Dear Oilman,
Thanks for your reply.
I'm going to try pushing insulation ( rockwool ? ) up around the liner with a chimney rod set and hope that will help.
Do you actually know of this thumping happening to someone with a liner ?
Thank you
Henry.
Hello,
Forgive this rambling question, I seem to need to give so much info to avoid confusion.
Last year I had a chimney and liner fitted for my new wood stove.
The liner is held in by a cowl that straps to the chimney pot and to the top of the liner.
I began to noticed a slight...