Fiberglass insulation?

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olskool53

Member
Oct 5, 2008
41
CT
Just wondering how safe it is to pack fiberglass insulation around the liner? Neighbor swears by it as a block off plate but at 5-600 deg liner temps I'm not so sure how safe that is?
 
Fiberglass itself won't burn. There are other additives in it that can give off odors at very high temps (like in the event of a chimney fire).

MANY people use fiberglass for just this purpose even though there are other materials such as rock wool and koa wool that may be considered the preferred materials for the job.

pen
 
pen said:
Fiberglass itself won't burn. There are other additives in it that can give off odors at very high temps (like in the event of a chimney fire).

MANY people use fiberglass for just this purpose even though there are other materials such as rock wool and koa wool that may be considered the preferred materials for the job.

pen

+1. Take the Kraft facing off & you're good to go.
 
In order to pull it into fibers, fiberglass must remain liquid.
To be kept in this state, the required temperature is 2500 degrees F.
If you get your liner THAT hot, you're in deep serious...
In most homeowner applications, fiberglass WILL NOT MELT.
 
I realize that we are talking about liners, not Class A pipe. But just a reminder--do *not* let any type of insulation within Class A pipe's 2" clearance requirement--the pipe itself could overheat and fail.
 
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