Reclaimed building materials are in high demand. Homes from the 1970s and older usually have excellent lumber, more often than not sourced from old-growth timber. My former home from 1949 sat on a 40-foot 12x12 solid cedar beam, for instance.
The only other stuff in the walls is either in demand (copper, plumbing metals) or we just throw it out (drywall, insulation).
So if these engineered materials are sturdy enough, I would give favorable odds to them being reclaimed.
