I have been up to my arse in aligators with so many other repair subjects on my Excella that I have not addressed floor rot yet.
So far I have only found a small amount but there is alot more hidden floor to check out.
danesh's pictures look to me that his 1985 floor was a OSB strand chipboard.
Is that correct?
My 1974 floor is a traditional plywood .
Is there a year certain when Airstream Inc went away from traditional plywood?
Also the so-called "C-channel" or "U-channel" changed from a simple trough that held the two wall skins and the rib bottoms.
It was "improved" into the trough on top with a lip below to recieve the edge of the wooden floor (as I understand it). Sort of a lower cased cursive"y-channel"
Is there a year certain when that took place?
Also was the gauge of the channel made heavier?
Was the "improved" channel extruded aluminum?
I think the plain "U-channel" was roll-formed sheet metal (just guessing from pictures).
My guess is that the old plain "U-channel" would be easier to repair floor under.
Another question is Does the Rot-Doctor type epoxies work on OSB ? since it is already permeated with glues to hold it together?