Decay is a game mechanic, which helps to maintain the world clear of garbage and forgotten buildings.
Every maintenance object situated outside a claim territory looses part of their durability and disappears, when that attribute falls below zero.
Life is Fuedal: Your Own Differences[ | ]
On LiF:YO servers, it is possible to change the decay rate via the server config(world_*.xml) by updating the string <objectDecayRate>x</objectDecayRate>, where x ranges from 0 to 10.