2003 25BH wet underfloor

[pchrisry]

Rear end leaking behind bumper. It's all wet under the underside of the black mat that covers the bottom of the camper. Any suggestions on where to start looking for an issue/leak?

[crunchman12001]

Welcome to the forum.
On a 15 year old unit, it could be from 20 + different areas.
Is this a new to you trailer?
Aluminum or fiberglass exterior?
Did you remove the underbelly covering?
Is there a kitchen or bathroom in the rear above the leak?
Post some pictures of the back of the trailer.

[pchrisry]

Had it 5 years.

Fiberglass exterior

I did not remove underbelly material.

Kitchen and bathroom not on this end, but water tank is. Does not appear tank is leaking.

[KMP44]

I would start by looking at the clearance lights and the seam where the roof meets the back wall. If the rook caulking and the caulk around those lights haven't been inspected closely and re-sealed in a while they could be the source of your leak.

[Millhouse]

Originally Posted by pchrisry

Attachment 142900

Attachment 142901

Attachment 142902

Had it 5 years.

Fiberglass exterior

I did not remove underbelly material.

Kitchen and bathroom not on this end, but water tank is. Does not appear tank is leaking.

Is the back fibreglass wall loose, bubbled out kind of? That means water got in and ran down to the bottom. As mentioned could be the roof seam, rear window, rear latter.
Or I can see the bottom molding sealant is cracked and old which would allow water in also. Looks like Alot of dry rot in there.
First u must isolate the leak then begin the fix. To find it u might have to start removing molding etc to get in there. Start at the top roof down.
Since the bottom sealant is old, how about the lights and roof seam?

[crunchman12001]

As posted above, start at the top and work your way down with sealant. Looks like you have a major repair ahead of you with the rotting plywood.
Unless you are very handy, might be time for a trade in. ( 9 out of 10 on the handy meter for floor repair)
Got to ask, is that a bike rack attached to your rear bumper?

[pchrisry]

Originally Posted by Millhouse

Is the back fibreglass wall loose, bubbled out kind of? That means water got in and ran down to the bottom. As mentioned could be the roof seam, rear window, rear latter.
Or I can see the bottom molding sealant is cracked and old which would allow water in also. Looks like Alot of dry rot in there.
First u must isolate the leak then begin the fix. To find it u might have to start removing molding etc to get in there. Start at the top roof down.
Since the bottom sealant is old, how about the lights and roof seam?

It's old on the top, but looks like its still sealed up. Appears to be a later seal job.

Sealant around lights looks ok.

[pchrisry]

Originally Posted by crunchman12001

As posted above, start at the top and work your way down with sealant. Looks like you have a major repair ahead of you with the rotting plywood.
Unless you are very handy, might be time for a trade in. ( 9 out of 10 on the handy meter for floor repair)
Got to ask, is that a bike rack attached to your rear bumper?

Yes it's a bike rack.