Look for cracked rubber around the plumbing pipe.
Rubber roof meets brick.
Newer vent flashings are a concern of mine.
To install the roof wall flashing above the builder bent the top edge of the flashing into a 90 degree lip about 2 cm in width.
That lip is then set into a reglet or groove in this case cut into the mortar joint of the brick wall above.
It is commonly used in two story and side split houses.
Many of these incorporate a rubber seal with an aluminum flashing.
It is used to seal the gap between walls and intersecting roofs.
The rubber can fail in as little as 10 to 15 years.
The flashing should dive up and under the shingles that extend up roof from the middle of the plumbing vent.
Metal roof flashing can be use to seal gaps between roof walls.
It comes in 10 foot lengths or for step flashing 6 inch lengths.
Metal roof flashing is a galvanized sheet metal bent at right angles with about eight to 12 inches on each side of the angle.
Flashing detail where roof meets upper wall scott wilson posted in general questions on march 8 2019 09 53pm i have seen several images from siding manufacturers showing their siding installed so that the bottom edge is tight against the top of an adjoining roof pic 1.
Metal roof flashing is a galvanized sheet metal that is bent at a 90 degree angle about 8 to 12 inches on each side of the angle.