1) Architectural conservation 2) Materials 3) Reassembly 4) Refabrication 
Anastylosis (from the Ancient Greek: αναστήλωσις, -εως; ανα, ana = `again`, and στηλόω = `to erect (a stela or building)`) is an archaeological term for a reconstruction technique whereby a ruined building or monument is restored using the original architectural elements to the greatest degree possible. It is also someti...
the practice of piecing together dismembered remains of buildings. 
noun the archeological reassembly of ruined monuments from fallen or decayed fragments (incorporating new materials when necessary)
the restoration of a ruined monument or building by reassembling fallen parts and, when necessary, incorporating new&hasp; materials.