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Post Info TOPIC: I Am Stumped


SoftWash Systems Certified Applicator

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I Am Stumped
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Please see picture attached. This is limestone on a school and i have tried everything to get the black streaks out. i have tried 12% sh with a little green wash. I have tried 4000 psi which only started to take the surface off. I have tried other asids and gutter cleaner. it looks like its black algae but just wont come out. i have let the solutions sit over night after several application and still results are the same. Any idea of what would work  

 

 

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Josh Scavetta

Safe Roof Cleaning 

SaferoofcleaningLLC.com

860-810-0019  




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maybe try one restore by eco chem. Have you tried hot water

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SoftWash Systems Pro Staff

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Josh, limestone is a porous stone that needs care not to use the wrong chemical (no acids) or to much pressure.  For Limestone cleaning it is recommended not to exceed 900 psi because limestone can be damaged at pressures above this pressure.  As far as chemicals, limestone can be cleaned by the SH/Green Wash mix if the stain is organic in nature but since you already tried this approach I have heard of another stain removing technique using a "poultice."    It should be noted that I have never performed this technique but wanted to give you an option to look into. Your local hardware store should sell a poultice cleaning solution for cleaning limestone surfaces.  A poultice is a powdered substance that is mixed with water and smeared over the stain.  The cleaner should come with directions.  I would definately test this out on a small area first.

 

Good Luck and let me know how it works out! 

 

 



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SoftWash Systems Certified Applicator

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yea i tried one restore and it didn't have any effect. i should had mentioned that. thanks mike ill look more into that poultice product

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Josh Scavetta

Safe Roof Cleaning 

SaferoofcleaningLLC.com

860-810-0019  




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I wonder if its from decomposed flat roofing. Seems to be darkest at the top. Maybe a company that makes that type of roofing might be able to help.

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John Smith

Indiana Soft Wash

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If it is to porous it might need to be lightly sand blasted

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Have tested a strong degreaser?

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Have you been on the roof if so what is tr covering. It looks like there is a drainage issue up there and the stains could be from the covering as water sheds off. I'd think about trying a enzyme based degreaser that will eat hydrocarbons like what you'd use on a garage floor to eat oil stains. Hope it helps.

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SoftWash Systems Certified Applicator

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looks like roof bleeding. Is there an oil based roof on top, like tar? try gasoline and a sponge, or an oil emulsifier of some sort....

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Ryan Freidline
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What ever happend to this job .did you get the stain out and what did you use.thanks

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