[competentone]

Contractor #4 might be the best roofer -- if he can be careless about keeping an appointment, it may mean that he is busy enough that he doesn't need any more business. He may be poor at the "business" part of doing business, but might be an excellent roofer and stays busy from word-of-mouth referrals.

You might want to give him a second call and see what he says about missing the appointment.

Do you know what the going rate is per square for roofing (and it sounds like sheathing too) in your area?

Anyone suggest/comment about ice/water shield membrane in valleys, etc.? What about drip-edge, flashing details, algae resistant shingles, weights of felt or other underlayments, plumbing stack boots, etc.?

I'd be looking for someone who pays attention to the "details" -- most roof leaks I've seen are not related to the roof itself, but some flashing detail that wasn't done right.