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!
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.
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.
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.
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.
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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