A broad space is formed between the rib and {HEAD ~ a back plate portion} of {TAIL ~ the groove} so as to interrupt the flow of rain water running toward the interior of building frame 
of
A broad space is formed between the rib and { HEAD ~ a back plate portion } of { TAIL ~ the groove } so as to interrupt the flow of rain water running toward the interior of building frame
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH