John&Joey wrote:
One more shot at this.
Buy the longest pop rivets you can and use them. As they suck down they will get fat sideways looking for a bite.
:h
Did you bother to look at the OPs pix?
There is NOTHING for a pop rivet to grab, the wood has rotted and what is left is delaminated.
What the pix does not show is just how far up the sidewall the plywood has failed.. But from the pix I suspect it goes a good ways up the wall.
The OPs wooden part of the structure is pretty well weakened and really needs to consider ways to rebuild what is missing.. But sadly with fiberglass laminated to the now gone plywood it would mean having to strip back the fiberglass to make the repair properly.. Anything else short of that is simply a temporary at best "bandaid".
If the OP just wants to reattach the bottom trim, they can simply add a piece of sheet metal to cover the plywood edge to the steel frame. Then screw the trim into that additional sheet metal as I mentioned before.
Simple and effective without any need to resort to putties, epoxies, long screws or any other method which WILL eventually fail since the existing plywood left has no strength and the glue that held the plywood together is simply going to continue to degrade.
