Heat loss?

[Ctwoodtick]

i have a 16-17 foot masonry chimney with insert connected to wrap insulated liner. The insulation begins on liner about 16 or 17 inches up from where it connects to insert. No block off plate in damper area, just some roxul. Outside of chimney runs through garage. With IR thermometer, the “hot spot” of the outside of chimney runs at about 100 degrees. Thus area corresponds to where top of smoke chamber is. 100 degrees seems a bit high to me.
I’m wondering what temperature would exist within masonry for 100 degrees to be seen outside.
Also, are retrofitting block off plates once insert is installed feasible?

 

[Squisher]

I'm not sure what that temp would correspond to on the inside. I would only be guessing. But if 100 is the max you are seeing that is nothing to worry about. I would be curious of others thoughts on this.

I would think you definetly would want some kind of block off plate. As Begreen often mentions you don't want insulation/roxul bits falling down and being blown around your home by the insert blower. I would think it would be entirely site specific on whether you could fit a block off plate in with the insert in place or not. Certainly a two piece block off plate could be fashioned to fit around the liner. But whether it can be effectively installed or not with the insert in place? Maybe, maybe not.

 

[Poindexter]

I wouldnt want the surface of the masonry in the garage that hot. Probably not dangerous, but i do think uou could wring a bit more efficiency out of what you have.