV is sitting in Quincey for over 10 years without a leak.

[Stein]

According to several RV manufactures your supposed to completely strip and reapply every 6-12 months. My brother did RV repair for a while. Leaking rout an mold destroy campers trailers and motor homes very quickly. I'd probably strip anywhere it's tapped out clean and reapply myself.

Is it stored undercover during the rain snow season or otherwise not in use? If yes then small bandaids are probably ok for the fair weather trip.  For West side hunting trips in the rain? I caulked every other year and then settled on a roofing product to paint the top of mine.
I've used this stuff to seal up shipping containers, RV roofs, and other similar projects. The fiber makes it last longer and the aluminum reflects heat.

I put that on my old man's rental apartment with my brother once.  It was August and we both got fried, even under our chins from the reflection off it (flat roof).  It's a hot mess to put on and clean up but that was over 20 years ago and still no leaks.  We threw away our clothes after including our shoes.