There are two reasons for water getting behind the gutter.
Proper gutter and drip edge installation.
Through the screw mounting hole in each bracket drill a 3 16 inch diameter hole in the front edge of the gutter.
The roofer installed the drip edge tight against the fascia.
A gutter apron is used where shingles are not far enough from the edge of the gutter.
Rain gutter installation can be a tricky job and a lot of.
The whole purpose is to direct the water into the gutters.
One of the reasons is that your shingles may be too short.
Gently lift up the shingles on the edge of the roof and locate the nails holding the existing drip edge onto.
A gutter apron is installed on the corners above roof decking.
Make sure the drip edge coming from the shingle is bending against the fascia board because when it rains it s going.
If it doesn t pull the drip edge out slightly from under the shingles.
It can be done.
Once free slide the drip edge out and discard.
How to install a drip edge.
It should never be installed outside the gutter i e against the fascia board.
Rotate the gutter upward until its back edge slips into the hooks at the top of the back of the brackets as shown.
Use a flat pry bar and hammer to pry the nails out of the drip edge gently.
This works out correctly if you do the eaves first.
The best practice is to always install the drip edge so that it is inside the gutter.
While on the other hand a drip edge is installed to the trim and usually hangs directly behind the back of the gutter.
For proper water drainage the drip edge on the rakes should always overlap the drip edge on the eaves.
Lay the gutter into the brackets that you ve lag screwed to the fascia.
Make sure the outer edge extends over the gutter.
It is put under the shingles of an attic to flow water directly into the gutter.
Secure the drip edge with roofing cement.