That is 6400 square feet. You need 1 square for every 100 square feet. So, 64 squares IF you used 100% of the plywood.
30x30 = 900 sq. ft. 1 sheet of plywood is 32 sq. ft. 900/32 is 28.125 sheets. Figure 30 sheets.
Roofing shingles weight between 200 & 250 lbs per square. 1 square = 3 bundles. So if you know how many square of shingles are on a house, you will know about how much the roofing debris will weigh.
Each bundle of rooring shingles covers about 33 sq ft. 480 / 33 = 14.54545 bundles. so you need to buy 15 bundles of shingles.
How much dose 3 square of roofing cover
For a or 15o0 sq. feet home and 2 story it is about for $7,500. Plus, if any of the plywood underneath is damaged, that's another $48.00 per sheet.
Of course solar-panel roofing would be the greenest option. But there are lots of alternatives to conventional shingles that are much more efficient. Clay or slate, metal, and recycled shingles last longer and are more efficient. So are shingles with a reflective coating.
When asphalt shingles were first used, it was done all the time. The problem is that the shingles will not lay flat which give the roof an uneven appearance and makes them much easier to puncture by walking on them or with hail. No one does this anymore, strip off the cedar and put plywood or OSB over the space sheathing. More work and expense, but worth it in the long run.
Perhaps, but not guaranteed. Tile is generally much heavier than asphalt or "composition" shingles. If you're concerned, have a roofing contractor to evaluate your roof.
It depends on what type of roofing you are talking about. Are you talking about wood shake shinlges ?
Copper roofing shingles last much longer than regular shingles and are aesthetically pleasing. If you like the look of a copper roof and want to save money in the long run, you should install a copper roof.
In roofing terminology, a "square" is 100 square feet; of 9.29 square meters.
3 square feet