Looks to me like too much weight from a person or persons crushed the roof gussets that attach to the edge. As such, you have a 1/4" dip just before the aluminum roof radius support.
Structurally, I'm guessing your roof will sink if you stand anywhere near this area?
...But, what to do about is the problem?
...If have a DEEP CRACK in the pylon then this could be the source of your leak, but when I look at your roof seam-sealant, it looks like you have not replaced it in years!
Roof maintenance is a 2 year event... even if you store your coach in a Pole Barn; and there has been much written about the best sealant to use. Google Proflex Geocel and you will find out more.
So your leak could be coming from anywhere under that old roof seam-sealant.
Below are some picture that will help you better understand the roof construction used by Winnebago... which should be similar to your roof. (I guess.)
As for what to do about your roof dip? ...Here are some suggestions:
* If you find cracks in you pylon, buy some Eternabond Tape and make sure you apply it to a very clean roof using a floor roller. (The pressure activates the bond.)
* As for that valley (where water pools now) I think I would bondo it to fill in the valley and then sand it smooth. Or I might use Flex Patch, but the problem with Flex Patch, by Flex Seal is that you can't sand it after you lay it down so it will always look like a repair in that area.
* Then I would clean your entire roof and scrap off any old and cracking Lap Sealant around your vent and skylight.
* Then I would buy 10 gallons of Tropi-cool 100% roof sealant at Home Depot and roll this stuff over your entire roof to give it that new look and to hide roof imperfections and to give your room more insulation from heat.
Alternatively, you can use a Dicor fiberglass roof sealant... you can buy at Camping World, and that will give it a more painted roof look, but it will be more expensive.
* Then you apply new lap sealant all around your vents as needed and on your front and rear roof cap seams.
And you are almost done! ...Because you still need to have your roof radius seams re-glued with Proflex Geocell.
IMO, you have 3 days of work. 4 days if you do a real good job and if you roof needs maintenance somewhere else.
*** YOUR ROOF WILL ALWAYS BE WEAK IN THIS AREA, but you can fix the cosmetics and if you don't walk on that side of the roof (in this weak area) then maybe that will be okay with you?
*** Your only other alternative, IMO, is to cut off the entire back roof area and then reinforce those roof trusses; and then reapply a pylon wood and fiberglass top... then use Eternabond over the seams... repaint, etc. ...But for what, just so you can walk on that area again? ...I wouldn't spend my money this way, but if it's insurance money that's a different subject. This is a 5-6 day repair, IMO.
TIP: If you are paying out of your own pocket, and if you don't like the $4K-$5K estimates you will get at a local body shop (+$500 to re-glue your roof radius seam; I don't blame you! ...So here's a tip: I would plan a trip to Rocky Point, Puerto Penasco, Mexico and have Carlos do the cosmetic and roof radius re-seal for ~$1,500 (IMO) ...and you bring him the roof materials (except bondo) and enjoy a 5-7 day visit on the beach in Rocky Point while your RV is getting fixed!
I wrote all about my travels to Rocky Point last summer to have Carlos perform body work and to re-glue my roof radius. I also took my tow car with me the second time I visited Carlos and he repaired and repainted a door. (See links below for more information.) Now my RV and tow car have never looked better!
Then I hired several other people to help me change the engine coolant, tune up my basement AC, shampoo my carpets and clean my daylight shade and floors.
This is why I call "The Reef" at Rocky Point a "RV DAY SPA!" And while they were working on the RV I was enjoying a great vacation and beach and restaurant and local Mexican culture. ...And you can even get a massage outside your RV, with cool ocean breezes, by the local women who also make a living supporting the RV community. (SO FORGET GOING TO FLORIDA. YOU WILL NEVER GET EVERYTHING YOU WANT IN ONE PLACE AND YOU WILL PAY BIG BUCKS!) ...And I guarantee you will like the quality of work you get in "The Reef." It's just amazing! I was so impressed, and YES... I plan to go back in March-2021, but not to get any work done, because I don't need any. I'm going back for the $25/day or $50/day "on the beach" parking and for the vacation experience.
Body Repairs In Rocky Point Part 1:
https://www.winnieowners.com/forums/...ew-358003.html
Roof Maintenance Part 2:
https://www.winnieowners.com/forums/...ce-358625.html
. (full time volunteers)
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