Some roofing contractors will not reflash the chimney unless it is specified in the contract. It is time consuming work and takes a high degree of skill to flash a chimney properly.
A favorite line to get out of reflashing the chimney is, “Why fix something that ain’t broke?”
The truth is that if the chimney is not reflashed when the roof is installed, the chances of the chimney leaking in the next 3-5 years are very high!
If you’re going to make the investment of getting a new roof system installed on your home, ensure that the system will keep you dry for years down the road. Make sure that the contractor is specifying that the chimney will definitely be reflashed!