I have a 1990 Fun Lite and the roof is sagging in the area of the air conditioner. I just bought it and the people I bought it from said A/C was recently replaced. So I suspect a leak, but there is no discoloring around the area that's sagging.

I'm going to start by removing the interior roof panels to see what's happening

Anyone else have this problem and could give me some tips ? I have no idea as to the construction of the roof or ceiling, so any help is appreciated.

Inside roof you have 1" square tubing around the inside perimeter of the roof vent/AC unit. Watch out for the fiberglass insulation between the interior panels and actual roof. The roof is aluminum skin. Check for galvanic "rot" due to the reaction of dissimilar metals in roof. look for areas of white crust, rust on steel frame members, or wet insulation these will give an indication of where your water infiltration is. I used Tropicool on my roof after fixing my water infiltration. Sealed anything that passed through roof with EternaBond (plumbing vents, roof vents, etc.) before I rolled on Tropi-Cool. Have not had a drop of water come inside since.

1" square tubing is severely rotted in the center of the roof.....going to clean the tubes and weld new ones along side old ones where the old ones are good. putting in new ceiling
also looking for gaskets for A/C
any comments

My roof was also sagging on my 97 towlite after I determined the weld joints were not cracked I slipped in 3/8 marine grade plywood between the ceiling framing and the metal roof after removing the a/c this brought back the crown to the roof and reinstalled the a/c

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Les & Patricia
2006 22ft towlite (replaces 97 21TL)
2006 Toyota tacoma pre-runner 4.0 L V-6 quad cab
w/ 98 chevy Powervision towing mirrors
2017 Chevy Silverado 1500 5.3 v8 (replaces Toyota)
2 Hobie mirage pedal drive kayaks