Anytime you have a change in the surface of your roof you have a place that is vulnerable to leaking. A different roofline, chimneys, vents and even the eaves and rakes are all susceptible to water damage if not properly constructed. This includes the actual labor and materials used.
The roof continuously expands and contracts in response to the elements. This is a common occurrence to which your roof should be able to respond without damage. If you have a leak, you may have to pursue some roof flashing repair to correct the problem.
There are many areas that may need roof flashing repair to stop the unwanted leaks. The one area most familiar to homeowners is found around the chimney. This type of construction is called step flashing due to its appearance of "stepping" up the structure. This is the bright metal sheeting around the base of the chimney.
This same type of step flashing is used around dormer windows also. The purpose of this, and all flashing is to direct the flow of rainwater away from vulnerable areas. When installed correctly in a two-part system, this flashing will work with gravity to move the flow of water off the roof.
You may need roof flashing repair for the areas around the roof penetrations of pipes and vents. This is called vent pipe flashing and is also critical to redirect the flow of water. It must be properly installed and maintained to prevent water from leaking into your home in these vulnerable spots. Also, you will find flashing at the intersections of different rooflines.
Most homes have at least a few of these at the porches and decks attached to the home. This is a good tidbit to know if you are having any sort of addition built onto your home. There must be flashing added, or it will leak.
There are also flashing systems at the eaves and rakes of your home. If you have noticed water flow behind the gutters during a weather event, and you know the gutters and downspouts are clean and flowing, the problem could be with the flashing. Again, their purpose is to keep the water away from wood and underlayment to prevent damage.
Rotting fascia or soffit may indicate that you need roof flashing repair whether or not you see any flowing water. It is best to contact a professional to repair these vital roofing systems.