The best practice is to always install the drip edge so that it is inside the gutter.
Gutter installation under drip edge.
Also see gutter install errors for more examples of what happens if the gutter is installed over rather than behind the drip edge.
There are two reasons for water getting behind the gutter.
The whole purpose is to direct the water into the gutters.
Does the gutter go under over or behind a drip edge.
While on the other hand a drip edge is installed to the trim and usually hangs directly behind the back of the gutter.
If it doesn t pull the drip edge out slightly from under the shingles.
See backflowing gutters for more about gutters installed on top of rather than up under the drip edge lip.
It should never be installed outside the gutter i e against the fascia board.
If the gutter is lower than the bottom edge of the drip edge install flashing behind the drip edge and over the back edge of the gutter to remove the gap.
The shingles should extend past the top flange of the drip edge.
How to install a drip edge slip the wide flat flange of the material all the way under the first course of roof shingles as illustrated.
The water should roll off these shingles and drop straight down into the gutter.
The gutter should be mounted on the face of the fascia so that its run which must be sloped towards the downspout lies below the drip edge flashing at all times.
Rain gutter installation can be a tricky job and a lot of.
If the overlap is too short fix it by placing drip edge under the first row of roof shingles and be sure that the exterior edge is reaching over the gutter.
Make sure the drip edge coming from the shingle is bending against the fascia board because when it rains it s going.
A gutter apron is used where shingles are not far enough from the edge of the gutter.
Make sure the outer edge extends over the gutter.
For proper water drainage the drip edge on the rakes should always overlap the drip edge on the eaves.
One of the reasons is that your shingles may be too short.
It is put under the shingles of an attic to flow water directly into the gutter.