What causes tar in chimney?

What causes tar in chimney? What Causes It? When wood which is not thoroughly seasoned is burnt, the wood is not fully combusted. As it burns it releases quantities of steam from the moisture of the wood. The smoke and steam cool as it rises and condense out on the inside of the chimney, lining the flue with tar.

What Causes It? When wood which is not thoroughly seasoned is burnt, the wood is not fully combusted. As it burns it releases quantities of steam from the moisture of the wood. The smoke and steam cool as it rises and condense out on the inside of the chimney, lining the flue with tar.
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