1x12 for metal or rolled roofing, 3x12 for shingles.
Bid by the SQ. its easier, here in ny, it varies when the pitch of roof changes,walkable roofs are $25-30.per sq.Increas the pitch incresis the price. Details about bids of roofing shingles can be found here http://www.homeadditionplus.com/Bid-Sheet-Ebook-info/Asphalt-Shingle-Roofing-Bid-Sheet.htm
When you say roofing felt (or blackout paper) It usually means the felt paper used under asphalt shingles. If that's the case, a couple of inches is fine. If you're really talking roll roofing, then that's a whole different ball game.
a roofing square is 100 sf. There are formulas out there that allow you to use the pitch and outer dimensions of the roof to figure out the number of squares. If not, calculate the square footage and divide by 100 - that's the number of squares you have...
Here's a link to a web page that answers the question: http://en.allexperts.com/q/Roofing-1598/2008/8/roll-roofing-shingles-1.htm
Depends on the roofing materials. Standard shingles must be above 3/12 pitch, unless you're using a rubber membrane as the underlayment.
98677 General Liability Code (Roofing—Commercial or Residential Over Three Stories) Visit us for roofing services: Green Shield Roofing
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Roofing Companies in Chesapeake, VA: A Comprehensive Overview
There are a number of companies and contractors that specialize in corrugated roofing including: Quality Smith, Baker Roofing Co., and Gordon Mott Roofing Company.