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Roof won't come completely clean?
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I oringally did a test spot on this home because it was so green. The results were great, so we went ahead with the cleaning. After the cleaning you will notice the left side of the home, has a brown residue, but the right side is perfect.  I sprayed the left side a second time, and still brown residue, that isn't rinsing away?  Anyone have anything like this before? 



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Dan Cronauer

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Relax grasshopper. This will eventually rinse away with some rain. If not wait 30 days and retreat. No Worries. Also it could be a very small form of moss that does take time as well.

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It doesn't look as bad in this picture because of the sun, but it was like a green slime, across the entire shingle. It wasn't your typically moss, more of a thin film. Already retreated once.

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It will come off, or you may want to physically rinse it with a hose The Gambrel style roof really doesn't get much "rinse" pressure from the rain to help bust off the dead algae. Instead of getting pelted by rain, the water just gently sheets off of it.

They take longer to come clean.

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ive had that before on a roof.. it comes off. just spray and forget... a few days and some rain will do the trick.roof cleaning



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My take is that patience and mother nature should take care of it, one good downpour should remove the haze.

Mike's take on the roof and the angle regarding the rinse is spot on, but I find the photo interesting.

This work comes with a little self doubt sometimes. 30 days is my number for a retreat with a large area. I have seen them disappear with a few good rains when I thought I was going to have to go back. I tell clients to expect some haze for the first couple of weeks, most times we don't see it, but setting the expectation of some haze is how we never over promise and under deliver.

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It will come off brother. Even if the roof has no moss, always tell the customer not to judge the results until a good rain or 2.

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Does it have the same color stain above it on the left side? Is it green or light brown? If its light brown and on the upper left side I think I know what it may be.

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What are you thinking Pat?

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It was a green slime, now its that brown haze, I have to check how the upper left is. What are you thinking? Its been about 2 months since I cleaned this one.

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Dan Cronauer

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Dan,

Lets see how it looks after the rain today and tomorrow. I don't believe we have had enough rain to thoroughly rinse it since your 2nd treatment. We've discussed this before that the pitch of a roof plays a significant roll in the rinsing(mother nature) process and final results.

PS...I'm not doing anything this weekend so if you want me to come over and look at it I can. You can buy coffee.

Hank



-- Edited by waxman18324 on Friday 20th of July 2012 08:48:25 AM

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Got bad news here is the update? I am gonna give it one more shot of a 40% roof mix and see what happens, I took some close ups, the shingles may just be very old? Look at the first shingle under the upper roof, it is perfectly clean. These shingles are about 25 years old. I am starting to think that the browning left, may be damage done by the the moss, or algae over time? One of the photo's is the breezeway.  Remember this wasn't your typical moss or algae it was a green slime coating. 



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Dan Cronauer

"What's on your Roof?"

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282 Hemlock Terrace Mountain Top, PA 18707

 

MJ


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The shingles look bad in terms of form, good luck with the stains

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Better pictures from right over the shingles would be more helpful but it does look like alot of granuel loss. The first question at an estimate is to ask the age of the roof, remind them it would be like waxing a 20 yr old car.....it has it pings and dings. If that is granuel loss thats the best it will look.....if I was the HO I would be very happy there is improvement in app. If you get photos right above the shingles that maybe better.

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Hey guys, I always do whats in the HO best interest. If they have shingles that are beat up, I tell them to save their money and get it cleaned. This was a friend of my mine, so I wanted their roof to come out great. It is much improved, but I set the bar high. Its just still very strange why one side came really clean and the other is a little darker?

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Dan Cronauer

"What's on your Roof?"

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I think I would take a pump sprayer with100% sh and some surfacant.  Spray a small spot and see if anything happens.  If not I would say it's the shingles.



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Apex Roof Cleaning wrote:

Got bad news here is the update? I am gonna give it one more shot of a 40% roof mix and see what happens, I took some close ups, the shingles may just be very old? Look at the first shingle under the upper roof, it is perfectly clean. These shingles are about 25 years old. I am starting to think that the browning left, may be damage done by the the moss, or algae over time? One of the photo's is the breezeway.  Remember this wasn't your typical moss or algae it was a green slime coating. 


I don't see anything complicated here. Looks like it needs to be hit again with roof mix and it will come clean.

I personally couldn't wait it out to see if it will eventually come clean. I want instant results!

I'd run right over and hit it with mix, go eat lunch and check it. If it's still not clean looking, rinse it off completely with a garden hose.

I'd bet my next to last dollar that will be the end of it.



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I'm with Ray on this one. That Gambrel roof is about a 10/12 pitch and rain will not agitatate it as much as the typical asphalt roof. When you said the green slime turned brown, that mean you killed the slime/algae but the dead agae remained. Treat it one more time with your normal mix and rinse with a garden hose 15-20 minutes later. If it is blazing hot, I wouldn't let it dry. Rinse before it dries.

Moss turns white, Gloeocaspa Magma algae turns brow and I assume the green slime your talking about turns brown also.



-- Edited by Roof Cleaning Tallahassee on Wednesday 22nd of August 2012 11:14:18 AM

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I have sprayed in twice with 40%. My next move is 50 in the pump up.

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Dan Cronauer

"What's on your Roof?"

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ROOF CLEANING PENNSYLVANIA

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282 Hemlock Terrace Mountain Top, PA 18707

 



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Apex Roof Cleaning wrote:

I have sprayed in twice with 40%. My next move is 50 in the pump up.


 Twice in a row or a 2nd time after it dried?



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