I have a chimney question I need to throw out for the experts here because I'm stumped.
In 1981 I put our chimney in the house. Its a Stainless double wall insulated 8". When we built the house we were in the middle of ag fields, no trees. I used the formulas for height over roof line and things worked fine all those years. Now the trees are 30 feet higher than the house, you guessed it, constant down draft from the low pressure they create in relation to the top of the roof line. I need to add on a two foot section which I know would help. All the old stove shops in this part of the state are gone. What Menards, Home Depot, Lowes are selling has a different pitch of threads for the sections to screw together. I tried, they are not even close. I know I purchased all the chimney parts at Menard's and if my feeble old memory is half way close it was JAX Brand. Probably Canadian. Any older chimney experts here that can get me pointed in the right direction. Its hopeless here as the younger retail folks aren't into wood burning and don't have a clue when I ask them. Thanks in Advance everyone.