Delamination on '09 Sierra

Are you sure it was lamintaed to start with?
Many trailers are laminated everywhere but the back wall so they can run a bunsh of wires through it. My Forest River Wildcat was an example.
The back wall was a bit wavy and would move if you pressed on it.

Scott

First thing is determining if the outside skin is bonded to a honeycomb structure or bonded to luan sheeting.

My 5er in sig had a small area on the side upper front corner that the filon had delamed (2' area) from the luan backing. I drill holes in the filon per service guys recommendations and injected adhesive he gave me. The trailer sat in a barn so I was able to use the side of the barn to jack a piece of plywood against the work area.

I haven't done a google/youtube on the subject but there should be lots of input on delam issues and how each job was done.

Is a small delam anything more than just cosmetic?

Todd

ScottG is correct, make sure the back wall is supposed to be glued. My Outback was loose as could be and I never noticed it until we traded it in and I was washing it to tow it in for trade-in. I just told the salesman on drop off expecting a change of agreed trade in value and was sure we would take a 2-3000 dollar hit.

The salesman told me upon inspection they appreciated our honesty but not to worry because they were never glued back there on the Outback, he said a lot of trailers were like that.

So check and make sure it is supposed to be glued/bonded back there.

Keith