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Old_school (Old_school)
Senior Member
Username: Old_school

Post Number: 1099
Registered: 01-2009
Posted on Monday, March 30, 2015 - 05:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

I sure it will work, but those posts are from 4 years ago. Problem solved by now I hope.
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Liberty_softwash (Liberty_softwash)
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Username: Liberty_softwash

Post Number: 2
Registered: 03-2015
Posted on Saturday, March 28, 2015 - 10:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

We use a Product called F9 rust remover and clean these slate roofs using a soft washing method.
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Sethr (Sethr)
New member
Username: Sethr

Post Number: 3
Registered: 03-2015
Posted on Saturday, March 28, 2015 - 11:44 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Do these dust stains come out easily? What was the result?
I have an identical situation on my roof, right below where two pipes were re-flashed...
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Olde_mohawk_masonry__historic_restoration (Olde_mohawk_masonry__historic_restoration)
Senior Member
Username: Olde_mohawk_masonry__historic_restoration

Post Number: 152
Registered: 04-2007
Posted on Friday, April 22, 2011 - 10:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

It's a dust stain, for sure. What color chalk do your guys carry in their chalk boxes? Orange or red, I'm guessing.
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Old_school (Old_school)
Senior Member
Username: Old_school

Post Number: 615
Registered: 01-2009
Posted on Wednesday, April 20, 2011 - 06:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Good one Liam!
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Slate_man (Slate_man)
Senior Member
Username: Slate_man

Post Number: 649
Registered: 01-2007
Posted on Wednesday, April 20, 2011 - 09:35 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

What about pollen from the trees!
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China_ad_slate (China_ad_slate)
Junior Member
Username: China_ad_slate

Post Number: 16
Registered: 01-2011
Posted on Friday, April 15, 2011 - 02:52 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Maybe Iron content is high. Thus the slate exposed to the air is easy to rust.
Nancy Rao
Shanghai AD slate Co., Ltd
ASTM-S1/EN12326 T1 S1 A1
Roofing slate manufacturer.
WEB: www.cnslate.com
TEL: 86-21-61910796
FAX: 86-21-62199550
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China_ad_slate (China_ad_slate)
Junior Member
Username: China_ad_slate

Post Number: 15
Registered: 01-2011
Posted on Friday, April 15, 2011 - 02:48 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

like moldy¡¤¡¤¡¤ Never see this situation.
Nancy Rao
Shanghai AD slate Co., Ltd
ASTM-S1/EN12326 T1 S1 A1
Roofing slate manufacturer.
WEB: www.cnslate.com
TEL: 86-21-61910796
FAX: 86-21-62199550
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Old_school (Old_school)
Senior Member
Username: Old_school

Post Number: 611
Registered: 01-2009
Posted on Wednesday, April 06, 2011 - 09:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Its above the stack pipe flashing. Water runs downhill! Use a brush and some water and see if it comes off easily. Then watch for it to return. It almost looks like a heavy pollen off from a tree, but I don't see any leaves any where close.
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Barry_smith (Barry_smith)
New member
Username: Barry_smith

Post Number: 3
Registered: 12-2006
Posted on Wednesday, April 06, 2011 - 09:20 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

It happened after phase one of the job. There is more work to do, but the customer is understandably confused at my story that we didn't do this and is waiting to see how I will deal with it. I told her that will clean it up, because it isn't worth an argument.
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Epl (Epl)
Senior Member
Username: Epl

Post Number: 109
Registered: 06-2009
Posted on Wednesday, April 06, 2011 - 08:56 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

It almost appears to be an overspray of some sort. Rust would be odd since the "stain" is concentrated in just this area with no obvious metal above it.

Is this after completion of the project? I see a few broke slates there and that hip may need a little further attention.

I would try brush and water prior to anything more extreme (i.e. chemicals).
Eric P. Loema

Sales | Salvage | Procurement

P (800) 699-5695 | F (815) 547-1425

Web: www.TileandSlateSales.com | www.ClayTileRoof.com

E-mail: epl@TileandSlateSales.com | epl@ClayTileRoof.com
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Old_school (Old_school)
Senior Member
Username: Old_school

Post Number: 610
Registered: 01-2009
Posted on Tuesday, April 05, 2011 - 08:36 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Strange indeed!
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Barry_smith (Barry_smith)
New member
Username: Barry_smith

Post Number: 2
Registered: 12-2006
Posted on Tuesday, April 05, 2011 - 06:46 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

My guys worked on this roof in Pittsburgh and a week later, the customer was complaining about an "orange stain" in the area of one of the new copper pipe flashings. We finally got back there last week (3 weeks after finishing the job) and this is what we found. It is like someone hit it with a rusty spray of some kind. This is two stories up. The customer was out of town during this period, and says that no tree spraying or anything like that was ordered. My guys claim that nothing was spilled on the job, and I believe them. We will try to clean them with a stiff brush and water.
Waduya think?Mystery stain!

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