Metal roof over existing asphalt shingle questions

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Old 12-03-19, 09:44 AM
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Metal roof over existing asphalt shingle questions

I have an 1880s era farmhouse that sits back in the woods-I can't see any other homes and they can't see me so we're not worried about how our house "fits with the neighborhood." The house underwent a major renovation/addition in 1998 which added a lot of space to the second floor. Most of the roof is new construction with 2x8 rafters. There is one section of the house that is older but not original-I believe it was added in the 1920s that has 2x6 rafters and a shallower pitched gable. In 1998 all of the old roofing was torn off of that section, the new roof deck was tied in, and new 30 year three tab shingles were applied to the entire roof, so there is only one layer of roofing. These shingles are now in the last third of their life so we are looking toward going over them with steel. This is the basic idea I was looking to follow:

https://www.youtube.com/watch?v=Vu7BDICl3Ao

Granted this was done on a mobile home but the same principles would apply-furring strips screwed directly into the rafters and then metal roofing right on top of that. I wouldn't bother with any insulation the way they did as my attic is very well insulated already. I'd like to hear from others who have done it this way, what to look out for, etc...
 
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