This is by far the most common way to install a metal roof.
Installing metal roofing over shingles youtube.
In this video i cover measuring the roof figuring the metal th.
This is part 1 of a 6 part video series explaining how i installed a metal roof on my house.
The low weight of metal roofing is one thing that encourages this.
3 install 1x4 purlins down over the shingles before installing the metal roof the third way to install a metal roof over shingles is by applying 1x4 purlins over the shingle roof.
As long as the plywood under the shingle roof is in good condition this way can provide many benefits.
Consult the guide for your shingle brand to determine the specific method of installation required to preserve the warranty.
Steel shingles weigh about 1 4 what asphalt shingles weigh and aluminum shingles weigh about 1 8 what standard shingles weigh.
Most metal shingles will be attached to the roof using metal shingle clips but metal roofing shingle installation can be system specific.
Make sure roof is square.