What is this?

BaldyRookie

New Member
Dec 4, 2019
2
Mt Baldy, CA
I appreciate any help on this. Too white and loose to be creosote? We're new to wood burning stoves and just moved into a new place with a Defiant 1610 installed in a fireplace. Have gone through about two weeks of using it, and just discovered this pile of gray "rice krispies" behind the stove. I call them that because each grain is about that size with similar texture as the cereal. Crush it with your fingers and it resembles ash. We hear a raining noise every once in a while, and I assume it's more of it coming down. Ash in the bottom tray is nice and fluffy. We've stopped using it until I know what this is coming down the chimney!
 

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xman23

Minister of Fire
Oct 7, 2008
2,001
Lackawaxen PA
I'm not an insert guy, which I think is what were looking at. Is that insulation that someone filled around the chimney liner.
 

BaldyRookie

New Member
Dec 4, 2019
2
Mt Baldy, CA
It looks to me like it's fiberglass rope (like the kind used for stove door gaskets) around the liner to flat metal sheet/plate. I think rockwool is what is in the back of the fireplace brick.
 

begreen

Mooderator
Staff member
Nov 18, 2005
79,651
South Puget Sound, WA
Looks like a poorly done block off plate is leaking poured in insulation from around the liner.
 
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bholler

Chimney sweep
Staff member
Jan 14, 2014
19,451
central pa
It looks like loose fill perlite to me used to insulate the liner.