Old Chimney (DOB code)
I want to make two of my old chimneys up to code and I am trying to find information. Anybody knows the exact DOB requirements regarding old fireplaces, regarding the clearances to combustibles under the hearth and hearth extension and where the chimney passes through floors and the roof. Is it necessary to add mass…
I want to make two of my old chimneys up to code and I am trying to find information. Anybody knows the exact DOB requirements regarding old fireplaces, regarding the clearances to combustibles under the hearth and hearth extension and where the chimney passes through floors and the roof.
Is it necessary to add mass and insulation by filling around the 8″ stainless steel flue liner with some insulating concrete?
The building is a typical late 19th century brownstone.
It is required if the lining manufacturer or installer states the liner is to be insulated. Insulation helps prevent condensation on the liner walls particularly when the chimney walls are exposed to the outside air. It also provides a thermal break when there is additional 1-2″ air space between the insulation and any combustible materials. In cases where you intend to create very high temperatures and maintain them, such as when building an oven it is advisable to use a lot of insulation. If you own a home and wish to have a Fire place for ambiance and are concerned about overheating, Then I advise against insulating unless it is required. There is something to be said for a fire place that cools quickly in this case.
Consult Andre Buchanan at A&A Chimneys. He advertises on this site. Good guy.
Chimney regulations in the old code are in section C26-703.20