Roof Stains caused by fuel oil dye?

[jff6791]

I had a new roof installed on my house several years ago and the Class A chimney for the boiler was replaced shortly thereafter since it was not up to code (too short and inadequate clearance to operating window). The light gray shingles on the downslope side of the chimney now have brown tinted stains and the contractor blames the dye in the heating oil Has anyone else run into this and found a way to remove the stains without damaging shingles?

[STEVEusaPA]

i say no way, but post a pic. It's more likely condensing by the time it gets to the top. After the chimney was replaced, they shouldve done a combustion test. What was the draft at the breach, and the net stack temperature?
Also, take a pic farther back showing chimney and surroundings.
And if you want more advice, please post all the info about your heating unit, including nozzle size and combustion numbers.

[HeyBob]

I am thinking now way it's the dye, just a mis-adjusted burner.

[mechanical'al]

never seen brown die in fuel oil
could be rust stains from the flashing,pipe,collar or cap

[jff6791]

Thanks for the replies. Attached is a close up photo. I'll try to get some from further back today when I get home. The boiler is three year old Weil Mclain with Beckett burner. They did a tune up last month so will post specs from that report also. Also - the dye used here in Northeast is red in color.

[qwerty hvac]

Thanks for the replies. Attached is a close up photo. I'll try to get some from further back today when I get home. The boiler is three year old Weil Mclain with Beckett burner. They did a tune up last month so will post specs from that report also. Also - the dye used here in Northeast is red in color.

That looks like rust from the flashing to me.


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[mechanical'al]

ya I know its red (not rust brown) I called this one before the pic's

[mechanical'al]

the roofer (or who ever changed the stack ) sure didnt do you any favors by leaving a custom made flashing in play
buy the way you could probly get away with liquid taring it to stop that fom proceeding to a roof leak

[motoguy128]

the roofer (or who ever changed the stack ) sure didnt do you any favors by leaving a custom made flashing in play
buy the way you could probly get away with liquid taring it to stop that fom proceeding to a roof leak

I'd say have the roofer come back and use heavy aluminum flashing instead of galvanized. The roofer was CHA.

[jff6791]

The previous photo was actually the old chimney - these pictures show the replacement. I'd agree with the flashing explanation if the stained area was confined to area down to roofline. It extends further out however suggesting a source from higher up. These are the numbers from boiler tune up a month ago:
Weil Mclain WTGO-7
Gross Stack Temp 460
Net Stack Temp 400
CO2 % 12
Smoke 0
Breech Draft .04
Overfire Draft .01
Efficiency 85%
Nozzle 200
Angle 60
Spray ES

[beenthere]

If its coming from the oil/dye, it should be on the snow also.

[mechanical'al]

its not the die why isnt it stained above the stack or on the opiste side only where water would run off downward fan out????
was the old roof a complete tear off ???

[jff6791]

its not the die why isnt it stained above the stack or on the opiste side only where water would run off downward fan out????
was the old roof a complete tear off ???

Yes - previous was removed. Valid point on upslope side of stack - little or no stains showing there. As far as snow - just got it a few days ago and little to none last winter - 10 inches total maybe.