please contact your local home depot store for pricing
I believe there are 10
No they are not.
should be strong enough
They can be but they are not pressure treated so they will break down over time
not really longer than 8 feet
You can always stain them with an outdoor weather proof stain.
Some type of furring strips are required if you plan to place a metal roof on top of existing shingles. Also, there are local codes allowing only 1 or 2 layers to be covered. They have plastic, wood and I have seen a pressed fiberboard. I am re-roofing with metal over one layer of 2 year old asphalt shingles atop plywood sheathing. I am using the 1 x 4 because we're subjected to severe sustained winds of 50-60 mph and have experienced 105 mph on rare occasion. I'm sure that many areas wouldn't require the additional width but I find it necessary.
I would use a 1×3 and they can cut them to fit, all or most of the home Depot stores will cut for you, I would place them about 12" apart
NO, YOU WILL LOSE 1/8 INCH PER CUT...YOU CAN STILL GET 3 BOARDS BUT THEY WILL BE ABOUT 1/8 INCH SHORTER. YOU WOULD HAVE TO BUY A 10 FOOTER AND HAVE LEFT OVER OR BUY 2_ 8 FOOTERS AND HAVE LEFT OVERS. I AM NOT FAMILIAR WITH DELIVERY IN YOUR AREA.