New Roof is Staining White House


Old 05-01-14, 08:35 AM
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New Roof is Staining White House

I recently had a new roof installed. I noticed that a black colored stain is visible on the white drip cap underneath the new roof. Does this eventually go away or does it need to be wiped off?
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Old 05-01-14, 09:04 AM
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That's pretty common. A lot of houses with dark shingles and white gutters will have that sort of staining or residue. It will not eventually go away. As with anything that gets dirty, it needs to be cleaned off. The longer it has been on there the more chance there is of it becoming permanent. As your roof ages, I would guess that rainwater will eventually "wash" most of whatever is causing this stain off of your new roof, so in that respect, the problem may become less and less but that process will probably take years. In some places, stains from tree pollen can cause similar stains as rainwater rinses the pollen off the roof.

I have used Westley's Bleche-Wite (a whitewall tire cleaner) for this... sometimes Formula 409 will work. If the stains are stubborn you might need to scrub with Soft Scrub or Zud. But be warned that abrasive powders and strong cleaners can also take the paint off metal when you start putting elbow grease into it.
Old 05-01-14, 09:06 AM
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Without knowing what your roof is or how long ago it was installed it's impossible to say. I would certainly start with trying to wipe it off if it bothers you.
Old 05-01-14, 09:17 AM
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It's not likely it will go away on it's own. I've had good results using 'greased lightning', 409 and similar cleaners should also work.

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