It appears a roof valley ends at the rainwater collector box tight against the side wall of the house.
Roof leaking where porch meets house.
This is key to prevent future leakage.
In the photo you can still see signs of an ice dam.
An ice dam occurs when snow melts and the water freezes when it hits the colder edges of your roof.
That is the only way.
If you have problems with your porch roof leaking it is often due to poorly installed flashing or a lack of flashing altogether.
If the roof is longer than ten feet where it butts up against the house two or more pieces of flashing are overlapped and soldered to make one large continuous flashing.
Leak detection may go easier with these tips for locating a water leak and roof leak repair.
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This roof leaks during the snowy part of winter and during storms in the summer certainly due to poor flashing.
How to fix a damaged or missing shingle roof leaks.
Let the cement dry before putting the second layer of roofing cement on the joint.
Four inches of the metal laps over the shingles and the remaining four inches extends up the wall.
Finding a leak can be frustrating or relatively simple depending on location and weather conditions.
Flashing is a thin strip of weatherproof material installed to deflect water from seals and joints to protect your porch and home from damage.
Then it is your fault and you may get jerked around for the responsibility.
A roof leak is a major nuisance for most homeowners.
Remove debris remove all debris from your roof and check to see if you have damage to your shingles.
You need to give the water some way to flow downhill.
Because the wall is some kind of solid wood metal flashing should have been installed under the shingles and up the face of the wood wall into a groove in the wood.
Of that is the case its an unwise roof design to begin with.
Anything else will just be tar on a patch job and leak.
House roof meets porch roof siding leak.
Avoid repairing roof leaks yourself.