Yea after Andrew they were changing things Hourly some days...This thread really shows how regional roofing is - the terminology - the methods. Down here in Miami roofers use 1 5/8" 26 ga tin caps and 11/4" ring shank nails to anchor most everything. Gotta' use ring shanks onshingles too! Miami-Dade is such a PIA. Simplex and staples were outlawed after Andrew. Never heard of some of that stuff - button caps?
Like Roofer Mike at https://www.facebook.com/pages/Roofer-Mike-Inc/337625929645476
agreed .....We only run fiberglass paper so we only need to put a few tacks in it. No wrinkles, no need to tack the heck out of it...
Don't use that cheap felt you gotta use tons of tacks or button nails.