What I have seen is stapled to the floors ceiling and covered by a
sheet of aluminum or steel with a round recess that fully covers the
pipe and is stapled to the ceiling, then fiberglass is used if called
for, by design. Did he use Pex, as Bob said Photograph everything and
call the manufacturer and follow their guidlines.
If he screwed this up there is no telling what else he totaly
botched-hacked in. Was a load calculation done? , Proper fittings?
proper spaced staples or brackets, valving, boiler size, pump, manifold,
air bleeding, etc etc etc. It is not a job for someone to learn on or