#1 metal has a 40 year Energy Star approved warranty which guarantees against fading to keep your roof looking new.
#2 metal or secondary has no warranty and although it looks good when first applied it has a greater chance of becoming dull, and also where it is cut and at the edges of the panel it is prone to edge rust quickly.

Standing seam roofing has a Trinar paint which is a superior paint all fasteners are hidden underneat the surface for a smoother, more apealing look.

If you peer the look of shingles, metal shingles last significantly longer than traditional asphalt shingles with a variety of styles and colors.

26 ga. is a bit heavier than 29 ga. and therefore more resistant to hail and other types of damage.

Without proper ventilation your roof will "sweat", causing moisture to form and possibly damage decking or lathing or in the worst scenario cause damage to the interior of a home.

If metal is exposed ot standing water for a prolonged period of time it is possible for the paint to begin to bubble then peel thus causing the metal underneath to begin to rust.

Cutting metal roofing with a power saw, even with the blade turned backwards, heats up and sears the protective coating on the cut edge thus allowing rust to begin.

The best way to cut metal roofing is with an approved set of metal cutting shears. There are many types available including hand snips and power shears.

Weather changes from hot to cold and metal roofing expands and contracts accordingly. This will case the metal to rub against the gravelly surface of the shingle, eventually wearing away the paint on the underside of the panel allowing rust to form and after time rust a hole through the metal panel.

Treated lumber contains a chemical to "wolmanize" the wood which is corrosive to metal products.

Galvalume is a term used ot describe the coating on bare steel which contains 45% galvanized and 55% aluminum thus helping to prevent rust and maintaining a strong yet light panel.

Yes you can. Using an untreated wood 1x4 lathe would be fine. The only thign to keep in mind is that the metal can look a little rough and if while installing the metal you should step on a lathe it can crease the metal but all things considered it does work.