Gutters should be hung where a straight edge laying on your roof shingles can easily extend over the front lip of the gutter this is the proper installment location for the high point of the gutter.
Overhang roof to gutter.
How to cut a gooseneck downpipe.
Greater overhang becomes a point of leverage for gusts of wind to rip off your roofing.
It can be done.
In this video we demonstrate how to install a gutter for a shed metal roof or house.
Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials.
Here phil explains how much overhang a roof should have at the gutter.
The bottom tile or slate of the roof covering should project at least half way into the gutter the ideal distance is between half way and two thirds of the way over.
Gently lift up the shingles on the edge of the roof and locate the nails holding the existing drip edge onto.
Use a flat pry bar and hammer to pry the nails out of the drip edge gently.
How far into the gutter should roof tiles project.
In almost every instance gutter installers take the path of least resistance and shove the gutter right underneath the roof shingles instead.
Many installers deliberately bend down the overhang into the gutter to assure no wind blown rain goes between the overhang and the gutter effectively preventing water incursion behind the gutter.