2017 3791RD Rear A/C condensate collecting on roof

[JamesDean334]

I was on the roof of our unit sweeping off slides before bringing them in and I noticed water (A/C condensation) standing around the perimeter of the rear A/C. There's a "valley", for lack of a better term, that's about 1/4~3/8" around the whole unit. Is this normal? This was the first time I'd gotten on the roof after the A/Cs had been on for an extended period. I'd never noticed this valley before and wouldn't have noticed it this time had it not had standing water in it. There is no leak inside the camper in this or any other area. My plan is, now that it's back in the barn, to get back up there and check for any obvious reason for the valley. If nothing seems to be wrong, should I fill the valley with leveling Dicor, apply Eternabond tape to the perimeter to cover the valley and create a slope for runoff, both, or leave well enough alone??

[Daryles]

I have the same rise around the edge of the roof.
Im guessing it could be the metal flashing that goes around the perimeter under the TPO rubber roof membrane.
Nothing to worry about, but keep an eye on staples, nails and screws backing out.

[jimcol]

When it is running does condensation run off the roof. If it does, like Daryles said, I wouldn't worry about it. Nothing on these roofs is perfectly sloped. I'd avoid Dicor for fear of building a dam that could lead to problems with water sitting on the AC seal. What little puddle up there will quickly dissipate when you move the 5'er.

[JamesDean334]

Originally Posted by Daryles

I have the same rise around the edge of the roof.
Im guessing it could be the metal flashing that goes around the perimeter under the TPO rubber roof membrane.
Nothing to worry about, but keep an eye on staples, nails and screws backing out.

Strange you mention that… I do have a slight ridge around the roof perimeter, and I’ve found (so far) what seems to be a fastener that’s not fully seated. I’m thinking about knocking it back to full down and covering that spot with eternabond.
The AC issue is a slight depression around the perimeter of the AC unit that holds a little condensation. It does shed off after that depression (moat) fills.