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Old 05-30-2012, 07:19 PM   #1
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How to insulate a concrete block chimney


I have a concrete block chimney which passes between a bedroom wall and the garage. I have insulated the wall except where the chimney is, but the wall still seems cold. I want to insulate the chimney which doesn't get very hot, and want to make sure I do it safely and to code. I live in Maryland. Thanks for any suggestions!

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Old 05-30-2012, 07:26 PM   #2
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How to insulate a concrete block chimney


code requires a 2' air space from combustible materials. I use injection foam which is fire resistant and not a combustible product. Best approach is to leave the required air space and insulate with Thermax foam board on the outside.

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Old 05-30-2012, 08:02 PM   #3
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How to insulate a concrete block chimney


In my neck of the woods we use Rock Wool insulation for fireproofing. Its also required between a chimney when the chinnmey is inside a home penetrates another floor where the box framing around that chimney is a fire chase IE Rock Wool stuffed against the chimney and wood framing stops a fire chase.

http://guide.rockwool.co.uk/products...r-systems.aspx

It also is directly applied to the Chimney with no airspace

Should pass code in your area double check

Rock wool does pass the NFPA code ( National Fire Protection Agency..)
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Old 05-31-2012, 04:13 AM   #4
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How to insulate a concrete block chimney


Quote:
Originally Posted by 21boat View Post
In my neck of the woods we use Rock Wool insulation for fireproofing. Its also required between a chimney when the chinnmey is inside a home penetrates another floor where the box framing around that chimney is a fire chase IE Rock Wool stuffed against the chimney and wood framing stops a fire chase.

http://guide.rockwool.co.uk/products...r-systems.aspx

It also is directly applied to the Chimney with no airspace

Should pass code in your area double check

Rock wool does pass the NFPA code ( National Fire Protection Agency..)
this is true, I use it to seal the air leakage at the top plate all the time, but the unit may call for a 2" air space. This area is needed by design and should not be filled with insulation.
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Old 05-31-2012, 12:00 PM   #5
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How to insulate a concrete block chimney


Yep, I agree with Bob- you need the air space; http://www.rumford.com/code/article.html

The location sounds like it may be only used for a gas flue in the garage, or is it a bedroom fireplace? Did you ask your local AHJ?

Current Code: http://publicecodes.citation.com/ico...001_par025.htm

Support fire-blocking material, not just stuff-it in: http://publicecodes.citation.com/ico...001_par026.htm

Gary
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Old 06-01-2012, 10:36 PM   #6
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How to insulate a concrete block chimney


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Originally Posted by GBR in WA View Post
Yep, I agree with Bob- you need the air space; http://www.rumford.com/code/article.html

The location sounds like it may be only used for a gas flue in the garage, or is it a bedroom fireplace? Did you ask your local AHJ?

Current Code: http://publicecodes.citation.com/ico...001_par025.htm

Support fire-blocking material, not just stuff-it in: http://publicecodes.citation.com/ico...001_par026.htm

Gary
My posted web site is a NON-combustible material that means the 1” or 2’ to a ‘Combustible is not an issue any more. I am a mason and let me say Chimney block is NOT a “Unit” and those Chimney block can also have insulation in them and are manufactured as such. Also the Rock Wool I suggested is used for a FIRE barrier and we used a ton of that in a Hospital I worked on for soundproofing and Fire stopping. It’s a NON-combustible.

To have an air space is a trade off . For fire to exist you need 3 things Heat, Fuel. Oxygen, A 1” or 2” can also become a fire chase. But the powers to be decided that trade off was acceptable. BUT. Cant transfer fire through a NON Combustible..

Many times I deal with Fire chases. Example a PVC pipe going through a floor in a multi dwelling is considered a fire chase. Metal/iron pipe has to be used along with fire proof caulking around that penetration..

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