This is by far the most common way to install a metal roof.
How to install metal roofing over shingles youtube.
This is not a complete install only basic install on a bungalow i.
Otherwise you will need to remove the shingles.
However you should only install a metal roof over shingles if you have less than four layers of shingles on the roof.
In this video i cover measuring the roof figuring the metal th.
Make sure roof is square.
As long as the plywood under the shingle roof is in good condition this way can provide many benefits.
A metal roof is an alternative to a shingle covered roof but a metal roof can actually be installed over shingles.