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First, using metal roofing material as siding is a perfectly acceptable practice. The common galvanized corrugated metal roofing panels and also aluminum panels do need some special considerations for this shed application though. … Also, stainless steel fasteners should be used rather than galvanized nails or screws.
Metal roofing can be installed over top of shingles. One of the major advantages of metal roofing is that it is very lightweight. This makes it a perfect material to be installed right on top of an existing shingle roof.
McElroy Metal has introduced a quick and efficient method for installing standing seam metal roofing, directly over asphalt shingles, without a tear-off.
A moderate sized home in an area which is not experiencing adverse weather can be installed in a few days. Larger homes and severe weather that presents a danger to roofers can extend installation time to a week or more.
If you do have a dry attic with easy access and evenly-spaced joists, the cheapest and simplest way to insulate it is between the joists, with rolls of blanket roof insulation. This can be made of mineral wool, glass fibre or recycled materials.