Black roof stains from extractive bleeding

Larry Brennan

Larry Brennan

New member
Has anyone dealt with extractive bleeding or bleed through stains? There are some homes I'm about to pitch and after a closer look, I think this is what they have.
I'm just wondering if it will clean up as well as black algae or am I looking at a different ball game.
Thanx
 
I've had it happen to me only once. They shingles were REAL cheap and REAL thin. Wish I had a pic but I don't. The customer actually had to replace the Roof months later. The spots looked almost like a purple color.
 
They are asphalt shingles. The majority of the homes with it are at one end of a subdivision. No trees are close to these houses. A lot of typical black streaking on their roofs. Looks like an epedemic when you see it. Thing is, each streak has a pretty defined point that it starts from which I thought was an indication of extractive bleeding. And yes it is something that can occur on cheap shingles.
 
Test a spot

Larry Brennan said:
Has anyone dealt with extractive bleeding or bleed through stains? There are some homes I'm about to pitch and after a closer look, I think this is what they have.
I'm just wondering if it will clean up as well as black algae or am I looking at a different ball game.
Thanx
Click to expand...

Talk homeowner in doing a test area with your roof mix. I suggest applesauce or something close to it. Only then will you know if you can cure their problem. If sucessful you can confidently sale the others.
 
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