Chimney Drips when Fire is Lit

pjq

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We have added a 1 story extension at the back of our 2 story house . A new chimney rises from the extension roof , clings to the outside of the old house walls and then stands on its own so that it is the same hight as the old chimney. We have installed a wood burning stove with a straight 1.5m enamel flue inserted into the new chimney , the flue is topped with a metal "funnel" so that the flue fits snugly ( but not sealed) into the chimney liner .
We noticed a few times that brown water drips down the chimney onto the stove for about 15 mins when the stove is first lit .
We have not stuffed rock wool around the flue as we want to see that all is working well before we stuff it and put tiles above the stove . Fire and draft are very good.
What is this water running down the inside of the chimney , condensation ? What to do , it smells sooty so we dont want it to seep into the rock wool that will eventually seal the flue inside the liners .
pjq
 
Sounds like the diameter of your flue is too big.This will lead to condensation in the flue.
 
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