Roof surface flashings that go around a plumbing vent pipe are what we are concerned with. These pipes are usually encased with a rubber material that is stretched around the pipe. The rest of the flashing body is usually aluminum that is hidden under the roof shingles. Normal roof shingle life in Somerset, New Jersey is about 25 years and the normal- no maintenace life of this type of roof flashing is 15 years. Hence there is a discrepancy. What happens here is the rubber flange holding the venting pipe starts to crack. Even a small crack can let a large amount of rain water inside. This leakage will be promeniently displayed by a water stain on the ceiling that you will notice when casually walking into the area of concern. No need for alarm, yet.
What is normally a typical repair is to seal the pipe and rubber bushing with roofing tar. No need to replace the enitre roof flashing. As was stated before in this article, even a small crack can let in a lot of water. These small holes/or cracks are also an easy access for flying insects to enter the house.
Here in Somerset New Jersey, stinging insects such as wasps and hornets are prone to fly around at roof elevations for the purpose of finding a safe, dry nesting area. These flying insects are out and about everyday. A vacant attic space would make for an ideal home for them but on the other hand, may create a very undesireable situation for yourself and your family as they eventually will find a way from the attic into your living space. Yikes!