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