The answer is somewhat affected by the geographical location of the roof in question. Roof sheets are normally supplied through local business suppliers of roof sheeting. For example if a buyer was based in the United Kingdom then a company called Accord Steel Cladding would be able to supply the requested materials. Alternatively you can latch onto third-party knowledge through a local builder, they would be able to source sheet roofing through their own personal contacts and suppliers.
Four sheets of 4' by 8' plywood will be required to cover a shed roof measuring 10' by 12'. Three of the sheets can be used as is, but one of the sheets will need to be cut to fit.
Approx. 113 sheets
It will take 46 3 x 8 sheets.
The purlin is the framing member the roofing sheets screw to.
Slate which is a type of stone is used for the roof tiles instead of shingles. It splits in thin sheets and is nailed to the roof the same as regular asphalt shingles.
30x30 = 900 sq. ft. 1 sheet of plywood is 32 sq. ft. 900/32 is 28.125 sheets. Figure 30 sheets.
assuming standard sheet is 4 x 8 = 32 square feet roof is 29 x 45 = 1305 sq ft you need 1305/32 = 41 sheets
You can but it is not recommended. The old roofing sheets will promote corrosion under the new sheets. Far better to remove the old corrugated roofing first.
Roof beams
There is 32 sq ft in a 4 by 8 sheet of plywood. You would need at least 21 sheets to cover the roof.
Roof beams
6