When chimneys leak, it is usually due to the fact that the metal flashing surrounding the chimney has failed. While it’s very simple to spot telltale signs of leaking, fixing the leak itself may prove to be much more difficult. There are generally three steps to chimney flashing repair: removing the old flashing that has failed, applying a new layer of metal flashing, and finally sealing it so that it will be water proof.


The first step is removing the old flashing. This is an absolute must for proper chimney flashing repair. When the old flashing is removed, we can check whether or not the leak is localized to the area surrounding the flashing. Typically, there may be some minor damage to the underlying plywood beneath the shingles, but those can be easily fixed and a new layer of shingles placed where the old layer used to be.


Underlying structure after removing the damaged flashings

Application of new metal flashing

Once the old flashing is removed and the surrounding area checked for their integrity, we are able to proceed with installing the new metal flashing. Here at Biondo Contracting, we use primarily two types of metal flashings:

  1. Copper – the more expensive metal of the two. Copper is recommended for slate roof installations and is long lasting. Its longevity comes from the fact that copper has a very low temperature movement compared to most metals.  This helps keep the flashings sealed and causes less stress.


    An example of one of our chimney flashing installations using copper

  2. Heavy gauge aluminum – the less expensive of the two, but just as productive for chimney flashing applications. Aluminum flashing also comes in different colors to match either the color of your chimney or roof shingles.


    An example of one of our chimney flashing installations using aluminum

    Here at Biondo Contracting, we use a grinder equipped with a diamond blade to cut into the grout of the chimney. This will enable us to actually bend the Counter Flashing into the chimney, ensuring a professional application.


Once the new flashing has been installed, we then seal it with polyurethane on account of its water-resistant properties and the fact that it can stand up to intense light—allowing us to apply the sealant and know that it will last for a long time.

Before and After Photos


Before                                                                          After

A few last words

Repairing the chimney flashing is often times a very difficult process simply because of the meticulous work that must go into it. So if you don’t want to be the one that has to deal with measuring out and cutting the right-sized step flashings and base flashings, give us a call. Located in central New Jersey, Biondo Contracting has proudly provided high-quality roofing services for over twenty-eight years. Call us at (732) 257-2926 and get more information regarding chimney flashings repair.