SmilinJack,
One of the seams on the roof has separtated, and I need to repair it. About 6 to 8 inches long. Should I pop rivet it before I seal it?
Argh. Pain.
* Rolled, crinkled seam that runs the width of the trailer?
*Or seam that runs along the length of the trailer where the roof curves down to the wall?
First, check your wall structure. Are metal uprights (studs, ribs) metal fatigued above or below welds or in the middle?
If the separated seam is along the trailer's width, I would patch it with metal sheet of the same gauge using a heavy bead of butyl caulk in the tube (not the tape) and then pop rivet it every 3 inches and around the pre-drilled holes for rivets. If it's a sheet steel roof, use sheet steel; aluminum for aluminum. Same for rivets: steel for steel and aluminum for aluminum. (Corrosion results where dissimilar metals touch.) I would anticipate more problems along the same seam, so I would make the sheet metal patch run the entire length of the seam. If it's really bad, I would use a stacked patch where the bottom one is 8 inches wide, centered on the tear. The second is 4 inches wide, centered on the tear.
If the separated seam is along the length of the trailer where the roof curves down to the wall, call the factory and ask where to take it to get it fixed / welded / rebuilt.
Watch for future stress tears.
Because of this problem, I would advise putting some structure in that curve of the fibergalss cap now. Steel or aluminum tube or even a 2x4 that you tie in with metal strap on the ends to the side walls.
Basically, the fiberglass cap is non-structural, so you have a box with a gaping hole where a strong, solid metal edge should be.....and it's bouncing down the road. That puts stresses on the sides and the roof. (The floor is more solid than the sides or top of the box.)
Lastly, it looks like the ceiling paneling you've got is just inserts between the ribs. Is that correct? If so, paneling the ceiling with sheets of plywood that tie ribs together will add some more structural integrity so that the stresses are less on the roof metal. With the paneled rear door(s) cinched shut, if the interior walls are paneled, the weakest side of the box is the unpaneled roof and its fiberglass front cap.
Good?
Prem
My goal...
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...is to live in a trailer.