An improved insulation system is used to insulate {TAIL ~ the roof} of {HEAD ~ a metal building} 
An improved insulation system is used to insulate { TAIL ~ the roof } of { HEAD ~ a metal building }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD