One of the reasons is that your shingles may be too short.
Drip edge gutter installation.
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.
Home centers sell rolls of 6 in.
How to install a drip edge.
Secure the drip edge with roofing cement.
The best practice is to always install the drip edge so that it is inside the gutter.
Without a drip edge water may end up beneath the shingles and may cause damage to various parts of the home.
Drip edges are metal sheets usually shaped like an l installed at the edge of the roof.
Also called drip edge flashing or d metal they serve a vital function by directing water away from the fascia and into the gutter.
Raise the shingles and push the top rim of your drip edge beneath them.
This is important to protect damage to your fascia soffits rafters.
It is best to install a drip edge on a day with warm weather because it makes it easier for the shingles to be stripped back.
Make sure the outer edge extends over the gutter.
There are two reasons for water getting behind the gutter.
The whole purpose is to direct the water into the gutters.
For drip edge installation align it for directing water flow into gutter alongside the roof edges.
You can use nails to tightly secure it.
Ideally it is recommended to nail about every 12 inches.
Don t exceed it more than 16 inches.
It should never be installed outside the gutter i e against the fascia board.
Use tin snips to cut the gutter apron flashing roll in two 3 in.
With without rain gutters.
Tools supplies tin sn.
This works out correctly if you do the eaves first.
Slip the wide flat flange of the material all the way under the first course of roof shingles as illustrated.
If it doesn t pull the drip edge out slightly from under the shingles.
Make sure the drip edge coming from the shingle is bending against the fascia board because when it rains it s going.
Begin at the lower corner of the roof and gradually progress to the top.