Standard roofing nails should NEVER be used to secure a base sheet to the deck. The nails are the only thing holding the roof down, so you need a large surface area around the nail to prevent tear-through.the nails are going to depend on the area you live. you can go with regular nails but i always nail around the eves, thats where the wind get under and tears it off. i do use cap nails because ive got the gun. but i wouldnt stay awake at night worry about it.
I agree with everything except torching a SBS sheet. SBS does not torch easily because it has a very narrow application temperature. Either apply cold process SBS or torch down APP modified bitumen.1. Dont use Nails.
2. Tear it off to the deck. Most people don't replace a dry roof. I assume you are most people.
3. Inspect and repair the deck. New decking must span three supports.
4. Assuming this roof drains to a drip edge, Install 1.5 inch Perlite up to 18 inches of the edge. Install 18 inch tapered edge at drip edges.
5. Install G2 ASTM 4601-Type II Base sheet. Fasten down all to deck with 3 inch roof deck screws and metal compression plates 1 per 2 sq. feet at the perimeter 4 feet in and 1 per 4 sq. feet in the field.
6. Install Two ply SBS modified bitumen roof system. Hot mop the first smooth ply, and torch the granular cap sheet, or cold process the first, torch the cap.
Detail per MFGR. Soprema Makes a good sheet, as does Siplast.