Fire Hazard - what happens to chest contents and other build pieces when they are burned

I'm looking at doing a new playthrough with fire spreading mechanic on, but I have a few questions:

1. What happens when the chests are burned? Do contents survive like when the chest just gets broken? 2. What happens to the burned build pieces like furniture and workbench + upgrades? Do they essentially 'disassemble' into raw materials, or get completely destroyed turning into coal? 3. Do wards protect from things like fire arrows and other players trying to burn your stuff intentionally and unintentionally? I guess, they don't, but what if?