If the leak is dripping in the middle of the roof go to the top of the roof and check if some of the shingles are cracked.
Flashing on porch roof.
If you already have faulty flashing installed you.
Roof flashing on a porch roof there is another place that roof flashing has now invaded.
Find out if the flashing is correctly installed and sealed or if it has holes caused by corrosion.
Traditionally the flashing was installed and hidden under the siding.
Open valleys have metal flashing to protect this critical area of the roof.
Place the flashing between the joint of the house and the roof.
How to flash a porch addition 1.
The flashing on the wall should be flush against it and the porch roof portion should be on top of the shingles.
It is at the back of the porch roof where the roof meets the house siding.
The edge of the roof has thin metal flashing that helps water drip off.
How to install porch roof flashing step 1.
Try to keep the nails as flush as possible to the edges.
Put on a pair of leather palm gloves to avoid injuries from the sharp edges of the metal flashing.
Nail the flashing securely in place using roofing nails.
Cut an angle with tin snips on one side of the flashing piece from an end.
Measure the length of the porch roof joint to determine how much flashing you will need.
Lay the cut flashing down at the corner.
While some skylight manufacturers include flashing in their products sometimes roofing professionals.