One of the biggest problems with having a chimney is the high risk of the leaking of poisonous gases and fumes.

Many conditions can cause this issue; the most common one is inadequate or improperly installed flashing, which is a piece of metal that joins the stack and roof together.

In most cases, improper installation does not allow the flashing to properly adhere to the chimney causing water to get come to the gap.

A leak can also be caused by a crack on the roof itself, creating a passageway for water to get through the brick. Chimneys that are constructed using concrete can also have crevices that fill with water over time and allow water to seep through the material.