Ok, you've convinced me to add a block off plate.....

[Grisu]

Would you argue the opposite for a central/interior chimney?

I have an interior chimney and put a block-off plate in. I cannot tell how much of a difference it makes since I never burned without but why heat the attic and outside? The installation takes maybe one hour and lasts 20+ years; one of the simplest energy efficiency improvements I ever made.

 

[davidmsem]

Cardboard cutout made.....

 

[mstoelton]

I don't think I'm going to do the block off plate. Going to put a blanket on the flue and put Rolex at the top to create an air barrier to the outside. I'm okay with losing a bit of heat.....I've run an open fireplace for twenty years so this will be a huge improvement.

This is a mistake you are likely to regret.

 

[davidmsem]

This is a mistake you are likely to regret.

Hello mstoelton ........I'm not sure you got the gist of the thread......I AM doing a block off plate.