The flashing on the wall should be flush against it and the porch roof portion should be on top of the shingles.
Installing flashing on porch roof.
Flash the corner first if applicable.
Install the underlayment as directed by the manufacturer then set the valley flashing on top of it.
Nail the flashing securely in place using roofing nails.
If you already have faulty flashing installed you.
Especially if you live in an area that gets a lot of snow and ice.
Put on a pair of leather palm gloves to avoid injuries from the sharp edges of the metal flashing.
How to install porch roof flashing step 1.
Before you apply the flashing you ll need to lay down a waterproof membrane.
Measure the length of the porch roof joint to determine how much flashing you will need.
Prepare the area where you will install the roof flashing.
Install the flashing place the flashing between the joint of the house and the roof.
For the valley areas of the roof you will be using valley flashing.