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Question DetailsAsked on 6/9/2013

what is the average pricing of metal roofing as opposed to shingles. I have two layers of shingle now that would have to be removed first.

I need to have my roof redone on a ranch home, simple roof in back and two peaks in front. Two layers of shingles on now would have to be removed to do another shingle roof. Or, I am considering a metal roof and I know that can go on top of existing shingles.

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3 Answers

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You CANNOT use shingle- metal roofing over existing shingles, so I presume you are talking standing-seam sheet roofing. While that can be installed over shingles it is not recommended practice, and many manufacturers void the warranty if it is not fully supported on sheathing, rather than strips of lath. Also, putting it over shingles introduces issues of decay of the shingles under the sheathing due to heat and humidity (from nightly condensation) over time, and you have to provide a space or padding under the sheet metal to prevent the aggregate in the asphalt shingles from scraping off the protective coating onthe underside of the metal roof as it expands and contracts with temperature changes. That can cause rust-through.

The tear-off is not that much of the cost - only about 10% of a metal roof cost, typically, plus doing the tearoff is the only way to make sure you do not have underlying sheathing damage, to correctly install flashing and metal fascia covering, etc. I would recommend doing the full tearoff.

Answered 6 years ago by LCD

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I have been involved in the production of residential metal roofing for over 30 years and tens of thousands of roof installations in all climates. Many, many of those were over the old shingles. I know of no metal roofing manufacturers that void warranties with this practice. I have never once had an installation where, down the road, I ended up saying "Wow, I wish they would have removed the old shingles." That said, every roof must be evaluated on its own merit. The low weight and design of many metal roofs encourages their installation over existing shingles. However, building codes in many areas of the country do prohibit three layers of roofing. I am happy, free of charge, to consult on individual projects. Please feel free to email details and photos of your home to me for more in depth input. My email is todd@asktoddmiller.com

Source: http://www.asktoddmiller.com

Answered 6 years ago by AskToddMiller

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I'm so sorry ... I neglected to answer your question about cost. It really depends upon the quality and of metal roof you choose and also the particulars of your roof. It can run from about the same cost as a good shingle roof to four times that cost.

Answered 6 years ago by AskToddMiller




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