The insulation system includes {HEAD ~ insulating boards} which are suspended beneath roof panels by {TAIL ~ flexible sheets} of material 
are suspended by
The insulation system includes { HEAD ~ insulating boards } which are suspended beneath roof panels by { TAIL ~ flexible sheets } of material
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH