Woodstove Insert/Redoing stove pipe in to flue

[pinetop12]

My issues is with my stove pipe exitting the back of insert up into the flue. When I did my first cleaning of the chimney flue- -this is a new houxse for me-- I pulled out the insert to access the fireplace. When i pulled out the insert my stove piping bascially came apart, rust,wear , age seemed to be the case with the brittle old stove pipe.
This is my concern. Old stove pipe was in 3 pieces, forming into a L shape Approx, 15" on center of elbow out from insert, then 25" on center of elbow up into flue. Old pipe then had what i assume is fiber glass insulation surrending the stove pipe ,stuffed all around pipe to create a barrier? for smoke? from back drafting and elements or other unwanted critters ?from entering. Just my guesses. Flue seems fine after cleaning. Flue is 11x11 inchs sq. I cleaned with a new 12x12"sq. brush.
Question ,finnaly , is... should I re-fit the insert same way? With fiber glass insulation? Is there a type of fire proof insulation I should be using rather then the old ,i can use or new I could add?
Chimney and insert have had obvious use so this older style certanly worked till now. House was built in 1972.

Thanks for whatever input you have,

Wayne

 

[brooktrout]

Some people use what is called a block-off plate, which seals the area around the pipeas it goes into the chimney. I used fiberglass insulation, minus the paper backing of course. I pulled mine out this week to do some maintenance, and the fiberglass was fine.

 

[pinetop12]

Thanks for fast reply, sorry if i never got to the piont which was weather the fiber glass was safe to reuse or
to replace with same type of glass. Sounds like its a non issues and i will use some fiber glass insulation i have on hand at the house. As you say, minus the paper backing.
Thanks again.