The best metal roof on the market today is the standing seam metal roof. They have no exposed fasteners. You use little flathead screws (Pancake head) on a little flange area. The next sheet overlaps the screws. (You actually use a rubber mallet to snap them down). They are wind rated at 140 MPH .You see them on a lot of commercial bldgs. now. They are fairly pricey. Material cost probably $1.50 -$1.80 and about $2.00 labor.I was a roofing contractor for 20 years and the only thing I would put screw down on now may be a barn or out building. The average roof probably has 5-6000 penetrations and it only takes one improperly tourqued screw to deal you misery. You roof is not only cut up it is steep as hell. Great looking house though. I hope you have a pleasent experience while building.
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