Greg Martin wrote:There's commercially available closed cell glass foam. It is a barrier, is insulative, is critter proof, is LONG lasting and is strong such that it can take a compressive load.
Aaron Yarbrough wrote:
I don't know if you could find masonry screws with a gasket for attaching the metal panels to the backer board.
I had to look up airlock doors to ensure you weren’t referencing space ship components (ha) and see that it’s another way- from what I understand- to refer to an entry way or vestibule. Am I picturing this right?