3/4" is about right if there's no drip edge, otherwise 1/2". But this is nothing compared to what was previously discussed. The roofer figures his knowledge of roofing exceeds your own by a great enough margin that he can simply bluff his way right through you. Stand your ground.
source https://www.inspectorsjournal.com/topic/19268-arcitectural-shingles-along-rake/?do=findComment&comment=178362
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