Shingle overhang often has to be addressed most shingle manufacturers recommend a 1 4 to 3 8 inch overhang over your eave which is where your roof ends by your gutter.
How shingles overlap gutter.
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.
If you have a straight run gable roof measure from shingle to shingle and then add 1 2 inch to each side for a slight overlap.
The drip edge flashing you depicted is called t drip style or o d e which stands for overhanging drip edge.
If there s a drip edge installed where the fascia meets your shingles and the gutter is hung below the drip edge get some roll flashing and tuck it up under the drip edge and over the top of the gutter.
This will leave room for the inside box miter.
What you need to do is to extend those roof shingles into the gutter.
And you re going to slip underneath some flashing.
If you have inside corners subtract 5 inches.
Use tin snips to cut the gutter apron flashing roll in two 3 in.
See overshooting gutters just below we illustrate shingles installed with too much overhang into the gutter.
In almost every instance gutter installers take the path of least resistance and shove the gutter right underneath the roof shingles instead.
Each has their own reasoning for a slightly different amount of overhang.
In many cases and particularly as home ages and settles the roof edge at the eave edge can wave in and out by more than this amount.
In my opinion the shingles should never be exactly even with the edge of any drip edge flashing.
Measure the total run of the gutter length you need.
So because there s not a magic potion that will do that the way to fix this is to get a flat bar and that s a very thin pry bar.
Shingles hang over gutter.
To this total length add 4 more inches to the length this is for an overlap at the interior joined seam it will make the gutter stronger in that area.
For outside corners measure from corner to corner.
My gutters have a plastic mesh cover with an aluminum rail that runs the lenght of the gutter to support the mesh.
The shingles appear to have been installed such that they cover almost half of the gutter.
When it rains hard the water running down my roof will run right past the gutter and onto the ground.
