In my area lots of houses have metal roofs. They have the advantage that snow will slide off of them if the roof is pitched steeply enough. However if you do a metal roof, then you HAVE TO do some planning for that snow which WILL slide off, sometimes fairly quickly and with a lot of force. Plumbing vents, chimneys and other penetrations in the roof should be near the peak to avoid being damaged or removed by the sliding snow. Or they can be heavily reinforced and set up to split the sliding snow. You also have to plan for where the snow will fall and build up. I have seen 12 foot deep snow piles against the sides of our barn after the roof cleared. Any door on that side would have been impossible to use without a whole bunch of snow moving and that snow was usually hard as concrete after it slid off.
I built a new house about 15 years ago and wanted to put on a metal roof. The company that was doing the building wanted an extra $10k to put on a sheet metal roof, so I went with the standard 25 year 3 tab composition. It still looks great and works fine, but when I do have to reroof I plan to put on sheet metal.
I plan to install the new roof right over the composition roof, after covering the shingles with heavy tarpaper to protect the underside of the metal from the gravel in the composition shingles. I have built other buildings applying the metal directly to the tarpaper covered sheathing and have had not trouble with any of those roofs. I always use hex headed screws with neoprene gaskets and use more than I probably have to. Others may disagree, but I prefer to put the screws through the sheet metal at the high points of the metal ridges rather than in the flat areas. This takes longer screws, but it makes more sense to me, as I think it might allow the metal to move around a little as it heats up and cools down.
About 35 years ago, my Parents" house got a new painted steel roof. I pass that house almost every day, and that roof still looks great. I don"t think the people that bought the house have ever had to do a thing to the roof. It was done right when they did it, although I remember that they thought it was pretty expensive at the time.
A metal roof might be a great idea, or it might not depending on a lot of factors, including the kind of weather you have and how long you intend for the house to continue to be used. If the house has a pretty simple roof, you might consider doing it yourself. If the roof is very complex, you might do better with new composition shingles and/or having a professional do the job. Good luck!
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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