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