Originally Posted by Torii
Mine was pretty much identical to that with slightly less over-hang of the Channel. That extra flashing was on mine also - not sure of it's purpose. I simply slid the new plywood in and buttoned things back up the way they were.
Note that it will be more difficult to slide the plywood into the channel than it was to remove. The weight of the shell will close the channel opening slightly and pinch the plywood.
I had never heard that about a squeeze or partial collapse of the "Y" channel. That could spell big trouble for insertion of new flooring.
Even if the edge was routed to a slight chamfer it wouldn't slide all the way back into the channel. And there is no feasable way to hold it open either.
Shim spacers would be in the way. Pretty scary.
It actually appears that the open side of the "Y" lower pocket is a bit larger than the back (leg) side. This could be to allow a bit of squeeze closure.
Although I would be surprised if the Airstream "engineers" thought that far ahead of time. Not sure they were concerned with floor replacement 40 years down the line.
I hope you are mistaken, and maybe had a hair thicker plywood.
Plywood thickness dimensions are so confusing and I am not sure micrometer accurate.
Can I assume that mystery flashing is folded back under the bottom of the "Y" channel?
Cannot think of its purpose.