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www.familyhandyman.com/roof/installing-metal-roofing-over-shingles/view-all

Most codes now allow no more than two layers of roofing before requiring a complete tear-off. So, if your roof has two layers, it may require a complete tear-off , even though steel is lighter than asphalt. Codes vary, so call your local building department to know how to install metal roofing over shingles properly, code- wise.

www.ask.com/youtube?q=Install+Metal+Roofing+over+Asphalt+Shingles&v=fJNLTfoWJ8A
Jul 1, 2016 ... Make sure roof is square.

www.tricountymetals.com/news/2012/december/can-you-install-metal-roofing-over-shingles-

Dec 3, 2012 ... The second way to install a metal roof over a shingle roof is with the use of purlins or battens. The purlins are screwed or nailed down to the roof deck, depending on how the metal roofing manufacture has testing for their roofing panels, and then the metal is installed to the purlins. This method has its ...

www.asktoddmiller.com/articles/should-existing-asphalt-shingles-be-removed-before-a-metal-roof-is-installed

The vast majority of installations of the metal roofing systems produced by my company are over existing shingles. The low weight of metal roofing is one thing that encourages this. Steel shingles weigh about 1/4 what asphalt shingles weigh and aluminum shingles weigh about 1/8 what standard shingles weigh. I would say ...

www.unioncorrugating.com/installs-over-existing.html

Metal roofs have the best strength to weight ratio of any roofing material, allowing metal roofs to be installed over existing asphalt shingle roofs without the need to add structural support to the roof. Union's steel roofing panels weigh 50% to 65% less per square foot than most asphalt roofing shingles. Installing metal roofing ...

answers.angieslist.com/Why-leave-shingles-installing-metal-roof-q65128.aspx

The vast majority of installations I have worked with have been over existing shingles. The low weight of metal roofing is one thing that encourages this. The aluminum shingles weigh about 1/8 what asphalt shingles weigh and steel weighs about 1/4. In many cases, we are probably adding less weight back ...

www.backwoodshome.com/installing-a-steel-roof

A little reluctantly, I agreed and thus began a 15-year journey of installing more than 500 metal roofs. Since I'm getting tired, and I've made just ... One of the reasons steel roofs have become so popular is the simplicity and economy with which they can be placed over an old shingle roof. Still, despite the ease of installation, ...

www.metalpanelsinc.com/Library/MPI-roof-over-shingles.pdf

May 20, 2014 ... Metal Panels Inc. recommends three methods for installing metal roof panels on a building with existing asphalt shingles. The first method is to install battens on the existing shingles, the second method is to remove the shingles and the third method is to install the panels directly over the shingles. All three ...

www.metalroofnet.com/metal-roofing-blog/bid/85382/pros-and-cons-of-going-over-existing-roof-material

To start, there are thousands and thousands of metal roofs installed over existing composition shingles and/or wood shakes that have been problem-free for decades - and show no reason why they won't continue to perform for decades to come. However, there are a number of individual site conditions that you should look ...