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Old 08-08-2023, 10:23 AM   #1
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Aluminum siding bubbles out when towing

My kids have a Coleman travel trailer that is about four years old. When they tow it and get going around 60 miles per hour, the aluminum siding, which runs front to back, seems to bellow out or fill with air on the left side of the trailer maybe three feet back from the front. The siding doesn’t look like it is attached from the outside (there are no visible screws holding it on). Does anyone have insight into why this happens and what we should do or worry about?

Pete
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Old 08-08-2023, 11:23 AM   #2
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Well, my vote always is if it doesn't look right, and you're going to go on a trip eventually... and possibly to places remote... why court disaster? Surely the trailer is insured? If so, why not file a claim, get it inspected, and see what is discovered?

Bottom line, before they're out somewhere trying to enjoy their TT on an adventure, now's the time to prepare. I've never had a TT do what you're describing, so something is off.
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Old 08-08-2023, 11:52 AM   #3
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Definitely doesn't sound right. Most aluminum siding is put on from the top down, with staple on the bottom lip of the top sheet that is covered up by the next lower sheet, which fits in to a groove on the top sheet. I would bet somebody forgot the staples, or unfortunately a worse scenario would be water damage caused the underlying wood to rot or the staples to rust, so they aren't attached any more. I would definitely check things out closely. You would hate to lose a sheet of siding while going down the road!
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Old 08-08-2023, 11:57 AM   #4
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Aluminum panels for travel trailers are installed on the sides from the top down. The top piece is secured along the top edge and along the bottom edge. The bottom of each panel has what I believe is called an inverted Pittsburg seam - pocket. The top of each additional panel slides into this pocket and the bottom of the panel is secured to each stud in the wall. I'd guess that the bottom of a panel is no longer secured, allowing the panel below it to bellow out while driving. Someone will probably have to remove panels from the bottom up to find what the problem is.

Never mind. Spent too much time away from the laptop and didn't see jergle's response before posting.
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Old 08-09-2023, 09:03 AM   #5
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Fasteners have come loose.
Billowing caused by the Bernoulli Effect.
Won’t get better, probably worse.
Will have to be taken apart, or add screws to the outside.
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