terry wrote:

Not necessarily. Our 62 by 37 foot roof has Al. drip edge flashing,
occasionally repainted white, in good shape after 37+ years in our
close to the North Atlantic salty corrosive maritime climate.
Of more concern might be all that acid rain that blows in from the
Canadian and US mainland due to burning coal and also vehicle
exhausts!

True. I wasn't thinking of the coastal areas...

--
"Tell me what I should do, Annie."
"Stay. Here. Forever." - Life On Mars