We have a rolled seam metal roof and we love it. QWe used to have a slate roof that was over 150 years old. It had been coated with pitch in the early 20th century and was a real old momms.
The rolled seam metal roof is a heavy guage metal 11 gage. Weve had it for almost 10 years and its not even showing any wear. Its still as shiny as the first day . Its a compound alloy , not copper. I didnt want copper because with acid rain , all copper roofs Ive seen leave big bluish green stains down the building sides and we are in a stone farmhouse.
The roof is attachhed by metal straps to the roof frame unerneath. There are NO NAIL holes anywhere because the tie straps are all incorporated into the roll seams. Even the lightning rods are strapped to the roll seams and the roof vents are just like a tent of the metal. Our color is a tan color and people stop all the time because its still an unusual look. Weve seen a few others bloom in our area and all these were people who stopped and asked us about it.
Metal roofs were very popular here in the 1800's and the technology has improved alot (the roll seam machines actually ride up and down the seams and bend the metal as they go along.
One drawback, beware for sticker shock. Around here a rolled seam (not a fitted plate) metal roof will cost as much as slate, and will probably last as long , maybe longer because the slates are all nailed in and the wind can physically erode the nails by making the slatess wobble slightly in the wind , causing abrasion of the nails.
Metal roofs are light on the house and are friendly to the energy budget.
Im a satisfied customer but we shopped around for a good installer and our architect did a lot of searching and we both came up with the same roof company, a bunch of very experienced artisans in metal and slate roofs.
Ive seen other jobs where the metal has not been done well and there were a few nails seen from the ground.
A rolled seam metal roof should have NO NAILS on the surface.
As far as hail, the thickness of the metal has been very durable and we get hails as big as quarters coming in from 60000 ft so the (M)x(v^2) is like a spaceship on reentry.
Not a mark on the roof. YOUR metal will have a rating for hail in your part of the country so Im not familiar with how bad your hail storms can get.
OF course, it must be said that, a metal ropof MUST get lightning protection so you dont blow our a masonary wall from a lightning hit, or start a fire from a zap in the attic.
Thats why many barns around us start blazes when theres a lightning storm, the Amish dont believe in preventive actions , so well have one or two barns with metal roofs go up every few years . After they rebuild, the bishops make a dispensation and the Farmer will get lightning rods and down lines to a good ground.
Hope this helps, If you have any other questions Ill try to anser them , but no guarantee I know more than Ive told you.
Youll love the sound of rain or hail on a metal roof, Its the most soothing sound I can think of.