The roof 12 includes {HEAD ~ a metal roof panel} 14 which is connected with longitudinally extending metal structural members or purlins 16 by {TAIL ~ suitable fasteners} 18 
is connected by
The roof 12 includes { HEAD ~ a metal roof panel } 14 which is connected with longitudinally extending metal structural members or purlins 16 by { TAIL ~ suitable fasteners } 18
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH