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Furnace vent staining roof

iwobill | Posted in Energy, Heating & Insulation on December 13, 2010 09:14am

I just replace my roof this fall. I’m noticing staining around the metal vent for my oil fired furnace. The metal vent is in good condition with no rust. Any idea what would cause the staining of my new roof?

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Replies

  1. calvin | Dec 13, 2010 09:28pm | #1

    Haven't heated with oil in 25 yrs

    and then I can't remember any roof staining.

    But, how about a dirty burning furnace-when you burn lamp oil in a lamp and the wick is too high, plenty of soot is produced-which coats the glass.

    How old is the furnace? and when was it serviced last?

  2. rdesigns | Dec 14, 2010 10:03am | #2

    IIncomplete combustion due to

    Incomplete combustion due to imporper air/fuel mixture may be causing soot buildup in the flue. What doesn't stick to the flue or chimney goes out the top and condenses when it mixes with cold air. Joints in the flue can also leak grimy soot.

    Have a qualified serviceman who's experienced in oil furnaces check this out. If he knows what he's doing, he will have and know how to use a combustion analyzer which has a probe that he inserts into the flue to measure excess oxygen, excess carbon monoxide, carbon dioxide, and temperature. Ask about this before you spend any money on an unqualified technician.

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