Question: Does this gap need to be filled with insulation? should it be filled with insulation or can it be left as is? will insulating it make for a better draft due to the insulation and keeping that horizontal run warmer longer?
Objective: My first objective is safety. Second objective is to have a good draft since I could not insulate the entire liner due to the original clay limiting space availability to insulate the liner with the 1/2 insulation. The original clay was in good condition. My after thought was insulating the liner from the wall adapter inside the home all the way up to the tee.
What is your opinion? thank you for reading and commenting