I know it's been a long time since this thread has been active but I've got a related question and seems like a good place to start.
My walls are made of 3/4" hemlock "Swiss Cheese" core, with 1/4" birch ply on the inside, 1/4" birch on the outside and 3mm Dibond for the outside.
If you are not familiar with Dibond it is basically a plastic sheet with very thin aluminum on both sides.
What my question is: Does anyone have experience putting Dibond on the exterior walls of their TD? I don't think that it would have the same expansion problems of plain aluminum but I also don't know if it would be better to glue with contact cement, 3M Tape or let it float.
I'm leaning toward "Float" but would appreciate some inputs before I get there.
Thanks,