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Rust Stain on Asphalt Shingles

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Rust Stain on Asphalt Shingles powersdov 05-05-2008
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Posted by on May 5, 2008, 10:04 am
Does anybody know how to remove rust stains from asphalt shingles? I
have to vents that have left rust streaks running all the way down the
roof to the gutters. I have light gray shingles.

Posted by ransley on May 5, 2008, 10:24 am
On May 5, 9:04=A0am, powers...@msn.com wrote:
> Does anybody know how to remove rust stains from asphalt shingles? =A0I
> have to vents that have left rust streaks running all the way down the
> roof to the gutters. =A0I have light gray shingles.

An acid cleaner like CLR might work, I dont know if it will damage
shingles.

Posted by pipedown on May 5, 2008, 7:26 pm

> Does anybody know how to remove rust stains from asphalt shingles? I
> have to vents that have left rust streaks running all the way down the
> roof to the gutters. I have light gray shingles.

Stop the source of the rust perhaps by painting or replacing the nails (with
copper) and the stains will fade in a year or two. The rust stain is just
particles trapped on the shingle surface not actual rusting of the shingle
so a rust cleaner like CLR will have limited effect (except by virtue of the
soap it also contains). Plain old dish soap and a garden hose would be how
I would start. Don't spray too hard or the grit will come off too much and
you'll wish you had left it alone.



Posted by Boden on May 5, 2008, 8:00 pm
pipedown wrote:

>
>>Does anybody know how to remove rust stains from asphalt shingles? I
>>have to vents that have left rust streaks running all the way down the
>>roof to the gutters. I have light gray shingles.
>
>
> Stop the source of the rust perhaps by painting or replacing the nails (with
> copper) and the stains will fade in a year or two. The rust stain is just
> particles trapped on the shingle surface not actual rusting of the shingle
> so a rust cleaner like CLR will have limited effect (except by virtue of the
> soap it also contains). Plain old dish soap and a garden hose would be how
> I would start. Don't spray too hard or the grit will come off too much and
> you'll wish you had left it alone.
>
>
You can remove the rust stains easily with oxalic acid. But, first you
must eliminte the source of the rust or they will re-occur.

Posted by on May 5, 2008, 11:46 pm
> pipedown wrote:

>
> >>Does anybody know how to remove rust stains from asphalt shingles? =A0I
> >>have to vents that have left rust streaks running all the way down the
> >>roof to the gutters. =A0I have light gray shingles.
>
> > Stop the source of the rust perhaps by painting or replacing the nails (=
with
> > copper) and the stains will fade in a year or two. =A0The rust stain is =
just
> > particles trapped on the shingle surface not actual rusting of the shing=
le
> > so a rust cleaner like CLR will have limited effect (except by virtue of=
the
> > soap it also contains). =A0Plain old dish soap and a garden hose would b=
e how
> > I would start. =A0Don't spray too hard or the grit will come off too muc=
h and
> > you'll wish you had left it alone.
>
> You can remove the rust stains easily with oxalic acid. =A0But, first you
> must eliminte the source of the rust or they will re-occur.- Hide quoted t=
ext -
>
> - Show quoted text -

Thanks for the advice. I have already taken care of the rust with
some black rustoleum. Where can I buy some oxalic acid?

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