A large part of this game relies on salvaging and svaenging to source materials, however once those materials are used, there is no way to recover them.
example is a branch barricade, when you remove it, you gain no materials back. and tents . supposedly mobile dwellings, also are totally destroyed.
It would be good to see this linked to either scavenger skill, or a new skill, with a base 20% recovery on materials, and a cap of around 80%. some structurs that should be portable, would be transferred to backpack intact (or to the salvage carry location)