How bad is this? (urgent) Roof

I would wash the roof like others have mentioned. Use a soft bristle brush, a car wash brush for example, and some non abrasive cleaner(roof cleaner). Do not use a pressure washer, nothing good can come of pressure washing a RV. Regular garden hose, water, soap, bucket and brush. There are coatings that you can buy to re seal the roof. I haven't used them myself. I would avoid using eternabond on the entire roof. I am up on my roof 2x a season, 1x at the beginning to check for any cracks in the caulking and once at the end to re-caulk and inspect. I have owned 4 trailers and have done this with every one. I am a big fan of dicor self levelling lap sealant. It's not extremely expensive and does the trick. If fact any monkey with a caulking gun can apply it. I have read that RV roofs are good for 12 years, however I have had an older unit that was meticulously maintained by the first owner and my roof was awesome never had an issue with it. Best of luck with everything.

You don't want to eternabond the whole roof. Way to expensive.

Those pics are proof that some people should stay away from eternabond. It was either a bad batch, or terrible surface prep. Looking at how sloppy it was applied, I lean toward terrible surface prep.

Pic two, is that a hole in the rubber, or is it a drip of dicor or? A short piece of eternabond over that and it will be fine.

Remove as much of the loose EB and reseal with dicor or more EB.

Or, if that is white peeling off the black rubber of the roof, you may as well plan on having a new roof installed.

Thanks for all the help everyone. I am going up there this weekend with some Lap sealant and some more Eternabond


what do you guys mean by "clean" the roof ? I was going to spray the spray that comes with the Eternabond tape, wipe the area down good with a towel, then lay down eternabond ...

should I actually "wash" the roof or does that do more harm then good ?


Also I don't think that's mold that's the roof wearing away ? then how much life does this roof have left in it ? 2 years ? 5 years ?

what if I Eternabonded the entire roof ? does that make sense ?

Clean, rinse, repeat then seal IMO.

What you don't know can hurt you big time. Fortunately our trailer has an all aluminum frame and EPS so all I had to replace was the inside ceiling. From the manufacturer a number of joints were not sealed.
One possibility is to buy a moisture meter, if you have more than 20% moisture you have a breading ground for mold.

If you have no leaks, inside shows on signs of leaks on the ceiling or the walls, if the roof feels solid, no mushy spots, then a really good wash and a new inspection after it's cleaned up. Then just recaulk. Any place you can remove that tape, I would and caulk it new and get away from the tape.

If you have signs of water in the ceiling inside, and if the roof is mushy, then you've got water damage, and a trip to a repair shop might be in order to determine the damage.

Even with the first pic, I see edges of the EB not holding. People here always say use EB for every ailment. I disagree. Some areas like around the vents should just be self leveling joint compound. IMHO

I have a reoccurring area that requires some of the self leveling stuff every couple of years.

Are you sure its mold and not the white wear layer wearing off the rubber? Where is your camper stored that mold would grow? Its unusual to find mold growing on something exposed to the sun. While I rarely advocate for washing a camper roof, it might be a good time to thoroughly wash and inspect your entire roof.

If that is a chunk of roofing material missing, that is not good. If it is exposed to water, you should likely peel back the rubber and inspect the wood roofing below to make sure it isn't rotting. If it is, repair the roof decking before doing anything else. Liquid Roof is a pretty easy (but somewhat messy) way to patch EPDM roofing material. It is a 2 part liquid that you mix and apply to EPDM roofing. The Liquid Roof is literally painted on with a brush or roller. It adheres to the existing EPDM and dries to a seamless EPDM rubber. Its easy to DIY and does not create any seams. You can even recoat your entire roof for a couple hundred dollars.

If appears as though the Eternabond did not stick properly. I would cut off the loose portions, thoroughly clean the area and attempt to attach new Eternabond again. Remember that Eternabond requires pressure (like a roller) to ensure a good bond to the roof.

How much damage could have been done ? Not much at all? Just caulk it with decor lap sealant and move on ? No big deal ?

The mold will wash off,caulk rest as needed.