Just demo'd a house with slate roofing nailed down with copper nails. Roof
90 years old, hemlock struts under like new. Lead valleys like new.
This roof would have lasted another hundred years easy if the new devel did
not necessitate leveling it. Amazing to see workmanship and materials so
great even time can't destroy it.
"yourname" wrote in message
news:JzDqf.2154$JP1.1676@trndny03...

The New Hampshire/Vermont slates are said to be very long lasting slates.

I dunno that the slates actually ever die, just the nails rot away. Or the
house burns out from under them[slate was so popular on balloon frames]

Bet a slate roof with stainless nails would last ferrrever