I have installed and removed a number of metal roofs.
No longer a fan unless its standing seam.
Even then, personally I would not have another on my own home.
The typical 3 foot wide "AG" panel with a thousand holes that you hope are sealed with a neoprene washer are good for dog houses and pole barns.
In cold parts of the state, it takes several things for a metal roof to shed, above 32 temps and damn steep helps, however even a 12/12 pitch will not shed reliably unless it accumulates or warms up.
In most places of Alaska a metal roof and siding is the strongest and most economical way to go. A shingle roof would blow away the 1st fall in Bristol Bay,,I've seen it !! The gusset type style of pro-panel (the standard) is enormous and I havn't found properly torqued screws not to be a problem. I peeling off the cedar clapboard on our 20X24 and sheeting it this summer just for wind shielding alone.
